®
This manual pertains to instruments with serial number 6830XXX
or higher.
8062A
True-rms Multimeter
Instruction Manual
PN 609153
May 1997 Rev.1, 1/00
© 1997, 2000 Fluke Corporation, All rights reserved. Printed in U.S.A.
All product names are trademarks of their respective companies.
LIMITED WARRANTY & LIMITATION OF LIABILITY
Each Fluk e product is warrant ed to be free from def ects in material and workmanship
under normal use and s ervice. The warrant y period is one y ear and begi ns on the
date of shi pment. Part s, product repai rs and servic es are warranted for 90 days. This
warranty ex t ends only to t he ori gi nal buyer or end-user cus t om er of a Fluke authori z ed
reseller, and does not apply t o f uses, disposable batt eri es or to any product which, in
Fluke’s opinion, has been misused, al tered, neglect ed or dam aged by accident or
abnormal conditions of operation or handling. Fluke warrants that soft ware will oper-
ate subs t antially i n accordance wit h i ts functional speci fications for 90 days and t hat it
has been properly recorded on non-defecti ve media. Fluk e does not warrant that
software will be error f ree or operat e wit hout interruption.
Fluke authori zed resellers shall ext end t hi s warranty on new and unused products to
end-user cus t omers only but have no authority to extend a greater or di f ferent warranty
on behalf of Fl uk e. Warranty support is avai l abl e i f product is purchased through a
Fluke authori zed sales out l et or Buyer has pai d t he appl i cable internat i onal pri c e.
Fluke reserves the right to invoice Buyer for importation cos ts of repair/ repl acement
parts when produc t purchased in one count ry is subm i tted for repair in another coun-
try.
Fluke’s warranty obli gation is li m i ted, at Fluk e’s option, to refund of the purchase pric e,
free of charge repai r, or replacement of a defectiv e product which i s returned to a
Fluke authori zed servic e center within the warranty period.
To obtain warranty service, contact your nearest Fl uke authorized s ervice cent er or
send the produc t , with a desc ri ption of the difficulty, postage and insurance prepai d
(FOB Desti nation), to t he nearest Fluke aut hori zed servic e center. Fluk e assumes no
risk for damage in t ransit. Following warranty repair, the product will be returned t o
Buyer, transportati on prepai d (FOB Destinati on). If Fluke det erm i nes that the failure
was caus ed by misuse, alteration, accident or abnormal conditi on of operation or han-
dling, Fluke will provide an estimate of repair costs and obt ain aut horization before
commencing the work. Following repair, the produc t will be returned to the Buyer
transportat i on prepaid and t he Buyer will be billed for the repair and return transporta-
tion charges (FOB Shipping P oi nt).
THIS WARRANTY IS BUYER’S SOLE AND EXCLUSIVE REMEDY AND IS IN LIEU
OF ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT
LIMIT ED TO ANY I MPLIED WARRANTY OF M ERCHANTAB ILITY OR FITNESS FOR
A PARTICULAR PURPOSE. FLUKE SHALL NOT BE LIABLE FOR ANY SPECIAL,
INDIRECT, INCIDENTAL OR CONSEQUENTIAL DAMAGES OR LOSSES, IN-
CLUDING LOSS OF DATA, WHE T HER ARISING FROM BREACH OF WARRANTY
OR BASED ON CONTRACT, TORT, RELIANCE OR ANY OTHER THEORY.
Since s ome countries or states do not allow limi t ation of the t erm of an implied war-
ranty, or exclusi on or l i m i tation of incidental or consequential damages, the lim i tations
and exclusions of t hi s warranty may not apply to ev ery buyer. If any provis i on of this
Warranty is held invalid or unenforceable by a court of com petent jurisdi ction, s uch
holding will not affect the validity or enf orceability of any ot her prov ision.
Fluke Corporati on Fluke Europe B.V.
P.O. B ox 9090 P.O. B ox 1186
Everett, WA 98206-9090 5602 BD Eindhoven
U.S.A. The Netherlands
5/94
Safety Information
This meter has been designed and tested in accordance with IEC Publication
348. To ensure that the meter is used safely, follow all safety and operating
instructions in this manual. If the meter is not used as described in this man-
ual, the safety features of the meter might be impaired.
• Do not use the meter if the meter or test leads look damaged, or if you
suspect that the meter is not operating properly.
• Turn off power to the circuit under test before cutting, unsoldering, or
breaking the circuit. Small amounts of current can be dangerous.
• Do not apply more than 500V rms between a terminal and earth ground.
• Use caution when working above 60V dc or 30V ac rms. Such voltages
pose a shock hazard.
• When using the probes, keep your fingers behind the finger guards on
the probes.
• Disconnect the live test lead before disconnecting the common test lead.
Symbols
The following international symbols are used in this manual:
Important Safety Information in Manual
AC
DC
Diode Test
Ground
Fuse
Indicates Terminals At Which Dangerous Voltages May Exist
Battery
i
Table of Contents
Chapter Title Page
1 Introduction and Specifications ............................................ 1-1
1-1. Introduction ............................................................................. 1-3
1-2. Specifications........................................................................... 1-4
2 Operation Instructions........................................................... 2-1
2-1. Introduction ............................................................................. 2-3
2-2. Unpacking Your Instrument..................................................... 2-3
2-3. Battery Installation or Replacement......................................... 2-3
2-4. Fuse Replacement.................................................................... 2-5
2-5. Physical Features ..................................................................... 2-6
2-6. Front Panel........................................................................... 2-6
2-7. Display................................................................................. 2-8
2-8. Signal Input Limits .................................................................. 2-9
2-9. Operation ................................................................................. 2-10
2-10. Power-On Self-Test.............................................................. 2-10
2-11. AC/DC Voltage (V)............................................................. 2-11
2-12. True RMS Measurement.................................................. 2-11
2-13. AC-Coupled AC Measurements....................................... 2-12
2-14. Waveform Comparison and Conversion.......................... 2-13
2-15. High Impedance DC Voltage........................................... 2-14
2-16. AC/DC Current (A).............................................................. 2-15
2-17. Resistance (Ω)...................................................................... 2-18
2-18. Autoranging Megohms..................................................... 2-19
2-19. Autoranging Kilohms....................................................... 2-20
2-20. Diode Test (G)................................................................... 2-21
2-21. Relative (REL)..................................................................... 2-22
2-22. Continuity ( )........................................................... 2-25
2-23. Initial Check-Out Procedure.................................................... 2-25
3 Theory of Operation............................................................... 3-1
3-1. Introduction ............................................................................. 3-3
3-2. Functional Description............................................................. 3-3
3-3. Microcomputer..................................................................... 3-3
3-4. Measurement Acquisition Chip (MAC)............................... 3-5
3-5. A/D Converter Cycle............................................................ 3-5
3-6. Voltage Measurement .......................................................... 3-8
8062A
Instruction Manual
ii
3-7. Current Measurement.......................................................... 3-9
3-8. Resistance Measurement...................................................... 3-10
3-9. Continuity Measurement ..................................................... 3-11
4 Maintenance............................................................................ 4-1
4-1. Introduction............................................................................. 4-3
4-2. Service Information................................................................. 4-3
4-3. General Information ................................................................ 4-5
4-4. Handling Precautions for Using Static Sensitive Devices ... 4-5
4-5. Disassembly and Reassembly.............................................. 4-5
4-6. Calibration and Backup Fuse Access............................... 4-6
4-7. Main PCB Access............................................................ 4-7
4-8. LCD and Microcomputer PCB Disassembly and
Assembly......................................................................... 4-8
4-9. Backup Fuse Replacement................................................... 4-11
4-10. Cleaning............................................................................... 4-11
4-11. Performance Tests ................................................................... 4-12
4-12. Initial Procedure.................................................................. 4-12
4-13. Microcomputer and Display Test......................................... 4-12
4-14. Voltage Test......................................................................... 4-13
4-15. Resistance Test.................................................................... 4-14
4-16. Continuity Test.................................................................... 4-15
4-17. Current Test......................................................................... 4-15
4-18. Diode Test ........................................................................... 4-17
4-19. Calibration Adjustments.......................................................... 4-17
4-20. Troubleshooting....................................................................... 4-19
4-21. Self-Tests............................................................................. 4-19
4-22. Ratio Self-Test................................................................. 4-19
4-23. Switch Decoding Self-Test.............................................. 4-20
4-24. Troubleshooting Guide........................................................ 4-21
5 List of Replaceable Parts....................................................... 5-1
5-1. Introduction............................................................................. 5-3
5-2. How to Obtain Parts................................................................ 5-3
5-3. Manual Status Information...................................................... 5-4
5-4. Newer Instruments................................................................... 5-4
5-5. Service Centers........................................................................ 5-4
6 Accessory Information .......................................................... 6-1
6-1. Introduction............................................................................. 6-3
6-2. Deluxe Carrying Case (C90).................................................... 6-3
6-3. Temperature Probes (80T-150C and 80T-150F)..................... 6-3
6-4. Current Transformer (80I-600)................................................ 6-6
6-5. High Voltage Probe (80K-6)................................................... 6-6
6-6. High Voltage Probe (80K-40)................................................. 6-7
6-7. High Frequency Probe (83RF) ................................................ 6-7
6-8. High Frequency Probe (85RF) ................................................ 6-8
6-9. Current Shunt (80J-10)............................................................ 6-9
6-10. AC/DC Current Probe (Y8100)............................................... 6-9
Contents
(continued)
iii
6-11. AC Current Transformer (Y8101)............................................ 6-10
6-12. Safety Designed Test Lead Set (TL70) .................................... 6-11
6-13. Deluxe Test Lead Set (Y8134) ................................................. 6-11
6-14. Slim Flex Test Lead Set (Y8140)............................................. 6-12
6-15. Cables and Adapters ................................................................ 6-12
7 Schematic Diagrams.............................................................. 7-1
8062A
Instruction Manual
iv
v
List of Tables
Table Title Page
1-1. 8062A Accessories................................................................... 1-4
1-2. 8062A Specifications............................................................... 1-5
2-1. Controls, Indicators and Connectors........................................ 2-7
2-2. Input Overload Limits.............................................................. 2-9
2-3. Resistance Function Autoranges and Resolution..................... 2-19
3-1. Voltage Input Divider.............................................................. 3-9
4-1. Required Test Equipment ........................................................ 4-4
4-2. Voltage Test............................................................................. 4-13
4-3. Resistance Test......................................................................... 4-15
4-4. Current Test ............................................................................. 4-16
4-5. Switch Decoding Self-Test ...................................................... 4-21
4-6. Troubleshooting Guide............................................................ 4-22
4-7. Troubleshooting the Resistance Function: Voltage Sources
for Ranges................................................................................ 4-26
4-8. U3 (MAC) Pin Descriptions.................................................... 4-26
5-1. 8062A Final Assembly............................................................. 5-5
5-2. A1 Main PCB Assembly.......................................................... 5-9
5-3. A3 RMS PCB Assembly.......................................................... 5-13
6-1. Cables and BNC, Banana, Phone and Phono Plug Adapters... 6-12
8062A
Instruction Manual
vi
vii
List of Figures
Figure Title Page
2-1. Removal of Battery Compartment Cover................................. 2-4
2-2. Battery Removal and Fuses...................................................... 2-4
2-3. Controls, Indicators and Connectors........................................ 2-6
2-4. 8062A Display......................................................................... 2-8
2-5. Overrange Indicator................................................................. 2-9
2-6. Voltage Operation.................................................................... 2-11
2-7. AC and DC Waveform Components........................................ 2-12
2-8. Multiplication Factors for Converting Waveforms.................. 2-13
2-9. High Impedance DC Voltage................................................... 2-14
2-10. Current Operation.................................................................... 2-16
2-11. Calculating Burden Voltage Error ........................................... 2-18
2-12. Resistance Operation ............................................................... 2-18
2-13. Selection of Autoranging Kilohms........................................... 2-21
2-14. Diode Test................................................................................ 2-21
2-15. Relative (REL) Operation........................................................ 2-22
2-16. Continuity ( ) Operation .................................................. 2-26
3-1. 8062A Block Diagram............................................................. 3-4
3-2. Analog Portion of the A/D Converter...................................... 3-7
3-3. A/D Measurement Cycle.......................................................... 3-7
3-4. Voltage Measurement.............................................................. 3-8
3-5. Current Measurement............................................................... 3-10
3-6. Resistance/Continuity Measurement........................................ 3-11
4-1. Calibration and Backup Fuse (F2) Access............................... 4-7
4-2. Assembling/Disassembling the Microcoputer PCB and LCD.. 4-9
4-3. Disassembling the LCD........................................................... 4-10
4-4. General Equipment Connection............................................... 4-14
4-5. Equipment Connection for Current Test.................................. 4-16
5-1. 8062A Final Assembly............................................................. 5-7
5-2. A1 Main PCB Assembly.......................................................... 5-12
5-3. A3 RMS PCB Assembly.......................................................... 5-14
6-1. Accessories .............................................................................. 6-4
7-1. A1 Main PCB Component Locations (TopView).................... 7-3
7-1. A1 Main PCB Component Locations (Bottom View) ............. 7-3
7-2. Test Point Locations................................................................ 7-4
7-3. A/D Measurement Cycle.......................................................... 7-5
7-4. Switch Detail............................................................................ 7-6
8062A
Instruction Manual
1-2
Introduction and Specifications
Introduction
1
1-3
1-1. Introduction
Your Fluke Model 8062A is a handheld, microcomputer-based 4-1/2 digit
multimeter that is ideally suited for use in the field, laboratory, shop or
home. The 8062A has all the features that have become accepted standards
for quality handheld multimeters, as well as some new features that have not
been offered before in a handheld multimeter. New features include the
following:
• True rms measurements for ac signals up to 30 kHz.
• Resistance measurements up to 300 MΩ.
• Ability to store any input signal as an offset or relative reference value.
Other features include:
• FUNCTIONS:
Standard DMM measurement functions, such as ac and dc volts and ac
and dc current, as well as resistance, continuity, and diode test.
• RANGES:
Leading zero suppression.
Automatic polarity.
Overrange indication.
Protection from overloads and transients up to 1500V peak.
Dual-slope integration a/d conversion to ensure noise-free
measurements.
Autora nging MΩ resistance range (to 300 MΩ), as well as four fixed
resistance ranges fr om 200Ω to 200 kΩ.
• OPERATOR CONVENIENCE:
4-1/2 digit Liquid Crystal Display.
Software-control self-test routines for quick verification of internal
circuitry and operation.
• POWER:
170 hours of continuous operation can be expected from a 9V alkaline
battery (NEDA 1604).
8062A
Instruction Manual
1-4
Low battery voltage is automatically detected and displayed. The low
battery indication, BT, appears on the display when about 20% of the
battery life remains.
A full line of accessories is available to enhance the capabilities of the
8062A. The accessories are listed in Table 1-1 and described in Chapter 6.
Table 1-1. 8062A Accessories
Model No.* Description
A81
C-90
80T-150C
80T-150F
80I-600
80K-6
80K-40
80J-10
83RF
85RF
Battery Eliminator
Vinyle Carrying Case
Temperature Probe °C
Temperature Probe °F
Current Transformer 2’ jaws
High Voltage Probe (6 kV)
High Voltage Probe (40 kV)
Current Shunt
High Frequency Probe (100 MHz)
High Frequency Probe (500 MHz)
*BNC, banana plug, phone and phono adapters are also abaialbe as
accessories and are listed in Section 6.
1-2. Specifications
The specifications for the 8062A are listed in Table 1-2.
Introduction and Specifications
Specifications
1
1-5
Table 1-2. 8062A Specifications
Electrical
The following specifications are based on a one-year calibration cycle, an
operating temperature of 18 to 28°C (64 to 82°F) and a relative humidity not
exceeding 90%.
DC Voltage
Range Resolution Accuracy
±(% of reading + no. of digits)
200 mV
2V .01 mV
.1 mV 0.05% + 2
20V
200V
1000V
1 mV
10 mV
100 mV 0.07% + 2
Response Time.............................. 1 second maximum, to rated
accuracy within selected range.
Input Impedance............................ 10 MΩ shunted by >100 pf
Normal Mode Noise Rejection ....... >60 dB at 50 Hz or 60 Hz
Common Mode Noise Rejection .... >120 dB at dc, >90 dB at 50 Hz and
60 Hz (1 kΩ imbalance)
Overload Protection....................... 1000V dc or peak ac continuous,
except 20 seconds maximum on 200
mV and 2V ranges above 300V dc or
rms.
DC Voltage, High Impedance Mode
All specifications are the same as for the dc voltage mode except the
following (only 200 mV and 2V ranges are available):
Range Resolutions Accuracy
±(% of reading + no. of digits)
200 mV
2V .01 mV
.1 mV 0.06% + 2
Input Impedance............................ >1000 MΩ, typically 10,000 MΩ
Overload Protection....................... 300V dc or rms continuous, 20
seconds maximum 300V to 1000V dc
or peak ac.
8062A
Instruction Manual
1-6
Table 1-2. 8062A Specifications (cont)
AC Voltage (True RMS, AC-Coupled)
Ranges.............................................. 200 mV, 2V, 20V, 200V, 750V
Accuracy *.......................................... ±(% of reading + no. of digits). See table
below:
Input
Voltage Resolution Range 20 Hz -
45 Hz 45 Hz -
500 Hz 500 Hz -
10 kHz 10 kHz -
30 kHz
20.0 -
199.99 mV .01 mV 200 mV 0.5%
+ 20 1%
+ 40
.2000 -
1.9999V .1 mV 2V 1% +10
2.000 -
19.999V 1 mV 20V 0.5% +12 5% +20 5% +40
20.00 -
199.99V 10 mV 200V
75.0 -
499.9V 100 mV 750V Not
Specified 1%
+10 Not Specified
500.0 -
750.0V 2%
+10
* Not spec i f i ed for input < 10% of range. 1 kHz
Input Impedance......................... 10 MΩ shunted by <100 pF
Common Mode Noise
Rejection..................................... >60 dB at 50 Hz and 60 Hz (1 kΩ
imbalance)
Crest Factor Range..................... 1:1 to 3:1
Response Time........................... Five seconds maximum to rated
accuracy within selected range, 12
seconds to rated accuracy from an
overload.
Overload Protection.................... 750V rms or 1000V peak continuous
except 20 seconds maximum on the
200 mV range above 300V rms or
300V dc. Input not to exceed a volt-
hertz product of 1x107 (for example,
200V at 50 kHz).
Introduction and Specifications
Specifications
1
1-7
Table 1-2. 8062A Specifications (cont)
Resistance
Ranges...................................... 200Ω, 2 kΩ, 20 kΩ, 200 kΩ, autoranging
MΩ. The MΩ range extends from .0001
mΩ to 300 MΩ in three autoranged
ranges. Upscale range changes are
made at 2 MΩ and 20 MΩ. Downscale
range changes are made at 19 MΩ and
1.9 MΩ.
Accuracy................................... ±(% of reading + no. of digits). See table
below.
Range Reso-
lution Accuracy Full-
scale
Voltage
Max
Current
Open
Circuit
Voltage
200Ω0.01Ω(0.1%+2+.02Ω) <1.1 mA <4.8V
2 kΩ0.1Ω(0.1%+2) <250 mV <150 µA
20 kΩ1Ω(0.1%+2) <15 µA <1.5V
200 kΩ10Ω(0.1%+2) <1.5 µA
0-1.9999 MΩ100Ω(0.2%+2)
MΩ2-19.99 MΩ10 kΩ(0.25%+3) <2.5 µA
20-99.9 MΩ100 kΩ(1%+3) <2.5V <2.5V
100-300 MΩ1 MΩ(2%+3)
Autoranging k Ω0.1Ω
to 1 kΩ(.20%+5) <1.0 mA
Response Time.............................. Two seconds maximum to rated
accuracy for all ranges except MΩ.
For MΩ, 8 seconds maximum.
Overload Protection....................... 300V dc or rms ac for all ranges
8062A
Instruction Manual
1-8
Table 1-2. 8062A Specifications (cont)
Continuity
Ranges........................................... All resistance ranges
Threshold....................................... Nominally <50% of range (for
example, 100Ω in the 200Ω range)
for 200Ω, 2 kΩ, 20 kΩ, 200 kΩ
ranges. Nominally <100 kΩ in
autoranging kΩ.
Display Indication........................... Horizontal bar across the top of the
display and/or 2.667 kHz tone.
Indication is present for a minimum of
200 ms.
Response Time.............................. 50 µs maximum (10 µs typical)
Overload Protection....................... 300V dc or rms ac
Diode Test
Range ............................................ 2V
Test Current................................... 1 mA (typical)
Accuracy........................................ ±(0.06% of reading + 2 digits)
(Specification applies for voltage
measurement)
Response Time.............................. 1 seconds maximum
Overload Protection....................... 300V dc or rms ac
DC Current
Range Resolution Accuracy
±(% of reading + no. of digits) Burden
Voltage
200 µA
2 mA
20 mA
.01 µA
.1 µA
1 µA0.3% + 2 .3V typical
.3V typical
.3V typical
200 mA
2000 mA 10 µA
100 µA0.7% + 2 .3V typical
.9V typical
Overload Protection....................... 2A/250V fuse (operator replaceable)
in series with 3A/600V fuse (service
personnel replaceable).
Introduction and Specifications
Specifications
1
1-9
Table 1-2. 8062A Specifications (cont)
AC Current (True RMS Responding, AC-Coupled
Accuracy *...................................... ±(% of reading + no. of digits). See
table below.
Input
Current Resolution Range 20 Hz -
45 Hz 45 Hz -
3 kHz 3 kHz -
10 kHz 10 kHz -
30 kHz
20.00 to
199.99 µA0.01 µA 200 µA
.2000 to
1.9999 mA 0. 1 µA 2 mA 2% + 40
2.000 to
19.999 mA 1 µA 20 mA 1% + 10 0.75% + 10 2% + 20
20.00 to
199.99 mA 10 µA 200 mA 1.5% + 10 1% +10
200.0200 to
1999.9 mA 100 µA 2000 mA Not Specified
* Not spec i f i ed for input < 10% of scale.
Burden Voltage.............................. 0.3V rms typical except 2000 mA
range, 0.9V rms typical
Overload Protection....................... 2A/250V fuse (operator replaceable)
in series with 3A/600V fuse (service
personnel replaceable).
Relative
Selection........................................ When the REL button is pushed, the
input applied at that time is stored as
a zero reference point. Subsequent
readings indicate deviations (±) from
the reference point.
Accuracy........................................ Error does not exceed the sum of the
errors of the reference reading and
the subsequent reading.
8062A
Instruction Manual
1-10
Table 1-2. 8062A Specifications (cont)
General
Maximum Common Mode
Voltage............................... 500V dc or ac rms
Display Update Rate......... 2.5 readings/second
Display............................... 4½ digit duplex LCD (19,999 count), leading
zero suppression, autopolarity.
Electromagnetic
Compatibility..................... In an RF field of 1 V/m on all ranges and
functions: Total Accuracy = Specified
Accuracy + 2.3% of range. Performance
above 1 V/m is not specified.
Display Annunciators....... BT (low battery indicator), REL: (relative
function enabled). AND R (continuity
function enabled), and — (bar indicates
continuity detected)."""
A/D Converter.................... Dual-slope converter
Power................................. Single standard 9V battery (NEDA 1604), or
Fluke A-81 Battery Eliminator option
available for 100, 115, or 230V ac operation.
Battery Life........................ Typically 170 hours with an alkaline battery.
BT appears on display when approximately
20% of battery life remains.
Size..................................... 180 mm L x 86 mm W x 45 mm H (7.1” L x
3.4” W x 1.8” H)
Weight................................ .41 kg (14.5 oz.)
Shock and Vibration......... MIL-T-28800B
Environmental
Operating Temperature.... 0 to 50°C
Storage Temperature........ -35 to + 60°C
Accuracy Temperature
Coefficient ......................... 0.1 x the applicable accuracy specification
per °C (plus the initial 23°C specification) for
0 to 18°C and 28 to 50°C.
Relative Humidity.............. 0 to 80% R.H. from 0 + 35°C, 0 to 70%
from + 35°C to + 50°C except 0 to 70% R.H.
for MΩ range above 20 MΩ.
Safety
Safety Standards............... Designed to Protection Class II
requirements of IEC 348, UL1244 ANSI
C39.5, and CSA Bulletin 556B.
Certifications..........................
2-1
Chapter 2
Operation Instructions
Contents Page
2-1. Introduction.................................................................... 2-3
2-2. Unpacking Your Instrument ........................................... 2-3
2-3. Battery Installation or Replacement ............................... 2-3
2-4. Fuse Replacement........................................................... 2-5
2-5. Physical Features............................................................ 2-6
2-6. Front Panel.................................................................. 2-6
2-7. Display........................................................................ 2-8
2-8. Signal Input Limits......................................................... 2-9
2-9. Operation........................................................................ 2-10
2-10. Power-On Self-Test .................................................... 2-10
2-11. AC/DC Voltage (V).................................................... 2-11
2-12. True RMS Measurement ......................................... 2-11
2-13. AC-Coupled AC Measurements.............................. 2-12
2-14. Waveform Comparison and Conversion.................. 2-13
2-15. High Impedance DC Voltage .................................. 2-14
2-16. AC/DC Current (A)..................................................... 2-15
2-17. Resistance (Ω)............................................................. 2-18
2-18. Autoranging Megohms............................................ 2-19
2-19. Autoranging Kilohms.............................................. 2-20
2-20. Diode Test (G).......................................................... 2-21
2-21. Relative (REL)............................................................ 2-22
2-22. Continuity ( ) .................................................. 2-25
2-23. Initial Check-Out Procedure........................................... 2-25
8062A
Instruction Manual
2-2
Operation Instructions
Introduction
2
2-3
2-1. Introduction
This chapter describes how to make measurements with your 8062A. Even
though you may have used a multimeter befor e, we suggest that you take the
time to read this material carefully so that you can take full advantage of the
wide variety of measurement functions offered by the 8062A.
2-2. Unpacking Your I nstr ument
Your instrument was shipped with two test leads (one red and one black), a
9V battery, and this manual. Check the shipment carefully and immediately
contact the place of purchase if anything is missing or damaged in shipment.
If reshipment is necessary, please use the original shipping container. If the
original container is not available, be sure that adequate protection is
provided to prevent damage during shipment. It is recommended that the
instrument be surrounded by at least three inches of shock-absorbing material
in the shipp i ng container .
2-3. Battery Installation or Replacement
The 8062A is designed to operate on a single, common, inexpensive 9V
battery (NEDA 1604). You can expect a typical operating life of up to 170
hours with an alkaline battery, or 80 hours with a carbon-zinc battery. When
the battery has exhausted about 80% of its useful life the BT indicator will
appear at the far left of the display. Your instrument will continue to operate
properly for at least 24 hours with an alkaline battery after BT first appears
on the display. The 8062A also may be operated from a standard ac power
line outlet when used with the optional A81 Battery Eliminator (refer to
Chapter 7 for a description). Use the following procedure to install or replace
the battery:
Warning
To avoid electrical shock, turn off the instrument and
remove the test leads and any input signals before
replacing the battery.
1. Set the 8062A power switch to OFF.
2. Remove test leads from external connections and from the 8062A input
terminals.
8062A
Instruction Manual
2-4
3. Turn the instrument over and remove screw from battery cover as shown
in Figure 2-1.
4. Use your thumbs to push off the battery cover as shown in Figure 2-1.
5. Slide the battery out of the compartment as shown in Figure 2-2.
6. Carefully pull the battery clip free from the battery terminals (if
replacing the battery) and attach the new battery.
7. Slide the battery and its leads into the compartment and slide the cover
into place.
WARNING
TO AVOID SHOCK REMOVE
INPUTS BEFORE OPENING
CLOSE COVER BEFORE USE
WARNING
TO AVOID SHOCK REMOVE
INPUTS BEFORE OPENING
CLOSE COVER BEFORE USE
Backside of
8060A
Use thumbs to push
battery cover down
and then out from
instrument case.
dy03f.eps
Figure 2-1. Removal of Battery Compartment Cover
Fuse in Circuit
Spare Fuse
dy04f.eps
Figure 2-2. Battery Removal and Fuses
Operation Instructions
Fuse Replacement
2
2-5
You ca n measur e the voltage of your battery by using the following
procedure:
1. Select the dc voltage function and the 20V range.
2. Locate the opening for the battery eliminator jack on the right side of the
instrument to the right of the display. Touch the red (VΩS) probe tip to
the side contact (not the center pin). Be sure you do not short the battery
by shorting the side contact to the center pin. Battery voltage should be
between 5.2V to 10V for pr oper operation. If the voltage is less, the
battery should be replaced.
2-4. Fuse Replacement
There are two fuses located at the right side of the battery compartment
(refer to Figure 2-2 or examine your instrument). The fuse at the far right is
F1. Fuse F1, 2A/250V, protects the current input from an input overload.
The other fuse is a spare fuse for F1. When you purchase your instrument, F1
should be installed and the spare fuse should be in one of the two slots next
to it. The larger slot is for the American-style fuse, and the smaller slot is for
the European-style fuse (either style fuse fits in the installation
compartment).
If you need to replace F1, use the tip of a test lead to push the fuse forward
from the end and then up to release. Replace F1 with the appropriate
2A/250V fuse; American-style: fast-acting, type AGX2, 1/4 x 1”, Fluke PN
376582; European-style: 5 x20 mm, Fluke PN 460972. Do not use makeshift
fuses or short-circuit the fuseholder.
There is another fuse, F2, 3A/600V, which also protects the current input.
The instrument cover must be removed to replace F2. This procedure is
described in Chapter 4 and should only be done by a person qualified to
service the instrument.
The following steps provide a quick and easy way to check the condition of
both fuses F1 and F2:
1. Select the resistance function and the 2 kΩ range.
2. Touch the red test lead tip to the A input jack so that the VΩS input and
the A input are shorted together.
3. If the display reads .1000 ± .0100 kΩ, both fuses are good.
4. If the display read OL, one or both fuses need replacement.
8062A
Instruction Manual
2-6
2-5. Physical Features
Before you begin using your 8062A, we suggest you take a few minutes to
familiarize yourself with the instrument. All of the externally accessible
features are shown in Figure 2-3 and described in Table 2-1. The front panel
and the display are also described in the following paragraphs.
2-6. Front Panel
The front panel of the 8062A is designed to make function and range
selection easy. T he symbols and colors on the panel indicate which switches
to push or b utto ns to press to select the function you want. Details are
provided later with the description of each function.
2000mA
A
ACOMMON V S
V S
200mA 200 200k
200
µ
A
DC
AC
200mV 200
20mA 20 20k
2mA 22k
1000 DC
750 AC M
REL
1000V DC
750V AC
MAX
2A MAX 500V MAX
!
!
12
11
10
9
1
2
7
8
3
4
5
6
dy05f.eps
Figure 2-3. Controls, Indicators and Connectors
Operation Instructions
Physical Features
2
2-7
Table 2-1. Controls, Indicators and Connectors
Item
No. Name Function
1W* Battery Eliminator
Connector External input power connector for use with
the A81 Battery Eliminator accessory.
2 Function Buttons:
, REL Push buttons that toggle on or toggle off the
‘secondary functions: visible or audible
continuity, or relative. These functions are
selected in conjunction with the primary
measurement functions (see items 7 and 8).
3 Battery
Compartment and
Cover
Cover for the 9V battery and the current fuse
F1.
4V Ω S Input
Connector Protected test lead connector used as the
high input for all voltage, resistance, and
continuity measurements. All test lead
connectors accept standard or safety-
designed banana plugs.
5 COMMON Input
Connector Protected test lead connector used as the
low or common input for all measurements.
6 A Input Connector Protected test lead connector used as the
high input for current measurements.
7 Function
Switches: A,V, Ω,Interlocked switches that are used in
conduction with the input connectors to
select the measurement functions. Pushing
one switch releases the other, or both may
be pushed together.
8 AC/DC Function
Switch Push-on/push-off switch is used to select ac
or dc for current or voltage measurements.
(Does not affect selection of diode test or
resistance functions).
9 Range Switches Interlocked switches that are used to select
ranges. Pushing a switch selects the
corresponding range and released other
switch depressions. Also used to select
conductance and the diode test.
* For safe operation, fully insert the A81.
8062A
Instruction Manual
2-8
Table 2-1. Controls, Indicators and Connectors (cont)
Item
No. Name Function
10 Tilt Bail A fold-out stand. The bail may also be
removed (press on one of the legs at the
hinge of the bail) and reinserted from the top
as a hook for hanging the instrument.
11 Power Switch Slide switch for turning instrument on or off.
12 Display 4½ digit LCD display (19999 maximum) with
decimal point, minus sign, over-range,
continuity and relative indicators.
2-7. Display
The 8062A provides measurement results on the 4-1/2 digit LCD display
(refer to Figure 2-4 or your instrument). The decimal point is placed
automatically. Symbols in the upper portion of the display indicate when one
of the secondary functions is enabled. The measurement units are indicated
by the range switch that is pushed in. Leading zeroes no t displayed.
Relative
Function
in Use
Audible
Continuity
Enabled
Visible Continuity
Enabled
Low Battery
Indicator
Continuity
Indicator
dy06f.eps
Figure 2-4. 8062A Display
If you are taking a measurement and the OL symbol appears on the display
(Figure 2-5), an overrange cond ition is indicated, meaning that the input is
higher than the range selec t ed. You should sele ct a higher r ange for the
measurement. The OL symbol does not necessarily mean that the instrument
is being exposed to a damaging input condition. Fo r example, when
measuring resistance, an open input will cause OL to app ear.
Operation Instructions
Signal Input Limits
2
2-9
dy07f.eps
Figure 2-5. Overrange Indicator
2-8. Signal Input Li mi ts
Caution
Exceeding the maximum input overload limits can
damage your instrument.
Before you begin to use your 8062A, it is important to note the maximum
inputs that may be applied to the instrument. Table 2 -2 presents the
maximum inputs that are allowed for each function, range, and input
terminal.
Warning
To avoid electrical shock and/or instrument damage, do
not connect the common input terminal to any source
more than 500 volts dc or rms ac above earth ground.
Table 2-2. Input Overload Limits
Function Input Terminals Maximum Input Limit
AC Voltage VΩS and COMMON 750V rms or 1000V peak
continuous except 20
seconds maximum on the
200 mV range above 300V
dc or ac rms.
DC Voltage VΩS and COMMON 1000V dc or peak ac
continuous except 20
seconds maximum on the
200 mV and 2V ranges
above 300V dc or ac rms.
AC or DC Current A and COMMON 2A maximum, fuse
protected to 600V dc or ac
rms.
Resistance, Diode
Test, and Continuity VΩ and COMMON 300V dc or ac rms.
8062A
Instruction Manual
2-10
2-9. Operation
The following paragraphs describe the power-on self-test, and how to
operate your 8062A in each of the seven primary functions or the two
secondary functions.
2-10. Power-On Self-Test
To turn on your instrument, locate the green switch on the left side of the
instrument and slide it forward. Whenever you turn on the instrument, the
8062A automatically performs a self-test to make sure the display and the
microco mputer are functioning properly. If everything is functioning
prop e rly, all the LCD segments in the display will turn on (Figure 2-4).
After about one or two second s, the display will go blank briefly before
responding to switch selections.
If the LCD segments do not all turn o n d uring the self-test, or if the
instrument does not clear the display after the test and then respond to switch
selections, something is probably wrong with the instrument. Try the test
again, and if it fails, have a qualified person refer to Chapter 4. If there is no
display when you turn on the instrument, check the battery and ba ttery
connections. You will find that if you turn off your instrument and then
immediately turn it back on, a random assortment of LCD segments may be
displayed. This is normal. After about a second the instrument should turn on
all the LCD segments as usual during the self-test.
Operation Instructions
Operation
2
2-11
2-11. AC/DC Voltage (V)
Selection of the ac or d c voltage (V) functions is described in Figure 2-6.
The 8062A offers five ac and five dc voltage ranges: 200 mV, 2V, 20V,
200V, and 750V ac/1000V dc. All ranges present a 10 MΩ input impedance,
which is shunted by <100 pF.
2000mA
A
ACOMMON V Ω S
VΩS
200mA 200 200k
200µA
DC
AC
200mV 200Ω
20mA 20 20k
2mA 22k
1000 DC
750 AC MΩ
REL
1000V DC
750V AC
MAX
2A MAX 500V MAX
!
!
Low (-)
Voltage (V)
High (+)
1. Select a range.
2. Set AC/DC switch out
for DC, in for AC.
3. Press switch in to select
voltage function.
4. Ensure all other switches are out.
5. Connect the test leads as shown above.
6. Heed the input overload limits (Table 2-2) and connect the leads
to the circuit being measured.
7. Read the measured value on the display.
dy08f.eps
Figure 2-6. Voltage Operation
2-12. True RMS Measurement
One of the most useful features of the 8062A is the direct measurement of
true rms or effective ac voltages and ac currents. Mathematically, rms is
defined as the square root of the sum of the squares of the ac and dc
components. In physical terms, rms is equivalent to the dc value that
dissipates the same amount of heat in a resistor as the original waveform.
The reason that rms is so valuable is that it greatly simplifies the analysis of
8062A
Instruction Manual
2-12
complex ac signals. Since rms is the dc equivalent to the original waveform,
it can be used in the relationship s d erived from Ohm’s law (E = I x R), and
provides a reliable basis for comparing dissimilar waveforms.
Most meters in use today have average-responding ac converters rather than
true rms ac converters like the 8062A. Usually the gain in average-
responding meters is adjusted so that the reading gives the rms value,
provided the input signal is a harmonic-free sinusoid. Ho wever, if the signal
is not sinusoidal, the average-responding meter does not give correct rms
readings.
The 8062A ac converter actually calculates the rms value through analog
computation. This means that 8062A readings are accurate rms values not
only for harmonic-free sinusoids, but also for mixed frequencies, modulated
signals, square waves, sawtooths, 10%-d uty-cycle re ctangular pulses, etc.
2-13. AC-Coupled AC Measurements
Input signals are ac-coupled in the ac functions. One of the major advantages
of ac-coupling is that ripple measurements can be made on power supplies,
phone lines, etc. Ripple measurements cannot be made with dc-coupling.
Remember, however, that when the 8062A measures signals with the ac
voltage function, the reading on the display does not include the dc
component (if it exists). For example, consider the waveform in Figure 2-7.
The ac voltage function will measure the ac rms component. The dc voltage
function will measure the dc component. To obtain the total rms value for
such a waveform, first measure the ac and dc values separately, then
calculate the total rms value using the formula given in Figure 2-7.
0V
(ac rms component)
2
+ (dc component)
2
RMS Total =
AC Component
DC Component
dy09f.eps
Figure 2-7. AC and DC Waveform Components
Operation Instructions
Operation
2
2-13
2-14. Waveform Comparison and Conversion
Figure 2-8 shows the relationship between common waveforms and the
display readings for the 8062A and average-responding meters. Figure 2-8
also illustrates the relationship be tween ac and dc measurements for ac-
coupled meters. For example, consider the first waveform, a 1.414V (0-pk)
sinewave. Both the 8062A and the rms-calibrated average-responding meter
display the correct rms reading of 1.000V (the dc component equals 0).
However, consider the 1.414V (0-pk) rectified square wave. Both types of
meters correctly measure the dc component (0.707V). But only the 8062A
correctly measures the ac component (0.707V). The average-responding
meter measures 0.785V, which amounts to a 5.6% error in the total rms
measurement calculated from the ac and dc components.
AC Coupled Peak Voltages Display Readings DC and AC
Input AC Component Only DC Total RMS
Waveform PK - PK 0 - PK RMS CAL* 8062A Component
only
TRUE RMS =
ac + dc
22
Sine
PK
0PK-PK
2.828 1.414 1.000 1.000 0.000 1.000
PK-PK
0
PK
Rectified Sine
(Full Wave)
1.414 1.414 0.421 0.435 0.900 1.000
PK-PK
Rectified Sine
(Half Wave)
0
PK
2.000 2.000 0.764 0.771 0.636 1.000
PK-PK
0
PK
Square
2.000 1.000 1.110 1.000 0.000 1.000
PK-PK
0
PK
Rectified
Square
1.414 1.414 0.785 0.707 0.707 1.000
PK-PK
Rectangular
Pulse
0
PK XY
D = X/Y
K = D-D
2
2.000 2.000 2.22K 2K 2D 2 D
PK-PK
Triangle
Sawtooth
0
PK
3.464 1.732 0.960 1.000 0.000 1.000
RMS CAL is the displayed value for average responding meters that are calibrated to display RMS for sine waves.
Figure 2-8. Multiplication Factors for Converting Waveforms
8062A
Instruction Manual
2-14
Since ave rage-respondi ng meters have b een in use for so long, you may have
accumulated test or reference data based on them. The conversion factors in
Figure 2-8 should help you convert between the two measurement methods.
2-15. High Impedance DC Voltage
Occasionally you may want to make dc voltage measurements in high
impedance circuitry where even the 10 MΩ input impedance for the normal
dc voltage function could load the circuit and cause significant errors. For
example, a 10 MΩ input impedance causes a .1% error when measuring the
voltage across the 10 kΩ leg of a 90 kΩ over 10 kΩ voltage divider . The
8062A offers a >1000 MΩ (typically >10,000 MΩ) input impedance dc
voltage function which greatly reduces this error.
Figure 2-9 describes how to select the high input impedance dc voltage
function (the ac voltage function does not operate in this mode). Notice that
all of the function switches must be out to select this function. Either the 2V
or the 200 mV ranges may be selected.
2000mA
A
ACOMMON V Ω S
VΩS
200mA 200 200k
200µA
DC
AC
200mV 200Ω
20mA 20 20k
2mA 22k
1000 DC
750 AC MΩ
REL
1000V DC
750V AC
MAX
2A MAX 500V MAX
!
!
Low (-)
High Impedance
DC Voltage (V)
High (+)
1. Select the 2V or
the 200 mV range.
2. Ensure all function
switches are out.
3. Connect the test leads as shown.
4. Heed the input overload limits
(Table 2-2) and connect the leads to
the circuit being measured.
5. Read the measured value on the display.
dy10f.eps
Figure 2-9. High Impedance DC Voltage
Operation Instructions
Operation
2
2-15
Note
When taking measurements in the high impedance dc voltage
function, do not select any ranges except the 2V or 200 mV ranges.
Measurement in other ranges will result in erroneous readings.
Note
When the high impedance dc voltage function is selected and no
inputis applied, noise from the environment (such as rf or power
line noise) may cause the 8062A to display OL (overrange).
2-16. AC/DC Current (A)
Selection of the ac or dc current (A) function is described in Figure 2-10.
The 8062A offers five ac (true rms ac-coupled) and five dc current ranges:
200 µA, 2 mA, 20 mA, 200 mA, 2000 mA. Each range is protected by a
2A/250V fuse in series with a 3A/600V fuse.
When a meter is placed in series with a circuit to measure current, you may
have to consider an error caused by the voltage drop across the meter (in this
case, a c ross the pr otective fuses a nd current shunts). This volta ge drop is
called the burden voltage. The maximum full-scale burden voltages for the
8062A are 0.3V for the four lowest ranges and 0.9V for the highest range.
These voltage drops can affect the accuracy of a current measurement if the
curre nt source is unr egulated a nd the resistance of the shunt and fuses
represents a significant part (1/1000 or more) of the source resistance. If
burden voltage does present a problem, you can calculate the error by using
the formula in Figure 2-11. You can minimize this error by selecting the
highest curr ent range that provid es the necessa ry resolution.
8062A
Instruction Manual
2-16
2000mA
A
ACOMMON V Ω S
VΩS
200mA 200 200k
200µA
DC
AC
200mV 200Ω
20mA 20 20k
2mA 22k
1000 DC
750 AC MΩ
REL
1000V DC
750V AC
MAX
2A MAX 500V MAX
!
!
Low (-)
Current (A)
High (+)
1. Select a range.
2. Set AC/DC switch out
for DC, in for AC.
3. Push both switches at the same
time to select current function.
4. Ensure all other switches are out.
5. Connect the test leads as shown.
6. Heed the input overload limits (Table 2-2)
and connect the test leads to the circuit being
measured.
7. Read the measured value on the display.
dy11f.eps
Figure 2-10. Current Operation
Operation Instructions
Operation
2
2-17
E
B
E
S
I
M
Ammeter Shunt
RI
dy12f.eps
Es = Source Voltage
RI = Load resistance + Source resistance
Im = Measured current (display reading in amps)
Eb = Burden voltage (calculated)
Eb = meas. current [(200/current range in mA) + .35]
Error:
Error in % = 100 x Eb/(Es - Eb)
Error in A = (Eb x Im)/(Es - Eb)
Example:
ES = 15V
RI = 100 kΩ
Im = 148.51 µA (.14851 mA)
Eb = 148.51 x 10 -6 x [(200/.2) + .35]
= 148.51 x 10-6 x 1000.35 = 148.56 mV
Max, error in % = 100 x [148.56 mV/(15V - .14856V)] = 1.0003%
Add this to the range spec. accuracy
Max. error in % = 1.0003% ±(.2% + 2 digits)
Max. error in A = (148.56 mV x 148.51 µA)/(15000 mV - 148.56 mV)
= 1.486 µA
Add 1.486 µA to the reading for correct current
Figure 2-11. Calculating Burden Voltage Error
8062A
Instruction Manual
2-18
2-17. Resistance (
Ω
)
Selection of the resistance function is described in Figure 2-12. There are
four fixed ra nges (200Ω, 2 kΩ, 20 kΩ, 200 kΩ) plus the auto ranging MΩ
range c onsisting of three ranges: 2 MΩ, 20 MΩ, and 300 MΩ.
In all fixed resistance ranges (200Ω, to 200 kΩ), the test voltage is less than
that required to turn on most semiconductor junctions. This feature,
sometimes referred to as “low power” ohms, aids in troubleshooting by
allowing you to measure resistors indep e ndent of effects of in-circuit
transistors and diodes. For the fixed ranges the maximum full scale voltage
across the circuit being measured is less than 250 mV. The autoranging MΩ
ranges ha ve enough voltage to turn on se miconductor junctio ns (maximum
2.5V full scale), but the current is very low (2.2 µA maximum).
2000mA 2000nS
A
ACOMMON V Ω S
VΩS
200mA 200 200k
200µA
DC
AC Hz
200mV 200Ω
20mA 20 20k
2mA 22k
1000 DC
750 AC MΩ
REL
1000V DC
750V AC
MAX
2A MAX 500V MAX
!
!
Resistance ( )
Low (-)
High (+)
1. Select a range
2. Push switch in for
resistance function.
3. Ensure all other switches
are out (except the AC/DC
switch which can be in or out).
4. Connect the test leads as shown.
5. Ensure that the device being measured
contains no electrical energy.
6. Heed the input overload limits (Table 2-2) and
connect the test leads to the device being measured.
7. Read the measured value on the display.
dy13f.eps
Figure 2-12. Resistance Operation
Operation Instructions
Operation
2
2-19
Resistance measurements for all ranges are made using a two-wire
ratiometric technique. This means that test lead resistance may affect the
accuracy in the 200Ω range. You can correct this error by shorting the test
leads together, reading the test lead resistance, and then subtracting it from
resistance readings. The most convenient way to do this is with the relative
function as described later in this chap ter. This technique is also useful for
removing the . 02Ω error factor in the 200Ω range (refer to resistance
specifications in Chapter 1).
2-18. Autoranging Megohms
When the autoranging MΩ range is selected, the 8062A automatically selects
the range appropriate for the measurement. The measurement resolution
decreases in the two higher MΩ ranges as shown in Table 2-3. Readings
made at the crossover points between ranges are microcomputer-stabilized
by an offset in the upscale and downscale directions. Range changes are
made at 2.00 MΩ and 20.00 MΩ as readings go upscale, or at 19.0 MΩ and
1.90 MΩ as readings go downscale.
Table 2-3. Resistance Function Autoranges and Resolution
Range Resolution No. of Digits
Possible in
Reading
2 MΩ100Ω4½
MΩ20 MΩ10 kΩ3½
Autorange 300 MΩ20 to 99.9 MΩ
100 to 300 MΩ100 kΩ
1 MΩ3
3
kΩ2 kΩ
20 kΩ0.1Ω
10Ω4½
3½
Autorange 300 kΩ20 to 99.9 kΩ
100 to 299 kΩ100Ω
1 kΩ3
3
8062A
Instruction Manual
2-20
2-19. Autoranging Kilohms
Although it is not indic a t ed on the front panel, there is an add itional
autora nging range availa ble: the autoranging kΩ range, which consists of 2
kΩ, 20 kΩ, and 300 kΩ ranges. To se lect this range, you must
simultaneously press the MΩ and the 200Ω switches as shown in Figure 2-
13. Like the autoranging MΩ ranges, the autoranging kΩ ranges have enough
voltage to turn on semiconductor junctions. Note that the use of the relative
function with the autoranging kΩ ranges is restricted to the auto ranging kΩ
ranges. Refer to the description o f the relative function for more information.
The autoranging kΩ has the same decrease in resolution (see Table 2-3) and
the same display hysteresis as the autoranging MΩ.
2000mA
A
ACOMMON V Ω S
VΩS
200mA 200 200k
200µA
DC
AC
200mV 200Ω
20mA 20 20k
2mA 22k
1000 DC
750 AC MΩ
REL
1000V DC
750V AC
MAX
2A MAX 500V MAX
!
!
Low (-)
High (+)
1. Push both the MΩ and
200Ω switches at the
same time to select the
KΩ autorange.
2. Press switch in to select
resistance function and
measure resistance as
described in Figure 2-12.
dy14f.eps
Figure 2-13. Selection of Autoranging Kilohms
Operation Instructions
Operation
2
2-21
2-20. Diode Test (
G
)
Selection of the diode test is described in Figure 2-14. Notice how the test
leads are placed to forward-bias or reverse-bias the diode in the figure.
The diode test measures the forward voltage of a semiconductor junction (or
junctions) at a 1 mA (± 10%) test current. Readings are displayed in the 2V
range, with OL displayed for voltages greater than 2V. For a silico n diode,
the typical forward voltage at 1 mA is about 0.6V. A reverse-biased
semiconductor junction should display the overrange (OL) indicator
provided that any resistance parallel to the junction is greater than 2 kΩ.
2000mA
A
ACOMMON V Ω S
VΩS
200mA 200 200k
200µA
DC
AC
200mV 200Ω
20mA 20 20k
2mA 22k
1000 DC
750 AC MΩ
REL
1000V DC
750V AC
MAX
2A MAX 500V MAX
!
!
Diode Test ( )
Low (-)
Forward Bias:
High (+)
Typical reading +
forward-biased
silicon diode.
Overrange display
if parallel resistance
is >2 KΩ.
Reverse Bias:
BlackRed
Black Red
1. Press both switches
simultaneously
2. Set switch to select
diode test
3. Ensure all other switches
are out (except the AC/DC
switch which can be in or out).
4. Connect the test leads as shown.
5. Heed the input overload limits
(Table 2-2) and connect the test
leads to diode being measured.
6. Read the measured value on the display.
dy17f.eps
Figure 2-14. Diode Test
8062A
Instruction Manual
2-22
A quick way to check for shorted or open junctions is to reverse the test
leads. If the junction indicates the same in-scale reading both directions, it is
probably shorted. If the junction indicates an overrange both directions, it is
open.
2-21. Relative (REL)
The relative function allows you to store any reading as an offset or relative
reference value. When you press the REL button, the REL indicator appears
in the upper right corner of the display, and the 8062A stores the next
measurement in a register along with the function and range. Subsequent
measurements are displayed as the difference between the measured value
and the stored relative reference (refer to Figure 2-15).
2000mA
A
ACOMMON V Ω S
VΩS
200mA 200 200k
200µA
DC
AC
200mV 200Ω
20mA 20 20k
2mA 22k
1000 DC
750 AC MΩ
REL
1000V DC
750V AC
MAX
2A MAX 500V MAX
!
!
Relative (REL) Relative (REL)
Button
Low (-)
High (+)
1.
Select range and function
(any measurement function:
V, A, Ω, or ).
2.
Heed input overload limits (Table 2-2),
connect test leads and take desired
measurement (example shows a 1.5000V measurement
has been taken and displayed):
3.
Press the REL button to store the next measured value
as relative reference (display becomes zero and the REL
indicator is displayed). The stored reference is subtracted
from subsequent measurements:
4. To cancel the relative reference, press REL.
The REL
indicator disappears and the original measurement value
is reestablished:
dy18f.eps
Figure 2-15. Relative (REL) Operation
Operation Instructions
Operation
2
2-23
For example, if a reading of 1.0000V dc is displayed when the REL button is
pressed, (the display will read 0.0000 after REL is pressed), subsequent
readings will have 1.0000 subtracted from them. If the next measurement is
1.2700V dc, the reading displayed will be .2700. If the next measurement is
0.8500V dc, the reading displayed will be -.1500. You may cancel the
relative reference by pressing the REL button (the REL indicator disappears
from the display), by turning the instrument off, or by storing a relative
reference with another function.
If you change ranges, the relative reference is automatically multiplied or
divided by the appropriate power of ten before being subtracted from the
measurement. If you change functions, the REL indicator disappears and the
relative reference is stored with the original function. When you reselect the
function, the relative reference is restored (the REL indicator reappears)
unless a new relative reference was established in another function.
The relative function may be used with all the measurement functions: ac or
dc voltage, ac or dc current, resistance, and diode test. When used with
continuity, the relative function stores the accompanying resistance readings.
Note that the input overload limits are not affected by the use of the relative
function.
Another thing to be aware of when using relative reference is that the range
of possible readings is still subject to the limits of the display and the 19999
counts of the analog-to-digital (a/d) converter, regardless of the relative
reference. For example, suppose the instrument is in the dc voltage function
with the 20V range selected, and you store a relative reference of 15V. The
maximum positive voltage reading that can be displayed without overranging
is 4.999V, which is actually a 19.999V input signal. Any input signal greater
than 4.999V exceeds the 19999 counts of the a/d converter. The minimum
(negative) voltage reading that may be displayed without overranging is -
19.999V, which is a -4.999V input signal. Any input signal less that -4.999V
causes an overrange (indicated by OL on the display) because the display has
reached negative full-scale. You can avoid this situation by selecting a higher
range.
Remember that even though the REL indicator appears on the d i splay almost
instantaneously after the REL button is pressed, the relative reference is not
stored until the next measurement takes place. For all functions, the time
between measurements is about 0.4 seconds.
A typical way to use the relative reference is to correct for test lead
resistance. Although test lead resistance is usually very small (typically two
or three Ω), it can be significant when measuring low resistances. To correct
8062A
Instruction Manual
2-24
for it, select the desired resistance range, short the test leads together, and
press the REL button. The REL indicator will appear and the display will
read zero. The 8062A will automatically subtract the stored test lead
resistance from subsequent measurements. Other common applications for
relative reference include: offset nulling (dc and ac voltage or current), diode
and transistor matching (d iode test), r e sistor matching (Ω) and vo ltage
deviation (ac and dc voltage).
Note
The use of the relative function with the autoranging k
Ω
ranges is
restricted to the autoranging k
Ω
ranges. If you take a reference
reading within the autoranging k
Ω
range and then use it as a
reference outside autoranging k
Ω
, or use a reference reading taken
outside autoranging k
Ω
within the autoranging k
Ω
, errors will
result. There is no restriction on the u se o f th e relative function
with the fixed resistance ranges or with autoranging M
Ω
.
Operation Instructions
Initial Check-Out Procedure
2
2-25
2-22. Continuity ( )
To select the continuity function, first select the resistance function and then
press the button und er the display. The button functions like
a three-position switch: the first button press enables visible continuity (the
indicator is displayed), the second button press enables audible
continuity (the is displayed), and the third button p ress cancels
continuity selection (the indicator disappears). The selection of
continuity is summarized in Figure 2-16. W hen continuity is detected, visible
continuity is indicated by the long bar across the top of the display. Audible
continuity (if enabled) is indicated by the tone emitted from the instrument.
Continuity is a quick check to verify whether circuit connections are intact.
The continuity detection thresho ld is typically <50% of the resistance range
selected for the fixed ranges (i.e. continuity is detected if resistance is less
than 100Ω in the 200Ω range, less than 1 kΩ in the 2 kΩ range, etc.). The
detection threshold is <100Ω for the autoranging k Ω range, and <100 MΩ
for the autoranging MΩ range.
The 8062A can detect continuity for intervals as brief as 50 µs (typically as
brief as 10 µs). It extends the visible of audible indication to a minimum of
200 ms to make it easy to observe results. Note that while continuity is
enabled, the 8062A still makes resistance measurements and displays the
readings.
2-23. Initial Check-Out Procedure
Here is an easy procedure you can use to verify that your 8062A is operating
properly for most functions. All you need to perform these tests are the test
leads and access to a standard wall socket. Remember that you are not trying
to verify the instrument accuracy, but are simply confirming that the
functions work. Performance tests and calibration adjustments are presented
in Chapter 4. If the instrument passes the self-test when the instrument is first
turned on, then the display and the microcomputer are working properly.
8062A
Instruction Manual
2-26
2000mA 2000nS
A
ACOMMON V Ω S
VΩS
200mA 200 200k
200µA
DC
AC
200mV 200Ω
20mA 20 20k
2mA 22k
1000 DC
750 AC MΩ
REL
1000V DC
750V AC
MAX
2A MAX 500V MAX
!
!
Continuity ( )
Continuity
Button
Low (-)
High (+)
BEEEEP
1. Select range.
2. Set switch in
for resistance function.
3. Ensure that other switches are out.
4. Press the button once to enable
visible continuity:
Press the button again to enable
audible continuity:
(Press again to disable both):
5. Connect the test leads as shown.
6. Ensure that the device being measured
contains no electrical energy. Heed the input
overload limits (Table 2-2), and connect the
test leads to the circuit.
7. Observe the display for visible continuity
indicated by the bar.
Or listen for tone indicating audible continuity.
dy21f.eps
Figure 2-16. Continuity ( ) Operation
Operation Instructions
Initial Check-Out Procedure
2
2-27
1. DC VOLT AGE - Select the dc voltage function and the 20V ra nge.
Read the battery voltage by touching the probe tip from the lead
connected to the VΩ jack to the side contact (not the center pin) in the
opening for the ba ttery eliminator jack on the right side of the
instrument. Be careful not to short the ba ttery by connecting the side
contact to the center pin. Ba ttery voltage should read 5.2V to 10V. If the
voltage is less than 5.2V, the battery should be replaced.
Warning
Do not touch the probe tips with your fingers, or allow
the probe tips to contact each other.
Local line voltage is measured in the following step:
2. AC VOLTAGE - Select the ac voltage function and the 200V range.
Take note of the preceding warning and insert the probe tips into a
standard wall socket. The display should read the local line voltage.
Carefully remove the probe tips from the wall socket.
3. RESISTANCE, CONTINUITY, DIODE TEST - Select the resistance
function and the 2 kΩ range. T ouch the red (VΩ) p r obe tip to the A jack
so the VΩ input is shor ted to the A input (this is the fuse check
procedure from section 2-4). The display should read .1000 ± .0100 kΩ
(neglecting lead resistance).
Push the button twice to enable the visible and audible
continuity. You should see the bar in the display and hear the tone.
Select the diode test (with the VΩ and A inputs still shorted together).
The display should read .0102 ± .0015V.
Remove the connection between the inputs. The instrument should
indicate OL.
8062A
Instruction Manual
2-28
3-1
Chapter 3
Theory of Operation
Contents Page
3-1. Introduction...................................................................... 3-3
3-2. Functional Description ..................................................... 3-3
3-3. Microcomputer.............................................................. 3-3
3-4. Measurement Acquisition Chip (MAC)........................ 3-5
3-5. A/D Converter Cycle .................................................... 3-5
3-6. Voltage Measurement................................................... 3-8
3-7. Current Measurement .................................................... 3-9
3-8. Resistance Measurement............................................... 3-10
3-9. Continuity Measurement............................................... 3-11
8062A
Instruction Manual
3-2
Theory of Operation
Introduction
3
3-3
3-1. Introduction
This chapter describes how the 8062A works. An overview of the operation
is provided first, followed by description of the two major components and
the measurement functions. A detailed schematic of the instrument appears in
Chapter 7.
3-2. Functional Description
The major circuits and components of the 8062A are arranged in a block
diagram in Figure 3-1. Two major components make up the measurement
system: a four-bit CMOS microcomputer, and CMOS integrated circuit
known as the Measurement Acquisition Chip (MAC). The microcomputer
selects the appropriate measurement function in the MAC according to the
switches or buttons pushed by the operator. The microcomputer also controls
the measurement cycles, performs calculations on measured data, and drives
the display. The MAC measures the conditioned input signals with the a/d
converter or the frequency counter. The MAC also controls the power supply
and the continuity tone generator. The microcomputer and the MAC
communicate through a four-bit bidir ectional b us a nd four control lines. Both
components are described in more detail later in this chapter.
As shown in Figure 3-1, the input signals are routed by the range and
function switches thro ugh the appropriate signal conditioners for input
filtering and scale changes. Input signals for all measurement functions
except frequency are converted to a proportional dc analog voltage that is
applied to the a/d converter. The dual-slope a/d converter converts the dc
analog voltage to a digital number that is sent to the microcomputer. Each of
the major measurement functions are described later in this chapter.
3-3. Microcomputer
The four-bit CMOS microcomputer senses switch positio ns by reading status
register s in the MAC, and senses button p ushe s through input lines connecte d
directly to the microcomputer. The microcomputer processes the information
and then selects the appr opriate digital and analog configuration in the MAC
by writing to an array of MAC control registers.
8062A
Instruction Manual
3-4
Range
and
Function
Switches
Voltage
Divider
and
Ohms Ref
Resistors
Ohms
Source MAC
Digital
Control
Logic
and
REL Push
Buttons
BUS
CTL
Micro-
computer
Power
Supply
Tone
A/D
Converter
Power Supply
Ctl.
Cont.
Logic
+1.0000V
A/D Ref
True RMS
AC Converter
V/Ω/S Ω/S
Ω/S
V
VDC
AC
A
ACurrent
Shunts
Switch Sense
Common
A
Dy25f.eps
Figure 3-1. 8062A Block Diagram
The operation of the instrument is controlled by software routines that are
stored in the microcomputer memory. These routines include the normal
operating routine, the power-on self-test, or special self-test routines that may
be selected by the operator. When the instrument is first turned on, the
microcomputer performs the self-test routine which checks the LCD
segments and the interface to the MAC (refer to Chapter 2 for operating
instructions). While the LCD segments are on (a minimum of 1.6 seconds),
the microcomputer exercises the bus and checks the internal registers in the
MAC to make sure it has control over them. If the microcomputer detects a
problem with the MAC interface, it stays in the self-test routine with the
LCD segments on until the pro blem is resolved or the instrument is turned
off.
After the power-on self-test routine is successfully completed, the
microcomputer checks to see if the operator has selected the ratio self-test or
the switch decoding self-test (refer to Chapter 4 for o perating instructions). If
neither of the self-tests has been selected, the microcomputer begins the
normal operating routine. The operating routine consists of four steps:
1. The microcomputer reads the function and range selections and checks
the two push buttons to determine the mode the op erator has selected.
The microcomputer then configures the a/d converter.
Theory of Operation
Functional Description
3
3-5
2. The microcomputer initiates the a/d measurement cycle (approximately
400 ms) which is described later in this chapter.
3. The microcomputer processes the data obtained in the measurement
cycle. This includes calculations for the relative (REL) offset and MΩ
autoranging.
4. The microcomputer displays the results. The results remain on the
display until it is updated.
After the results are displayed, the routine begins again at the first step.
3-4. Measurement Acquisition Chip (MAC)
A block diagram of the MAC is shown in Figure 3-1. The digital control
logic includes a buffer and decoder, read and write logic, status and control
registers, and logic control for the continuity function. The power supply
control uses the calibrated 1.0000V a/d reference voltage obtained from a
bandgap reference diode to regulate the 5.2V main power supply for the
instrument. When the continuity function is selected and continuity is
detec t ed, the M AC generates the tone by supplying a sq uare wave to the
external piezoelectic transducer.
3-5. A/D Converter Cycle
The heart of the MAC is the dual-slope a/d converter. A block diagram of the
analog portion of the a/d converter is shown in Figure 3-2. The internal
buffer, integrator, and comparators work in conjunction with external
resistors and capacitors to convert the dc analog voltage to a digital number.
The internal switches are FET switches that are controlled by the
microcomputer and the MAC digital control lo gic. The switchable integrator
gain depends of the function and r ange selected.
The complete a/d measurement cycle is shown in Figure 3-3. It consists of
three consecutive time periods: autozero (AZ), integrate (INTEG) and read.
A fourth time period, overload (OL) is also used if an overrange reading is
taken. The total length of the measurement cycle is 400 ms. The length of the
integrate period is fixed at 100 ms. One hundred ms is a multiple of the
period of 50 Hz or 60 Hz power, which helps to reduce the possible power
line noise that might interfere with the measurement. The waveform at the
INTEG capacitor is shown for three sample measurement readings: half-
scale, full-scale, and overrange.
8062A
Instruction Manual
3-6
Read
2V dc
9R R
C
AZ
C
Integ
200 mV
dc
Integ
AZ
++
+
+
Reference
Voltage
Integrator Gain
Integrator Comparators
AZ
Integ or Read
To Digital
Control Logic
Buffer Amp
± Unkown
Input Voltage
Internal to the MAC
dy26f.eps
Figure 3-2. Analog Portion of the A/D Converter
The measurement cycle begins with the autozero period. The AZ switches
close, applying a ground reference as the input to the converter. Under ideal
conditions the output of the comparator would also go to zero. However,
input-offset voltage errors accumulate in the buffer amplifier loop, and
appear at the comparator output as an error voltage. To compensate for this
error, the error is impressed across the AZ capacitor where it is stored for the
remainder of the measurement cycle. The stored level is used to provide
offset voltage correction during the integrate and read periods.
The integrate period begins at the end of the autozero period. As the period
begins, the AZ switches open and the INTEG switches close. This applies
the unknown input voltage to the input of the converter. The voltage is
buffered and then begins charging the INTEG capacitor. T he waveform at
the INTEG capacitor is a ramp from near zero to some maximum value
deter mined by the amplitude and po l a rity of the unknown input voltage.
Theory of Operation
Functional Description
3
3-7
A/D Measurement Cycle
AZ AZ
OL
Integ
100 ms
400 ms
Read
Overrange (“OL” on display)
Fullscale reading
Accumulated Counts
Waveform at
the Integ
Capacitor
OL
19999
10000
0
1
/
2
scale reading
dy27f.eps
Figure 3-3. A/D Measurement Cycle
As the read period begins, the INTEG switches open and the READ switches
close. This applies the known reference voltage from a “flying” capacitor
whose polarity is chosen by the a/d converter to be the opposite of the
polarity of the unknown input voltage. The IN TEG capacitor begins
discharging at a fixed rate while a counter begins counting. The counting
stops counting when the INTEG capacito r voltage equals the initial autozero
voltage. The count is proportional to the unknown input voltage, a nd is
placed on the display by the microcomputer.
If during the read period the co unter counts up to the maximum number of
counts for a full-scale reading (19999 counts) and the INTEG capacitor
charge has not yet reached the initial autozero voltage, the microcomputer
knows an overrange reading has been taken. The microcomputer places
“OL” on the display and commands the a/d converter to go into the overload
(OL) period which rapidly slews the integrator voltage back to the initial
autozero voltage.
The measurement cycle ends at the end of the read period for an on-scale
reading, or at the end of the overload period for an overrange reading. A new
measurement cycle then begins with the autozero period. The display update
rate for measurement functions that use the a/d converter is approximately
0.4s, or about 2-1/2 readings per second.
8062A
Instruction Manual
3-8
3-6. Voltage Measurement
Both the ac and dc voltage ranges use an over-voltage-protected 10 MΩ
input divider as shown in Figure 3-4. The over-voltage protection includes
two 2-watt fusible resistors and four metal-oxide varistors for high voltage
clamping.
V/ΩVoltage
Divider ÷1DC
AC
True RMS
AC
Converter
Inputs
to A/D
Converter
Common LO
HI
÷10
÷100
÷1000
÷100
÷10÷1000
dy28f.eps
Figure 3-4. Voltage Measurement
Depe nding on the ra nge selected, lower leg r esistors of the divider are
connected to gro und to perform the input signal division.
The dc input voltages for all ranges are divided by the appropriate factor of
10 to produce a proportional dc signal which is then filtered and applied to
the input to the a/d converter. The dc and ac voltage ranges and division
factors are listed in Table 3-1 along with the corresponding range of inputs to
the a/d converter. Notice in Table 3-1 that the 2V dc voltage range is divided
by 1 (not 10). The microcomputer compensates by decreasing the integrator
gain in the a/d converter by a factor of 10 (refer to Figure 3-2). The
integrator gain is also reduced by a factor of 10 in the 1000V dc voltage
range, which uses the same divider arrangement as the 200V dc voltage
range.
Theory of Operation
Functional Description
3
3-9
The ac input voltages are divided with the same divider arrangement as the
dc input voltages, with the exception that the 2V ac vo ltage range is divided
by 10. The divider output signals for ac voltages are ac-coupled to the input
of a true rms ac converter which produces a current output. A negative dc
representation o f the ac input signal is filtered and applied to the inp ut of the
a/d converter.
Table 3-1. Voltage Input Divider
Function Range Input
Divider Range of A/D Converter Input
DC Voltage
200 mV
2V*
20V
200V
1000V*
1/1
1/1
1/100
1/1000
1/1000
-200 mV to +200 mV
-2V to +2V
-200 mV to +200 mV
-200 mV to +200 mV
-2V to + 2V (1V max. input)
AC Voltage
200 mV
2V
20V
200V
750V*
1/1
1/10
1/100
1/1000
1/1000
0 to -200 mV
0 to -200 mV
0 to -200 mV
0 to -200 mV
0 to -2V (-0.75V max. input)
*Integrator gain in a/d converter reduced by factor of 10.
3-7. Current Measurement
Current measurements are made using a double-fuse-protected, switchable,
five-terminal cur rent shunt (0. 1 ohm, 1 ohm, 10 ohm, 100 ohm or 1 kilohm)
to perform the current-to-voltage conversion required by the a/d converter. A
block diagram of current measurements is shown in Figure 3-5. When the dc
curre nt function is select ed, the dc voltage drop across the shunt is filtered
and applied to the input of the a/d converter. When the ac current function is
selected the ac volta ge drop a cross the shunt is ac -coupled to the input of the
true rms ac converter. The dc representation o f the ac voltage is filtered and
applied to the input of the a/d converter. All current ranges use the ±200 mV
a/d converter input range.
8062A
Instruction Manual
3-10
DC
AC
Common
A
Inputs
to A/D
Converter
True RMS
AC
Converter
Current
Shunt
LO
HI
dy29f.eps
Figure 3-5. Current Measurement
3-8. Resistance Measurement
Resistance measurements are made using a ratio technique as shown in
Figure 3-6. When the resistance function is selected, a series circuit is
formed by the ohms source, a reference resistor from the voltage divider
(select e d by the range switches), and the external unknown resisto r. The ratio
of the two resistors is equal to the ratio of the voltage drop across each of
them. Since the voltage drop across the reference resistor and the value of the
reference resistor are known, the value of the second resistor can be
determined. Input protection during resistance measurements consists of a
thermistor and a double-transistor clamp.
The operation of the a/d converter during a resistance measurement is
basically as described earlier in this chapter, with a few exceptions. During
the integra t e period the voltage drop acr oss the unknown resistor charges the
INTEG capacitor. During the read period, the voltage across the known
resistor (stored on the flying capacitor) discharges the INTEG capacitor. The
length of the r ead pe riod is a direct indication of the value of the unknown
resistor.
Theory of Operation
Functional Description
3
3-11
3-9. Continuity Measurement
Continuity measurement is a voltage comparison made in the resistance
mode as illustrated in Figure 3-6. The 8062A determines whether continuity
exists in the circuit under test by comparing the voltage drop across the
external circuit with a continuity reference voltage. If the voltage drop acro ss
the external circuit is less than the reference voltage, the comparator sends
the appro priate signal to the continuity logic. The continuity logic notifies
the microcomputer which turns on the visible indicator (the full-length bar
across the top of the display). If the audible indicator is enabled, the
continuity logic enables the tone generator.
The direction threshold is typically 50% of the full scale resistance range
selected. When the 8062A detects continuity for brief intervals (50 µs or
greater), the microcomputer extends the visible and audible indication to a
minimum of 200 ms to allow easy perception by the operator.
Continuity
Ref V
To
Continuity
Logic
Comp.
CM+
CM-
Unknown
Resistor
Known
Ref
Resistor
Ohms
Source
V/Ω/S
+
Common ORef +
ORef -
Known
V Ref
to A/D
Converter
Unknown
V to A/D
Converter
Internal to the MAC
LO
HI
dy30f.eps
Figure 3-6. Resistance/Continuity Measurement
8062A
Instruction Manual
3-12
4-1
Chapter 4
Maintenance
Contents Page
4-1. Introduction.................................................................... 4-3
4-2. Service Information........................................................ 4-3
4-3. General Information ....................................................... 4-5
4-4. Handling Precautions for Using Static Sensitive
Devices ...................................................................... 4-5
4-5. Disassembly and Reassembly ..................................... 4-5
4-6. Calibration and Backup Fuse Access ...................... 4-6
4-7. Main PCB Access.................................................... 4-7
4-8. LCD and Microcomputer PCB Disassembly and
Assembly................................................................. 4-8
4-9. Backup Fuse Replacement.......................................... 4-11
4-10. Cleaning...................................................................... 4-11
4-11. Performance Tests.......................................................... 4-12
4-12. Initial Procedure.......................................................... 4-12
4-13. Microcomputer and Display Test................................ 4-12
4-14. Voltage Test................................................................ 4-13
4-15. Resistance Test ........................................................... 4-14
4-16. Continuity Test............................................................ 4-15
4-17. Current Test................................................................ 4-15
4-18. Diode Test................................................................... 4-17
4-19. Calibration Adjustments................................................. 4-17
4-20. Troubleshooting.............................................................. 4-19
4-21. Self-Tests.................................................................... 4-19
4-22. Ratio Self-Test......................................................... 4-19
4-23. Switch Decoding Self-Test...................................... 4-20
4-24. Troubleshooting Guide............................................... 4-21
8062A
Instruction Manual
4-2
Maintenance
Introduction
4
4-3
Warning
These servicing instructions are for use by qualified
personnel only. To avoid electric shock, do not perform
any servicing other than that contained in the operating
instructions unless you are qualified to do so.
4-1. Introduction
This chapter o f the manual contains information regarding the maintenance
of your instrument. It includes info rmation abut d i sassembly, perfor mance
tests, calibration adjustments, and troubleshooting. The combined
performance tests are recommended as an acceptance test when the
instrument is first received, and can be used later as a preventive
maintenance tool.
A one-year calibration cycle is recommended to maintain the specifications
given in Chapter 1 of this manual. The test equipment required for the
performance tests or calibratio n adjustments is listed in Table 4-1. Test
equipment with equivalent specifications may also be used.
4-2. Service Information
The 8062A is warranted for a period of one year upon shipment of the
instrument to the original purchaser. Conditio ns of the warranty are given at
the front of this manual. Malfunctions that occur within the limits of the
warranty will be corrected at no cost to the purchaser. For in-warranty repair,
call (toll-free) 800 426-0361 for the address of the nearest Fluke Technical
Service Center designate d to service your instrument (in Alaska, Hawaii,
Washington, or Canada call 206-356-5400). Ship the instrument postpaid in
the original shipping container (if available). Dated proof-of-purchase may
be required for in-warranty repairs.
Fluke Technical Service Centers are also available for calibration and/or
repair of instruments that are beyond the warranty period. Call (toll-free) 800
426-0361 for shipping information. Ship the instrument and remittance in
accordance with instructions received.
8062A
Instruction Manual
4-4
Table 4-1. Required Test Equipment
Equipment Required specifications Recommended
Type
DMM
Calibrator
DC Voltage: 0 to 1000V, ±(0.0075%)
AC Voltage:
200 Hz to 1 kHz, 0 to 750V, ±(0.06%)
1 kHz to 10 kHz, 0 to 200 V, ±(0.06%)
10 kHz to 30 kHz, 0 to 200V, ±(0.1%)
30 kHz to 50 kHz, 0 to 200V, ±(0.25%)
50 kHz to 100 kHz, 0 to 2.0V, ±(0.75%)
Resistance: 100Ω to 10.0 MΩ,
±(0.025%)
Fluke 5700A
DC Current: 0 to 2000 mA, ±(0.075%)
AC Current:
20 Hz to 3 kHz, 0 to 2000 mA, ±(0.18%)
Frequency: 25 mV to 200 mV, 100 Hz to
200 kHz, ±(0.1%)
Reference
Resistors 40 MΩ and 290 MΩ, ±(0.1%) Caddock
MG750*
DMM DC Voltage: 200 mV to 20V, ±(0.25%)
DC Current: 2 mA to 200 mA, ±(0.25%) Fluke 87
* Precision high MΩ resistors may be ordered from Caddock Electronics,
3127 Chicago Ave., Riverside, CA, 92507. Be sure to specify 0.1%
tolerance.
Maintenance
General Information
4
4-5
4-3. General Information
4-4. Handling Precautions for Using Static Sensitive
Devices
Caution
0
This instrument contains CMOS components which can
be damaged by static discharge. Static sensitive
components on the main pcb include U3 and U4. The
microcomputer pcb includes one static sensitive
component, U5, the microcomputer. To prevent damage,
take the following precautions when troubleshooting
and/or repairing the instrument:
• Perform all work at a static-free work station.
• Do not handle components or pcb assemblies by their connectors.
• Wear static ground straps.
• Use conductive foam to store components.
• Remove all plastic, vinyl and styrofoam from the work area.
• Use a grounded, temperature-regulated soldering iron.
4-5. Disassembly and Reassembly
The instrument has two pcbs: the main pcb and the microcomputer pcb. To
gain access to the calibration adjustments, the backup fuse, or the LCD, you
have to remove only the top cover. You can also do some troubleshooting
with only the top cover and the top ac shield off. For other troubleshooting or
to gain access to the microcomputer pcb, you have to remove the main pcb
from the case. If you remove the main pcb from the case, you will need to
perform the calibration adjustments. Be sure to heed the notes and cautions
about special handling requirements.
8062A
Instruction Manual
4-6
Note
It is not necessary to remove the main pc b from the botto m case in
order to disassemble or reassemble the LCD. However, because the
LCD and the microcomputer require similar special handling, the
disassembly and reassembly procedures are described together.
Caution
To avoid contaminating the pcbs with oil from the
fingers, handle the pcbs by the edges or wear gloves.
4-6. Calibration and Backup Fuse Access
Use the following procedure to gain access to the calibration adjustments or
the backup fuse (F2):
1. Disconnect the test leads and battery eliminator, if attached. Turn the
power switch off.
2. Remove the three phillips screws from the bottom of the case.
3. Turn the instrument face-up and grasp the top cover at both sides of the
input connectors. Then pull the top cover from the unit. The backup fuse
and the calibration adjustments are now accessible (Figure 4-1).
Caution
The function buttons below the display are part of a
single elastomeric strip (Figure 4-1) that is held in place
by the top cover. When the top cover is removed, the
elastomeric strip will be loose and may be removed. Do
not touch or contaminate the carbon-impregnated switch
contacts on the bottom of the strip or the switch
contacts on the microcomputer pcb. If the contacts do
become contaminated, clean them with isopropyl
alcohol.
4. To reassemble, position the elasto meric strip on the microcomputer pcb
so that the small rubber posts on the bottom of the strip are properly
seated. Install the top cover and fasten the three screws on the bottom
case.
Maintenance
General Information
4
4-7
Elastomeric Strip
Green Power
Switch Cap
AC Shield
Remove before removing
Main PCB. When reassembling,
install shield after installing
Main PCB.
Pry fuse out from the side. Backup Fuse F2
dy32c.eps
Figure 4-1. CALIBRATION AND BACKUP FUSE (F2) ACCESS
4-7. Main PCB Access
Use the following procedure to gain access to the main pcb:
1. Remove the screw in the center of the ac shield and remove the shield.
2. Using your index finger, lift up the lower right corner of the main pcb
until it is free. Then pull the pcb to the right until it clears the shelf under
the buttons.
8062A
Instruction Manual
4-8
Caution
Do not touch or contaminate the plastic insulator that is
attached to the inside of the case bottom. When the
instrument is assembled the insulator makes contact
with the leads on the bottom of the main pcb.
Contaminants could cause undesirable conduction
paths. If the insulator becomes contaminated, clean with
isopropyl alcohol.
3. Reassemble in the logical reverse order and heed the following notes:
a. When reassembling, be sure to put on the ac shield after the main
pcb has been placed in the case bottom. The reason for this is that
the screw which holds down the ac shield has a spring attached. The
spring provides the electrical connection between the top of the ac
shield and the bottom of the shield (under the insulator). If the ac
shield is attached to the main pcb before the main pcb is in the case,
the spring may fold across the insulator and not be in p roper
position to make the electrical connection.
b. Be sure to place the green power switch cap over the small black
power switch before sliding the main pcb into the case.
c. Be sure to route the battery-clip wires to the left side of the post
under the backup fuse case.
4-8. LCD and Microcomputer PCB Disassembly and
Assembly
Note
This procedure applies to models with s/n 4025xxx and higher.
The procedure for disassembling or assembling the LCD and the
microcomputer pcb is not difficult, but the steps must be followed in
sequence. Before you try the procedure, examine the components in Figure
4-2 and familiarize yourself with the following handling precautions:
• The microcomputer, U5 (item 4 in Figure 4-2), is a static sensitive
CMOS device. Follow standard p r ocedures for handling static sensitive
devices.
Maintenance
General Information
4
4-9
Shock Absorber
LCD Interconnect
Microcomputer PCB
CAUTION:
Use tweezers to insert.
Do not handle with fingers.
Microcomputer
Interconnect
Insert edge
under retainer
LCD Plate
(Do not remove)
LCD Bracket
LCD Support
Display Lens
Serial # effectivity. 3995000
Gasket
Align, then push down
and snap into place.
CAUTION:
Use tweezers to insert.
Do not handle with fingers.
CAUTION:
Static Sensitive.
LCD Display
dy33c.eps
Figure 4-2. Assembling/Disassembling the Microcomputer PCB and
LCD
8062A
Instruction Manual
4-10
• The LCD interconnect (item 7) and the microcomputer interconnect
(item 5) should not be to uched with fingers or contaminated. Handle
these items with tweezers and keep them clean.
• The microcomputer interconnect (item 7) is susceptible to corrosion
caused by the reaction between the metal in the connector and possible
contaminates in the air such as smoke or sulfur. Store the connector in
an air-tight container if the LCD is disassembled for a long period of
time.
• Do not get fingerprints or dirt on the LCD display, the display lens, or
the gasket.
• While the LCD and microcomputer pcb are assembled, take care not to
press down on the display lens because pressure could damage the LCD.
To disassemble the LCD, use your thumbnails and push on the corners of the
LCD display, gasket, and display lens so that all three components slide out
together as shown in Figure 4-3.
Note
It is not necessary to remove the main pc b from the botto m case to
disassemble or rea ssemble the LCD.
To assemble the LCD, use the following procedure:
1. Align the LCD display (item 8) as indicated in Figure 4-2 and slide it
into place. The bottom edge of the LCD display should compress the
LCD interconnect (item 7) and slide underneath the two plastic notches
on the LCD bracket (item 1).
2. Refer to Figure 4-2 and follow steps 9 and 10 to complete assembly.
Push corners with thumbnails.
Slide Out
dy34c.eps
Figure 4-3. Disassembling the LCD
Maintenance
General Information
4
4-11
To disassemble the microcomputer pcb, use the following procedure:
1. Turn the main pcb face down and remove the two small screws at the
top of the pcb to free the microcomputer pcb.
2. Refer to Figure 4-2. Beginning with item 7, remove items 7 through 3
(leave item 2 attached to item 1). Be sure to observe the handling
precautions for items 7, 5, and 4.
To assemble the micro computer LCD, refer to Figure 4-2. Beginning with
item 3, assemble ite ms 3 thr ough 7 (in a s cending numerical order). Be sure
to follow the handling precautions for items 4, 5, and 7.
4-9. Backup Fuse Replacement
Use the following procedure to replace the backup fuse (F2):
1. Remove the top cover by following the precautions given previously for
the calibration and backup fuse access.
2. Use a flat-tipped screwdriver to pry the fuse out of its fuse holder. Pry
the fuse from the side as indicated in Figure 4-1.
3. Replace the defective backup fuse with a 3A/600V type BBS-3 (Fluke
PN 475004). Refer to section 2-4 for information about replacing fuse
F1 (2A/250V; American style: fast acting type AGX2 1/4 x 1”, Fluke
PN 376582; European style: 5 x 20 mm, Fluke PN 460972).
4-10. Cleaning
Clean the front panel and case with a damp cloth and mild detergent. Do not
use abrasives, solvents, or alcohol.
Warning
To avoid electrical shock, remove test leads and any
input signals before cleaning.
8062A
Instruction Manual
4-12
4-11. Performance Tests
The following procedures allow you to compare the performance of your
instrument with the specifications listed in Chapter 1. They are
recommended for incoming inspection, periodic calibration, and to verify
specifications. If the instrument fails any test, calibration adjustment and/o r
repair is needed. Yo u do not have to disassemble the instrument to perform
the tests. Throughout these proced ures, the 8062A being tested is referred to
as the UUT (Unit Under Test).
4-12. Initial Procedure
For any of these tests, make sure you do the following:
1. Allow the temperature of the UUT to stabilize in a test environment with
an ambient temperature of 23 ±5°C (73 ±9°F) and a relative humidity of
less than 80%
2. Check the fuses and battery and replace them, if necessary.
3. Make sure the leads are disconnected from the UUT. Set the power
switch to on and set all other switches to the out (off) positions.
4-13. Microcomputer and Display Test
Use the automatic power-on self-test to test the microcomputer and the LCD
display. Turn the UUT off, then turn it on while observing the display. All of
the LCD segments should turn on. After about one or two seconds, the
display should go blank briefly and then respond to switch selections.
Maintenance
Performance Tests
4
4-13
4-14. Voltage Test
Use the following procedure to verify proper operation of the dc and ac
voltage func tions.
1. Connect the UUT and the DMM Calibrator as shown in Figure 4-4.
2. For each step in Table 4-2, select the UUT function and range as
indicated. Program the DMM Calibrator for the specified inp ut signal
and verify that the displayed UUT value is within the indicated limits.
Table 4-2. Voltage Test
Step Function Range Input Signal Display
Level Freq. Limits
1
2
3
4
5
6
DC Voltage 200 mV
200 mV
2V
20V
200V
1000V
+ 190.00 mV
-190.00 mV
1.9000V
19.000V
190.00V
1000V
dc +189.90 to 190.11
-189.89 to -190.11
1.8989 to 1.9011
18.985 to 19.015
189.85 to 190.15
999.1 to 1000.9
7
8AC Volt age 200 mV 100.00 mV rms 200 Hz
20 kHz 99.40 to 100. 60
98.60 to 101.40
9
10
11
12
13
14
15
AC Volt age 2V 1.0000V rms
1.0000V rms
1.0000V rms
1.0000V rms
1.0000V rms
200.0 mV rm s
200.0 mV rm s
200 Hz
1 kHz
10 kHz
30 kHz
20 kHz
200 Hz
30 kHz
.9940 to 1.0060
.9930 to 1.0070
.9930 to 1.0070
.9860 to 1.0140
.9890 to 1.0110
.1978 to .2022
.7940 to .2060
16
17
18
AC Volt age 20V 10. 000V rms
10.000V rms
10.000V rms
200 Hz
10 kHz
30 kHz
9.940 to 10.060
9.480 to 10.520
9.460 to 10.540
19
20
21
22
23
AC Volt age 200V
200V
200V
750V
750V
100.00V rms
100.00V rms
100.00V rms
750.0V rms
750.0V rms
200 Hz
10 kHz
30 kHz
100 Hz
1 kHz
99.40 to 100.60
94.80 to 105.20
94.60 to 105.40
734.0 to 766.0
734.0 to 766.0
8062A
Instruction Manual
4-14
2000mA
A
ACOMMON V Ω S
VΩS
200mA 200 200k
200µA
DC
AC
200mV 200Ω
20mA 20 20k
2mA 22k
1000 DC
750 AC MΩ
REL
1000V DC
750V AC
MAX
2A MAX 500V MAX
!
!
DMM
Calibrator
HI
UUT
LO
dy35f.eps
Figure 4-4. General Equipment Connection
4-15. Resistance Test
Use the following procedure to verify proper operation of the resistance
function:
1. Connect the UUT and the DMM Calibrator as shown in Figure 4-4.
2. Select the r e sistance function and follow the steps 1 through 7 as listed
in Table 4-3. For each step, select the UUT function and range as
indicated. Program the DMM Calibrator for the specified inp ut signal
and verify that the displayed UUT value is within the indicated limits.
Note
Most DMM Calibrators do not test resistance values beyond 10
M
Ω
. To test the resistance function beyond 10 M
Ω
(optional steps 8
and 9 in Table 4-3), disconnect the DMM Calibrator and connect a
precision Reference Resistor for each value.
Maintenance
Performance Tests
4
4-15
Table 4-3. Resistance Test
Step Range Input Resistance Display Limits
1
2
3
4
5
6
7
8 (optional)
9 (optional)
200Ω
200Ω
2 kΩ
20 kΩ
200 kΩ
MΩ
MΩ
MΩ
MΩ
short circuit
100.00Ω
1.0000 kΩ
10.000 kΩ
100.00 kΩ
1.0000 MΩ
10.00 MΩ
40.0 MΩ
290 MΩ
0.00 to 0.04
99.86 to 100.14
.9988 to 1.0012
9.988 to 10.012
99.88 to 100.12
.9978 to 1.0022
9.95 to 10.05
39.3 to 40.7
282 to 298
4-16. Continuity Test
Use the following procedure to verify proper operation of the continuity
function:
1. Connect the UUT and the DMM Calibrator as shown in Figure 4-4.
2. Select the resistance function and the 2 kΩ range. Press the
button once. The symbol should appear on the display.
3. Apply a resistance of 100.0Ω. The long bar across the top of the display
should appear on the display immediately. A reading of .0997 to .1003
should appear shortly thereafter (negating any test lead resistance).
4. Press the button to enable the audible continuity (the 100.0Ω
still applied). The R symbol should appear on the display with the
symbol. The tone should sound.
5. Remove the connections to the input of the UUT . The tone should stop
and the bar should disappear from the display. The display should
indicate OL (overrange) along with the and R symbols.
4-17. Current Test
Use the following precautions to verify proper operation of the dc and ac
curre nt functions:
1. Connect the UUT and the DMM Calibrator as shown in Figure 4-5.
8062A
Instruction Manual
4-16
2. For each step in Table 4-4, select the UUT function and range as
indicated. Program the DMM Calibrator for the specified inp ut signal
and verify that the displayed UUT value is within the indicated limits.
2000mA
A
ACOMMON V Ω S
VΩS
200mA 200 200k
200µA
DC
AC
200mV 200Ω
20mA 20 20k
2mA 22k
1000 DC
750 AC MΩ
REL
1000V DC
750V AC
MAX
2A MAX 500V MAX
!
!
DMM
Calibrator
HI
UUT
LO
dy36f.eps
Figure 4-5. Equipment Connection for Current Test
Table 4-4. Current Test
Step Function Range Input Signal Display
Level Freq. Limits
1
2
3
4
5
6
7
Current dc
200 µA
200 µA
2 mA
20 mA
200 mA
2000 mA
2000 mA
190.00 µA
-190.00 µA
1.9000 mA
19.000 mA
190.00 mA
1900.0 mA
-1900.0 mA
dc
dc
dc
dc
dc
dc
dc
189.41 to 190.59
-189.41 to -190.59
1.8941 to 1.9059
18.941 to 19.059
188.65 to 191.35
1886.5 to 1913.5
-1886.5 to -1913.5
8 Current ac 20 mA rms 19.000 mA 1 kHz 18.848 to 19.152
Maintenance
Calibration Adjustments
4
4-17
4-18. Diode Test
Use the following procedure to verify proper operation of the diode test:
1. Remove any connections to the inputs of the UUT and select the diode
test function. The display should indicate OL (overrange).
2. Connect the UUT and the DMM Calibrator as shown in Figure 4-4 and
apply a resistance of 1.000 kΩ. A reading of .9000 to 1.1000 (typical)
should appear on the UUT display.
4-19. Calibration Adjustments
Under normal operating conditions the 8062A should maintain the
specifications given in Chapter 1 of this manual for at least one year after
calibration. If your 8062A has been repaired or if it has failed any of the
performance tests, you need to perform the calibration adjustments.
Test equipment needed for the adjustments are listed in Table 4-1. If the test
equipment is not available, your nearest Fluke Service Center will be glad to
help. Call (toll-free) 800-426-0361 for assistance. After you have completed
the calibration adjustments, we recommend that you complete the
performance tests to verify proper operation. In the following procedure, the
8062A that is being adjusted is referred to as the UUT (Unit Under Test).
Note
The top ac shield should remain installed in the instrument while
the calibration adjustments are being performed. The positions of
the trimpots and trimcaps are marked on the top ac shield along
with a table summarizing the calibration procedures.
Note
The performance of the 8062A ac functions is affected by the
capacitance between the main pcb and the bottom ac shield, which
is dependent on the distance between them. The distance may vary,
depending on whether the top cover is installed. To minimize
performance variations, make certain the intstrument is firmly
seated in the bottom case befo re making any calibration
adjustments. After you have performed the adjustments and
installed the top cover, if you fin d that the measurement values
obtained for the ac function performance tests are consistently too
high or too low, remove the top cover and repeat the adjustments
accordingly.
8062A
Instruction Manual
4-18
1. Allow the UUT to stabilize with the power off for at least 30 minutes at
an ambient temperature of 21 to 25°C (70 to 77°F).
2. Complete the calibration access procedure presented earlier in this
chapter.
3. Connect the equipment as shown in Figure 4-4 and turn on the
equipment.
4. On the UUT, select the dc voltage function and the 2 volt range. Turn
R6 fully clockwise (CW), and turn R5 fully counterclockwise (CCW).
5. Program the DMM Calibrator for an input of 1.9000V dc. Adjust R5 for
a display reading slightly greater than 1.9000. Adjust R6 for a display
reading between 1.8999 and 1.9001.
6. On the UUT, select the 200 mV range (dc voltage function).
7. Program the DMM Calibrator for an input of 190.00 mV dc. Adjust R8
for a display reading between 189.99 and 190.01.
8. On the UUT, select the ac voltage function and the 200 mV range. Turn
R18 full CW and turn R15 fully CCW.
9. Program the DMM Calibrator for an input of 100.00 mV ac at 200 Hz.
Adjust R15 for a display reading slightly greater than 100.00. Adjust
R18 for a display reading between 99.95 and 100.05.
10. On the UUT, select the 200V range (ac voltage function). Program the
DMM Calibrator for an input of 100.00V ac at 10 kHz. Adjust C3 until
the display reading is between .9990 and 1.0010.
11. On the UUT, select the 2V range (ac vo ltage function). Program the
DMM Calibrator for an input of 1.0000V ac at 10 kHz. Adjust C7 until
the display reading is between 0.9990 and 1.0010.
12. Steps 10 and 11 interact. Repeat bo th steps until the appropriate limits
are obtained for both steps.
Maintenance
Troubleshooting
4
4-19
4-20. Troubl eshooti ng
Caution
0
Static discharge can damage MOS components U3, U4,
and U5. Follow the handling precautions for static
sensitive devices previously described in this chapter.
Never remove, install or otherwise connect or disconnect
components without first setting the instrument power
switch off and disconnecting any inputs to the
instrument.
If necessary, refer to Chapter 2 for operating instructions or Chapter 3 for the
theory of operation. The troubleshooting information is supported by the
schematics and tables in Chapter 7.
4-21. Self-Tests
The 8062A offers three self-tests: power-on self-test, ratio self-test, and
switch decoding self-test. The power-on self-test is automatically performed
whenever the instrument is turned on. It is described in Chapters 2 and 3.
The other two tests function as follows:
4-22. Ratio Self-Test
The ratio self-test is an operating mode of the 8062A in which the reference
voltage for the a/d converter is applied to the a/d converter during both the
integrate and the read periods. If the instrument is functioning pr operly, the
display should read 10000 ± 10 counts (the decimal point location depends
on the range, and does not affect the number of counts).
To select the ratio self-test, select a voltage or current function. Ho ld down
the button while you turn on the instrument. After the power-self-test
has been completed (the display is .8.8.8.8) release the button. The
instrument should now be in the ratio self-test mode. To cancel the ratio self-
test, press the butto n or turn off the instrument.
If the count is within tolerance, it gives a strong indication that the a/d
converter is working properly. If the count deviates more than 5 counts from
10000, the probable causes are as follows ( in order of probability): a/d
converter in U3, leakage around or failure of C16, C18, Z3, R8, or the power
supply.
8062A
Instruction Manual
4-20
4-23. Switch Decoding Self-Test
To select the switch decoding self-test, hold down the REL button while you
turn on the instrument. After the power-on self-test has been completed (the
display is .8.8.8.8), release the REL button. The instrument should now
indicate the switch decoding. To cancel the switch decoding self-test, turn off
the instrument.
The switch decoding self-test indicates how the software in the
microcomputer interprets the configuration of the eight switches and four
push buttons. Each function or range that may be selected corresponds to a
number that appears in one of the digit positions on the display (see Table 4-
5). Notice that if no range is selected, the microcomputer assumes the 200
(µA, mV, Ω) range is selected.
In some cases it may helpful to know that the microcomputer scans the
switches in order from SW5 to SW8 (there is no input for switch SW4, the
default range). The microcomputer assumes the first range switch detected as
being pushed in is the desired range. For example, if you press in both the
200V and 1000V switches while in dc voltage, the microcomputer assumes
you want the 200V range. There is one exception: if the microcomputer
detects that the 2 kΩ switch is selected, it checks for the 20 kΩ switch which
indicates diode test selection when pushed in.
Also during the switch decoding self-test, the continuity indicator (the long
bar across the top of the display) indicates the state of the continuity
comparator. When the voltage at U3-4 (CM-) is less than at U3-3 (CM+), the
continuity indicator is on. When the voltage at U3-4 is greater than at U3-3,
the continuity indicator is off. You can use this feature to check the
comparator when troubleshooting the continuity function. R9 controls the
setting of the comparator offset.
Maintenance
Troubleshooting
4
4-21
Table 4-5. Switch Decoding Self-Test
Range Display Digit 0*
200 (µA, mV or Ω)
2
20
200
2000
0 (default if no range selected)
1
2
3
4
Push Button Display Digit 1*
none
REL 0
1
2
Function Display Digit 3*
AC Voltage
DC Voltage
AC Current
DC Current
Resistance
Diode Test
1
2
3
4
5
7
*Display digits are numbered 0 through 4 from right (LSD ) to left (MSD).
4-24. Troubleshooting Guide
A troubleshooting guide is presented in Table 4-6. The guide is structured
around the performance tests presented earlier in this chap ter. To use this
guide, complete the performance tests and note any discrepancies in
performance. Then locate the test, symptom, and possible cause of
malfunction in Table 4-6. When several possible causes of malfunction are
listed, they are listed in order beginning with the most prob a ble to the least
probable. A section abut troubleshooting the power supply is also included.
The following troubleshooting techniques can be helpful:
• When troubleshooting, remember to use the switch decoding self-test to
determine whether the microcomputer prop erly interprets the function
and ra nge selection.
• Do not remove the main pcb from the bottom case unless you must do so
to gain electrical access to circuits. You can gain electrical access to
almost all of the input ci rcuitry through the switch contact pins on the
top of the switch deck (refer to the schematic in Chapter 7) .
8062A
Instruction Manual
4-22
• One way to check the input circuitry is to attach a high impedance
(>1000 MΩ) DMM at the input of the 8062A a/d converter, U3-6.
• You can do a lot of troubleshooting without the LCD and
microcomputer pcb installed. Although there will be no display and the
a/d converter will not work, the power supplies still work so you can
check the input circuitry, the diode test and ohms sources, and the ac
converter. Another advantage is that you gain access to all the pins on
U3 without having to turn the main pcb over.
• You can troubleshoot the input circuitry with U3 removed (be sure to
disconnect the battery before removing U3). Since U3 controls the
power supply, removing U3 will cause the ac converter and diode test
source to stop working. However, it will also eliminate any power
supply leakages that might be affecting the input circuitry. Since the
input protection, input divider and ohms reference resistors, amps
prot ection, current shunts, and a/ d input circuits consist of passive
components (refer to the schematic in Chapter 7) you can check them
without having U3 installed.
Table 4-6. Troubleshooting Guide
Test and Symptom Possible Cause/Suggestions
Power On/Microcomputer and
Display Test
No display Dead battery, battery connections,
J4, power supply circuitry.
Missing LCD segments Display interconnect.
All LCD segments stay on Microcomputer connector, U5, U3,
pcb lands open.
Entire display is dim Low battery, power supply low,
display interconnect.
Some display segments are
dim or ghosting Display interconnect, contamination
on pcb connector or LCD.
Power Supply
VDD (voltage between
TP7 and common)
≠5.2 ±0.12V
U3, Q1, VR1
Maintenance
Troubleshooting
4
4-23
Table 4-6. Troubleshooting Guide (cont)
Test and Symptom Possible Cause/Suggestions
Power Supply (cont)
VDG (voltage between
TP7 and TP8)
≠3.15 ±0.08V
U3, C12, U5
VSS (voltage between
TP2 and common)
≠-5.1 ±0.27V
U4, C21, C23
TP4 ≠1.225 ±0.025V
U3-11 ≠1.0000 ±0.0004V
Hint: if you suspect U3 power
supplies are bad, you can drive the
8062A power supplies externally.
Remove battery, µC pcb, and U3.
Apply +5.2V at TP1 you can then
check the ac converter, diode test
source, VR2, U4, and the power
supply circuitry.
Voltage Test - DC
Gross error (constant
reading of 0.00 or OL) Perform ratio self-test in dc volts. If
count is good, U3 is good. If count is
way off, suspect U3, C9, R33, R8,
Z3, C16 or C18
Rati o self -test passes,
but constant reading
of 0.00
R1, R2 (fusible resistors replace
with exact equivalent only). RJ1, RJ2,
RJ3, RJ4 (varstors turn yellow when
shorted), open circuit in front end,
bad component is input divider, U3
pins 6 and 7 shorted. (Hint: check
high impedance dc voltage first,
which bypasses the input divider.)
Refer to Table 4-1 for input divide
ratios.
8062A
Instruction Manual
4-24
Table 4-6. Troubleshooting Guide (cont)
Test and Symptom Possible Cause/Suggestions
Voltage Test - DC (cont)
High impedance dc readings
0.00, normal dc
readings correct
R1
DC readings incorrect for
all ranges Leakage from pcb, U3-6/7,
contamination
DC readings correct for
200 mV, 2Vincorrect
for 20V, 200V, 1000V
Input divider or input divider switches,
R2
Voltage Test - AC
DC reading correct,
ac readings incorrect Switches S3D, S3B
Check power supply connections
J13 Vss
J7 Com
J12 Vdd
Resistance Test
All ranges incorrect Ohms source voltage inadequate -
using a voltmeter in the 2V or 20V
range, measure ohms source voltage
between TP11 and common. Refer to
Table 4-7 for correct values.
Q3, Q4, RT1, R2, R1, Z5
All ranges incorrect CR1 not supplying enough current
(particularly if 200Ω range noisy).
Select diode test, connect an external
1 kΩ resistor across the inputs and
measure the voltage drop across the
resistor - should be approximately 1V
(±10%).
CR1 supplying proper current,
but reading off Check values of the reference
resistors for the range not working.
Check voltage drops across the
known and unknown resistors and
make sure the ratio works properly.
Maintenance
Troubleshooting
4
4-25
Table 4-6. Troubleshooting Guide (cont)
Test and Symptom Possible Cause/Suggestions
Resistance Test (cont)
Low range readings correct,
high range readings off Q3 and Q4 leak-check by seeing if
MΩ reads OL with open input. Main
pcb contaminated - clean carefully
and check performance.
Current Test
Constant reading of 0.00 Check fuses F1 and F2 with fuse
check procedure in Chapter 2-4.
Fuses F1 and F2 good, but
current readings off Switches and resistors in current
shunt.
High crest-factor ac current
readings off U1
Continuity Test
No response Select switch decoding self-test
check for proper function decoding
and also confirm that the continuity
comparator responds. R31, S1A
No tone Q6, R4, LS1. Check U3-1 (tone
output) with scope for 2.667 kHz
signal.
Diode Test
No readings or very low
readings CR1 (diode test source). To check
CR1, select diode test, connect an
external 1 kΩ resistor across the
inputs and measure the voltage
acro ss the resistor should be
approximately 1V (±10%).
BT Indicator
BT indicator not displayed
when battery voltage is
less that 5.6V
U3, Z4-U3 compares voltage at pin
18 (BT1) with voltage at pin 10
(COM-analog common voltage). BT
turns on if U3-18 voltage is greater
than common. turns off if it is less
(±50 mV)
8062A
Instruction Manual
4-26
Table 4-7. Troubleshooting the Resistance Function: Voltage Sources
for Ranges
Range Voltage Source
(±10%) Comment
200Ω
2 kΩ
20 kΩ
200 kΩ
MΩ
4.5V
1.2V
1.2V
1.2V
2.1V
These values should be obtained when
no external resistors are connected to
the resistance inputs. Measure voltage
between common (J2) and TP10. Note
that the MΩ and 200 kΩ ranges will be
loaded by a 10 MΩ input impedance.
Use a high impedance voltmeter for the
measurement or decrease the voltage
source magnitude appropriately. A DMM
with a 10 MΩ input impedance will read
approximately 1.9V in the MΩ range.
Table 4-8. U3 (MAC) Pin Descriptions
Pin No. Mnemonic Description
1 Tone 2.66 kHz square wave to tone generator.
2
3
4
CFO
CM+
CM-
Output, + input, - input, respectively, of the
continuity function comparator.
5
6
7
VSS
HI
LO
-5.1V supply (externally generated).
Input to the a/d converter.
Sense ground for the a/d converter.
8
9FC+
FC- Connections to the “flying capacitor” which
stores the reference voltage applied to the a/d
converter during the read period. Plus and
minus signs indicate polarity of stored voltage.
10
11
COM
VREF+
Analog common.
Input for 1V reference voltage for a/d converter
and power supply.
Maintenance
Troubleshooting
4
4-27
Table 4-8. U3 (MAC) Pin Descriptions (cont)
Pin No. Mnemonic Description
12
13 OREF-
OREF+ Reference input to a/d converter during
autozero period for resistance functions.
14
15 BFH
BFL Output of the a/d buffer circuit.
16
17
18
19
20
21
22
23
AZ
INT
BTI
VIA
CV
VDD
VID
VDG
Input for AZ capacitor.
Input for INTEG capacitor.
Battery test input.
+5.2V supply feedback (nominally 1V)
Gate drive for JFET. Series pass element
+5.2V supply.
Reference voltage for the U3 and U5 digital
power supply.
Output of the U3 and U5 digital power supply.
24
25
26
27
AD0
AD1
AD2
AD3
Four-bit parallel data bus between U3 and U5.
During the first part of a data transfer operation
they carry the address of the register being
read or written to. During the remainder of the
operation they carry data.
28
29
30
WR/
ALE/
RD/
Register write strobe.
Address Latch Enable.
Register read strobe.
31
32
33
34
35
36
37
IN10
IN11
IN12
IN13
IN20
IN21
IN22
SW5
SW6
SW7 Inputs to U5 indicating the switch
SW8 positions.
SW1
SW2
SW3
38 CLKO 40 kHz clock which drives the U5 clock input
(crystal frequency divided by 80).
39
40 XTALI
XTALO Connections to the crystal oscillator.
8062A
Instruction Manual
4-28
5-1
Chapter 5
List of Replaceable Parts
Contents Page
5-1. Introduction...................................................................... 5-3
5-2. How to Obtain Parts ......................................................... 5-3
5-3. Manual Status Information............................................... 5-4
5-4. Newer Instruments............................................................ 5-4
5-5. Service Centers................................................................. 5-4
8062A
Instruction Manual
5-2
List of Replaceable Parts
5
5-3
5-1. Introduction
This section contains an illustrated list of replaceable parts for 8062A True
RMS Multimeters. Parts are listed by assembly; alphabetized by reference
designator. Each assembly is accompanied by an illustration showing the
location of each part and its reference designator. The parts lists give the
following information:
• Refere nce designator
• An indication if the part is subject to damage by static
discharge
• Description
• Fluke stock numbe r
• Total q uantity
• Any special notes (i.e., factory-selected part)
Caution
A * symbol indicates a device that may be damaged by
static discharge.
5-2. How to Obtain Parts
Electrical components may be ordered directly from the manufacturer by
using the manufacture rs part number, or from the Fluke Corporation and its
authorized representatives by using the part number under the heading
FLUKE STOCK NO. In the U.S., order directly from the Fluke Parts Dept.
by calling 1-800-526-4731. Parts price information is available from the
Fluke Corporation or its representatives. Prices are also available in a Fluke
Replacement Parts Catalog which is available on request.
In the event that the part ordered has been replaced by a new or improved
part, the replacement will be accompanied by an explanatory note and
installation instructions, if necessary.
To ensure prompt delivery of the correct part, include the following
information when you place an order:
• Part numbe r and revision level of the pca co ntaining the part.
• Refere nce designator
• Fluke stock numbe r
• Description (as given under the DESCRIPTION heading)
• Quantity
• Instrument Model, Serial Number, and Firmware Numbers
8062A
Instruction Manual
5-4
5-3. Manual Status Information
The Manual Status Information table that precedes the parts list defines the
assembly revision levels that are doc umented in the manual. Revision levels
are printed on the component side of each pca.
5-4. Newer Instruments
Changes and improvements made to the instrument are identified by
incrementing the revision letter marked on the affected pca. These changes
are documented on a manual supplement which, when applicable, is included
with the manual.
5-5. Service Centers
To locate an authorized service center, call Fluke using any of the phone
numbers l isted below, or vi sit us on the World Wide We b: www.fluke.com
1-800-44-FLUKE (1-800-443-5853) in U.S.A and Canada
31 40 267 8200 in Europe
1-425-356-5500 from other countries
Note
This instrument may contain a Nickel-Cadmium battery. Do not mix with the
solid waste stream. Spent batteries should be disposed of by a qualified
recycler or hazardous materials handler. Contact your authorized Fluke
service center for recycling information.
Warning
This instrument contains two fusible resistors (pn
474080). To ensure safety, use exact replacement only.
List of Replaceable Parts
5
5-5
Manual Status Information
Ref or
Option No. Assembly Name Fluke Part
No. Revision
Level
A1
A2
A3
Main PCB Assembly
Digital PCB Assembly
RMS PCB Assembly
865808
538306
609120
L
C
Table 5-1. 8062A Final Assembly
Ref.
Des. Description PN Qty Notes
A1 * MAIN PCB ASSEMBLY 865808 1
A2 * DIGITAL PCB ASSY 538306 1 1
BT1 BATTERY,9V,0-15MA 696534 1
F1
W
FUSE,.25X1.0,2A,250V,FAST 376582 2
W
F2
W
FUSE,.406,1.375,3A,600V,FAST 475004 1
W
H1 SCREW,PH,P,AM THD FORM,STL,4-14./375 448456 2
H2 SCREW,PH,P,THD FORM,STL,7-19,.750 447953 3
H3 SCREW,FH,P,STL,6-32,.375 837682 1
H4 WASHER,COUNTER SUNK,STAINLESS STEEL 614529 1
MP1 BAIL-STAND, MED PEWTER 616961 1
MP2 BRACKET,LCD MOUNTING 795112 1
MP10 TOP SHIELD 604801 1
MP3 BUTTON,FUNCTION SWITCH-DK PEWTER 606889 3
MP4 BUTTON, POWER SWITCH 456491 1
MP5 BUTTON,RANGE SWITCH-DK UMBER 606871 5
MP6 CASE,BOTTOM, M ED PEWTER (CE) 664984 1
MP7 CASE,TOP 8060A MODIFIED (573980) 638635 1
MP8 COVER, BATTERY,MED PEWTER 649126 1
MP9 DECAL, TOP CASE 604785 1
MP11 FLANGE, SWITCH 455881 1
MP12 FOOT, NON-SKID 604397 4
MP13 GASKET, LCD 605170 1
MP14 CONN,ELASTOMERIC,LCD TO PWB,2..153 L 783191 1
MP15 CONN,ELASTOMERIC,LCD TO PWB,2.153 L 587014 1
MP17 LENS 612747 1
8062A
Instruction Manual
5-6
Table 5-1. 8062A Final Assembly (cont)
Ref.
Des. Description PN Qty Notes
MP19 PLATE, LCD 612762 1
MP21 INSULATOR, SHIELD 604777 1
MP22 SHIELD, LOWER 587048 1
MP23 SHOCK ABSORBER,LCD 605188 1
MP24 SHOCK ABSORBER 428441 1
MP25 SPACER, CASE 458588 2
MP27 SUPPORT, LCD 612754 1
MP28 SUPPORT, TOP SHIELD 612770 1
MP39 TEST LEAD ASSY, TL70A 855820 1
MP40 BUTTON,FUNC,SW,DK PEWTER, MODIFIED 930347 1
S10 SWITCH, ELASTOMERIC 2 POSITION 604827 1
TM1 8062A INSTRUCTION MANUAL 609153 1
TM2 8062A OPERATOR GUIDE 632703 1
TM3 DMM ACCESSORY GUIDE 825851 1
U3 FINAL TESTED PLASTIC PKG-8060 704759 1 2
U6 LCD, 4.5 DIGIT, MULTIPLEXED 800003 1
W1 GROUND STRIP,BECU,1.980+-.035 817254 1
1. THIS ASSEMBLY IS NON-REPAIRABLE. ENTIRE ASSEMBLY M U ST BE REPLACED.
2. THIS COMPONENT IS INSTALLED ON A2 ASSEMBLY.
3. RECOMMENDED SPARE PARTS KIT, PN 646885.
W
TO ENSURE SAFETY, USE EXACT REPLACEMENT ONLY.
List of Replaceable Parts
5
5-7
Test & Button Up
(1 of 2)
dy37c.eps
Figure 5-1. 8062A Final Assembly
8062A
Instruction Manual
5-8
Test & Button Up
(2 of 2)
dy38c.eps
Figure 5-1. 8062A Final Assembly (cont)
List of Replaceable Parts
5
5-9
Table 5-2. A1 Main PCB Assembly
Ref.
Des Description PN Qty Notes
A3 * RMS PCB ASSEMBLY 609120 1
C1,C023,
C32,C34 CAP,AL,100UF,+-20%,6.3V,SOLV PROOF 615906 4
C2 CAP,CER,8PF,+-0.25PF,1000V,C0H 643551 1
C3 CAP,VAR,0.25-1.5PF,1700V,TEFLON 218206 1
C4 CAP,CER,47PF,+-2%,100V,C0G 832295 1
C5 CAP,CER,0.01UF,+-2%,50V,C0G 631044 1
C6 CAP,CER,820PF,+-2%,50V,C0G 631002 1
C7 CAP,VAR,3-11PF,100V,CER 641712 1
C9,C18 CAP,POLYPR,0.22UF,+-10%,160V 446799 2
C10,C14 CAP,CER,0.01UF,+-20%,50V,Z5U 659045 2
C11,C15 CAP,CER,0.22UF,+-20%,50V,Z5U 831982 2
C12,C21 CAP,AL,10UF,+-20%,16V,SOLV PROOF 602326 2
C13,C30,
C37 CAP,CER,0.01UF,+-20%,50V,X7R 816249 3
C16 CAP,TA,1UF,+-20%,35V 161919 1
C17 CAP,POLYES,0.01UF,+-10%,1000V 822361 1
C22 CAP,POLYPR,0.1UF,+-10%,160V 446781 1
C29 CAP,CER,68PF,+-2%,100V,C0G 362756 1
C36 CAP,AL,22UF,+-20%,16V,SOLV PROOF 614750 1
CR1 * I-REG DIODE,1MA,10%,SEL,TO-226 334839 1
CR2 DIODE,SI,100V,1A,DO-41 698555 1
CR3,CR4 * DIODE,SI,75V,150MA,DO-35 659516 2
J1-3 RECEPTACLE 508606 3
J4 ACK,PWB,RT ANG 423897 1
J5 CONTACT ASSY TERMINATION 651653 1
J6-8,
J10-14 PIN,SINGLE,PWB,0.025 SQ 603910 8
LS1 AF TRANSD,PIEZO,22MM,400UW,4KHZ 602490 1
MP1 FUSE CASE 540716 1
MP2 FUSE CLIP 534925 1
MP3 FUSE CLIP 535203 1
MP5 SPACER,SWAGE,.250 RND,BR,6-32,.687 544254 1
MP6 SPRING 535211 1
8062A
Instruction Manual
5-10
Table 5-2. A1 Main PCB Assembly (cont)
Ref.
Des Description PN Qty Notes
MP12-15 SPACER,LED .330 LG 930342 4
Q1 * TRANSISTOR,SI,N-JFET,SEL,TO-92 721936 1
Q3,Q4,Q6 * TRANSISTOR,SI,NPN,60V,310MW,SEL,TO-92 886916 3
Q5 * TRANSISTOR,SI,NPN,30V,1W,TO-92 242065 1
R1,R2 RES,MF,1K,+-1%,100PPM,FLMPRF,FUSIBLE 474080 2 1
R3 RES,CC,100M,+-10%,0.5W 190520 1
R4 RES,CF,5.6K,+-5%,0.25W 442350 1
R5 RES,VAR,CERM,2K,+-20%,0.3W 603753 1
R6 RES,VAR,CERM,200,+-20%,0.3W 603738 1
R7 RES,MF,154K,+-1%,0.125W,100PPM,1206 289447 1
R8 RES,VAR,CERM,1K,+-20%,0.3W 614065 1
R10 RES,MF,3.65K,+-1%,0.25W,100PPM 810754 1
R15 RES,VAR,CERM,3K,+-20%,0.3W 689627 1
R16 RES,MF,383K,+-1%,0.125W,100PPM 288498 1
R18 RES,VAR,CERM,100,+-20%,0.3W 614057 1
R20 RES,CC,220K,+-10%,1W 109652 1
R22 RES JUMPER,0.02,0.25W 682575 1
R31 RES,CF,10,+-5%,0.25W 807669 1
R32 RES,CC,100K,+-5%,1W 641282 1
R34,R35 RES,CF,12,+-5%,0.25W 442178 2
R36 RES,CF,51K,+-5%,0.25W 376434 1
R37 RES,CF,68K,+-5%,0.25W 376632 1
RJ1-4 VARISTOR,430V,+-10%,1.0MA 447672 4
RT1 THERMISTOR,RECT.,POS.,1K,+-40% 446849 1
S1 SWITCH ASSY 535021 1
S9 SWITCH,SLIDE,SPDT,PWB,RA 453365 1
U1 DIODE BRIDGE,SI,50V,1A,DIP 418582 1
U4 * IC,VOLTAGE CONVERTER,10.5 V MA 586248 1
VR1 ZENER,UNCOMP,6.2V,5%,20.0MA,0.4W 325811 1
VR2 * IC, 1.22V,50 PPM T.C.,BANDGAP 508259 1
VR3 ZENER,UNCOMP,12.0V,10%,10.5MA,0.4W 741074 1
W1 WIRE,NONINSUL,JUMPER,.150CTR 643452 1
XU3 SOCKET,IC,40 PIN,DUAL WIPE,RETENTION 756668 1
List of Replaceable Parts
5
5-11
Table 5-2. A1 Main PCB Assembly (cont)
Ref.
Des Description PN Qty Notes
Y1 CRYSTAL,3.2MHZ,+-0.005%,HC-18/U 513937 1
Z1 RNET,MF POLY,SIP,8060 HI V DIVIDER 539213 1
Z2 RES,WW,NET,TOL MATCHED 435727 1
Z3 RNET,MF,POLY,SIP,8060 LO V DIVIDER 611467 1
Z4 RES,CERM,NET,TOL/TC MATCHED 614164 1
Z5 RES,CERM,NET,TOL/TC MATCHED 614149 1
Z6 RNET,CERM,SIP,8060 I SHUNT 737569 1
1. FUSIBLE RESISTOR. T O ENSURE SAFETY, USE EXACT REPLACEMENT ONLY.
8062A
Instruction Manual
5-12
8062A-4031
iv39c.eps
Figure 5-2. A1 Main PCB Assembly
List of Replaceable Parts
5
5-13
Table 5-3. A3 RMS PCB Assembly
Ref.
Des Description PN Qty Notes
C1 CAP,TA,22UF,+-20%,6V,6032 876545 1
C2 CAP,TA,2.2UF,+-20%,6V,3216 930248 1
C3 CAP,TA,10UF,+-20%,6V,3216 105954 1
C4 CAP,CER,0.1UF,+-10%,25V,X7R,0805 942529 1
CR1 *DIODE,SI,DUAL,100V,200MA,SOT-23 821116 1
Q1 *TRANSISTOR,SI,PNP,50V,225MW,SOT-23 820910 1
R1,R2 RES,MF,10K,+-0.1%,.125W,25PPM,1206 106366 2
R3 RES,MF,8.45K,+-0.1%, 0.125W,25PPM,1206 689528 1
R4,R15,
R16 RES,CERM,15K,+-1%,.125W,100PPM,1206 769810 3
R5,R6 RES,CERM,200K,+-1%,0.1W,100PPM,0805 928882 2
R13 RES,CERM,10K,+-1%,.125W,100PPM,1206 769794 1
R14 RES,CERM,10M,+-5%,.125W,300PPM,1206 783274 1
RT1 THERMISTOR,RECT,POS,1.5K,+-30% 822015 1
U1 *IC,OP AMP,BPLR,LOW VOS,PA IB,S08 689224 1
U2 IC,RMS-TO-DC CONVERTER,200 MV,TO-100 604819 1
U3 *IC,OP AMP,FET,PREC,LOW PWR,SNGL S,S08 929828 1
VR1 ZENER,UNCOMP,5.1V,5%,20MA,0.2W 837179 1
VR2,VR3 ZENER,UNCOMP,3.3V,5%,20MA,0.5W 641925 2
8062A
Instruction Manual
5-14
Circuit 1 Ref Des View
Circuit 2 Ref Des View
8060A-4003M
dy60f.eps
Figure 5-3. A3 RMS PCB Assembly
6-1
Chapter 6
Accessory Information
Contents Page
6-1. Introduction...................................................................... 6-3
6-2. Deluxe Carrying Case (C90) ............................................ 6-3
6-3. Temperature Probes (80T-150C and 80T-150F).............. 6-3
6-4. Current Transformer (80I-600)......................................... 6-6
6-5. High Voltage Probe (80K-6)............................................ 6-6
6-6. High Voltage Probe (80K-40).......................................... 6-7
6-7. High Frequency Probe (83RF) ......................................... 6-7
6-8. High Frequency Probe (85RF) ......................................... 6-8
6-9. Current Shunt (80J-10)..................................................... 6 -9
6-10. AC/DC Current Probe (Y8100)........................................ 6-9
6-11. AC Current Transformer (Y8101).................................... 6-10
6-12. Safety Designed Test Lead Set (TL70) ............................ 6-11
6-13. Deluxe Test Lead Set (Y8134)......................................... 6-11
6-14. Slim Flex Test Lead Set (Y8140)..................................... 6-12
6-15. Cables and Adapters......................................................... 6-12
8062A
Instruction Manual
6-2
Accessory Information
Introduction
6
6-3
6-1. Introduction
This chapter of the manual contains information concerning the accessories
available of use with your multimeter. Each accessory, as shown in Figure 6-
1, is d escribed in gener al terms under a separa te major heading containing
the accessory model number. The depth of detail is intended to give the
prospective user an adequate first acquaintance with the features and
capabilities of each accessory. Additional information, when necessary, is
supplied with the accessory.
6-2. Deluxe Carrying Case (C90)
The C90 Deluxe Carrying Case is a pliable, vinyl, zipper-closed pouch that
provides in-field-transpor t protection for the instrument as well as convenient
storage locations for test leads, operator guide and other small accessories. A
finger- or belt-loop is included on the case as a carrying convenience.
6-3. Temperature Probes (80T-150C and 80T-
150F)
The 80T-150 Temperature Probe coverts the instrument into a direct-reading
(1 mV dc/°) °C (80T-150C) or F° (80T-150F) thermometer. It is ideally
suited for surface, ambient, and liquid measurements and lends itself easily
to a wide range of design, troubleshooting, and evaluation applications. A
rugged , fast-respondi ng probe-tip with a 350V dc standoff makes the 80T-
150 one of the most versatile and easy-to-use temperature probes available.
RANGE (°C/°F)
80T-150C........................................
80T-150f ......................................... -50°C to +150°C
-58°F to 302°F
ACCURACY..................................... ± 1 °C ( 1.8°F) from 0°C to 100°C,
decreasing linearly to ± 3°C (5.4°F)
at -50°C and +150°C
VOLTAGE STANDOFF .................. 350V dc or peak ac
POWER............................................. Internal disposable battery; 1,000
hours of continuous use.
8062A
Instruction Manual
6-4
dy55c.eps
Figure 6-1. Accessories
Accessory Information
Temperature Probes (80T-150C and 80T-150F)
6
6-5
dy56c.eps
Figure 6-1. Accessories (cont)
8062A
Instruction Manual
6-6
6-4. Current Transformer (80I-600)
The Model 80I-600 extends the maximum 2A ac current measuring
capability of the instrument up to a maximum of 600 amps. A clamp-on
transformer designed into the prob e allows measurements to be made without
breaking the circuit under test. In use, the current carrying conductor being
measured serves as the transformer’s primary, while the 80I-600 serves as
the secondary. Because of a high efficiency, quadrature type of winding, wire
size and location o f the conductor within the transformer jaws do not affect
the accuracy of the current measurement.
RANGE............................................. 1 to 600A ac
ACCURACY..................................... ±3%
FREQUENCY RESPONSE.............. 30 Hz to 1 kHz, 10 kHz typical
DIVISION RATIO............................ 1000:1
INSULATION................................... 5 kV
MAXIMUM CONDUCTOR SIZE... 2-inch diameter
6-5. High Voltage Probe (80K-6)
The 80K-6 is a high voltage probe designed to extend the voltage measuring
capability of an ac dc voltmeter to 6000 volts. A 1000:1 voltage divider
provides the probe with a high input impedance. The divider also provides
high accuracy when used with a voltmeter having a 10 megohm input
impedance. A molded plastic body houses the divider and protect the user
from the voltage being measured.
VOLTAGE RANGE ......................... 0 to 6 kV, dc or peak ac
INPUT IMPEDANCE....................... 75 megohms ±25 nominal
DIVISION RATIO............................ 1000:1
ACCURACY
DC to 500 Hz ..................................
500 Hz to 1 kHz.............................. ±1%
±2%
Above 1 kHz ..................................... Output reading falls. Typically,
-30% at 10 kHz
Accessory Information
High Voltage Probe (80K-40)
6
6-7
6-6. High Voltage Probe (80K-40)
The Mod e l 80K-40 extends the vo ltage measurement capability of the
instrument up to 40 kV. Internally, the probe contains a special 1000:1
resistive divider. Metal-film resistors with matched temperature coefficients
comprise the divider, and provide the probe with its excellent accuracy and
stability characteristics. Also, a n unusua lly high input impeda nce (1000 MΩ)
minimizes circuit loading, and thereby contributes to measurement accuracy.
VOLTAGE RANGE ......................... 1 kV to 40 kV dc or peak ac, 28 kV
rms ac
INPUT RESISTANCE...................... 1000 MΩ
DIVISION RATIO............................ 1000:1
ACCURACY DC (OVERALL)........ 20 kV to 30 kV ±2% (calibrated at
25 kV)
UPPER LIMIT.................................. Changes linearly from 2% at 30 kV
to 4% at 40 kV
LOWER LIMIT ................................ Changes linearly from 2% at 20 kV
to 4% at 1 kV
ACCURACY AC (OVERALL)........ ±5% at 60 Hz
6-7. High Frequency Probe (83RF)
The 83 RF Probe extend s the freq uency range of your multimeter’s voltage
measurement capability to include 100 kHz to 100 MHz inputs from 0.25 to
30V rms. The probe operates in conjunction with the instrument’s dc voltage
ranges, and provides a d c output that is calibrated to be eq uivalent to the rms
value of a sinewave input.
AC-to-DC RATIO............................. 1:1
RATIO ACCURACY (At 1 MHz
and loaded with 10 MΩ)
Above 1V........................................
Below 1V ........................................ ±1 dB
±1.5 dB
FREQUENCY RESPONSE
(Relative to 1 MHz)
100 kHz to 100 MHz......................... ±1 dB
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Instruction Manual
6-8
EXTENDED FREQUENCY
RESPONSE....................................... Useful for relative readings from 20
kHz to 250 MHz
RESPONSE....................................... Responds to the peak value of an
input and is calibrated to read rms
value of a sine wave.
VOLTAGE RANGE ......................... 0.25 to 30V rms
MAXIMUM INPUT VOLTAGE ...... 30V rms, 200V dc
INPUT CAPACITANCE.................. Approximately 3 pF
TEMPERATURE RANGE
Operating.........................................
Storage ............................................ +10°C to + 35°C
-40°C to +75 °C
HUMIDITY ...................................... <90% R.H.
OUTPUT CONNECTOR.................. Fits standard 0.75-inch dual banana
connectors
6-8. High Frequency Probe (85RF)
The Model 85RF High Frequency Probe allows measurements over a
frequency range of 100 kHz to 500 MHz from .25V to 30V rms. It operates
in conjunction with the instruments dc voltage ranges and provides a dc
output that is calibrated to be equivalent to the rms value of a sinewave input.
AC-to-DC RATIO............................. 1:1
RATIO ACCURACY (At 1 MHz
and loaded with 10 MΩ)
Above 0.5V.....................................
Below 0.5V ..................................... ±0.5 dB
±1.0 dB
FREQUENCY RESPONSE
(Relative to 1 MHz)
100 kHz to 100 MHz.......................
*100 MHz to 200 MHz ...................
*200 MHz to 500 MHz ...................
*Referred to high and low inputs at
probe tip.
±0.5 dB
±1.0 dB
±3.0 dB
EXTENDED FREQUENCY
RESPONSE....................................... Useful for relative readings from 20
Accessory Information
Current Shunt (80J-10)
6
6-9
kHz to 700 MHz
RESPONSE....................................... Responds to the peak value of an
input and is calibrated to read rms
value of a sine wave.
VOLTAGE RANGE ......................... 0.25 to 30V rms
MAXIMUM INPUT VOLTAGE ...... 30V rms, 200V dc
INPUT CAPACITANCE.................. Approximately 3 pF
TEMPERATURE RANGE
Operating.........................................
Storage ............................................ +10°C to + 35°C
40°C to +75°C
HUMIDITY ...................................... <90% R.H
OUTPUT CONNECTOR.................. Fits standard 0.75-inch dual banana
connectors
6-9. Current Shunt (80J-10)
The Model 80J-10 Current Shunt extends the current measuring c apability of
the DMM to 10 amps continuous (20 amps for periods not exceeding one
minute) dc to 10 kHz at an accuracy of ±0.25% in excess of the voltmeter
accuracy.
SHUNT ............................................. 10 amps at 100 mV
ACCURACY (18°C to 2 8°C)
DC to 10 kHz ..................................
10 kHz to 100 kHz .......................... ±0.25%
Rising to 1 dB at 100 kHz typical
TEMPERATURE COEFFICIENT ... 0.005%/°C
INDUCTANCE................................. 18.3 nH in series w/0.01Ω shunt
OVERLOAD..................................... Up to one minute at 20A with a 1/4
duty cycle for recovery after currents
between 10A and 20A.
CONNECTS TO ............................... 3/4 inch center banana jacks
CONNECTORS................................ 5-way binding posts (red and black)
6-10. AC/DC Current Probe (Y8100)
The Fluke Y8100 AC/DC Current Probe is a clamp-on probe that is used
with a voltmeter, multimeter, or oscilloscope to read dc, ac or composite (ac
on dc) current measurements. The jaws on the Y8100 are designed to clamp
8062A
Instruction Manual
6-10
around conductors up to 3/4 inch in diameter. The pistol shape allows safe,
easy, one-hand operation when making current measurements.
The Model Y8100 probe is battery powered with size AA cells. It measures
current to 200A dc or ac rms using most any voltmeter. Two ranges, 20A and
200A, produce a 2V output at full-range current.
RANGES........................................... 20A ac or dc
200A ac or dc
RATED OUTPUT............................. 2V at full range
ACCURACY
DC to 200 Hz ..................................
200 Hz to 1 kHz.............................. ±2% of range
<100A add ±3% reading
>100A add +6% reading
CALIBRATION CYCLE.................. 1 year
FREQUENCY RESPONSE.............. dc to 1.0 kHz
RECOMMENDED LOAD................ ≥3.0 kΩ
TEMPERATURE RANGE............... +15°C to +35°C; for specified
accuracy -10°C to +5 0°C; storage
and operation at reduced accuracy.
HEATING LIMITATION................. Prolonged operation above 200A ac
or 1 kHz can cause damage to the
Y8100.
WORKING VOLTAGE RATING.... Core to output; 600V dc or 480V ac
maximum output to ground; 42V dc
or 30V ac Max.
APERTURE SIZE ............................. 3/4” (19 mm) diameter
SIZE OVERALL............................... 9” x 4-1/2”x 1-7/16” (230 mm x 115
mm x 37 mm)
WEIGHT........................................... 14 ounces (0.4 kg), with batteries
POWER............................................. Battery, four AA cells
BATTERY LIFE............................... Alkaline-20 hours continuous
6-11. AC Current Transformer (Y8101)
The Model Y8101 is a small clamp-on current transformer designed to
extend the current measuring capability of an ac current meter up to 150
amperes. A clamp-on coil designed into the probe allows measurements to
Accessory Information
Safety Designed Test Lead Set (TL70)
6
6-11
be made without breaking the circuit under test. This coil serves as the
secondary of a 1:1000 transformer. The current-carrying conductor being
measured serves as the primary.
CURRENT RANGE ......................... 2A to 150A
ACCURACY, (48 Hz to 10 kHz)...... ±2%, 10A to 150A
±8%, 2A to 10A
DIVISION RATIO............................ 1000:1
WORKING VOLTAGE .................... 300V ac rms max
INSULATION DIELECTRIC
WITHST AND VOLTAGE............... 3 kV rms
MAXIMUM CONDUCTOR SIZE... 7/16” (1.11 cm)
6-12. Safety Designed Test Lead Set (TL70)
The TL70 Test Lead Set includes one red and one black test lead. Each
probe has an anti-slip sho ulder near the test tip and is connected to the
multimeter via a safety-designed shrouded banana connector. This set will fit
Fluke instruments with safety-designed input jacks.
6-13. Deluxe Test Lead Set (Y8134)
The Y8134 is a deluxe test lead set. The attachments provided allow
interconnection with a wide variety of leads and electronic components.
Included in the kit are:
1. Two test leads (one read and one black). The Y8134 leads have a
shrouded banana connectors on each end.
2. Two test probes
3. Two insulated alligator clip s
4. Two spade lugs
5. One squeeze hook
6. One test lead pouch
7. One instruction sheet
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Instruction Manual
6-12
6-14. Slim Flex Test Lead Set (Y8140)
The Y8140 Test Lead Set consists of one red and one black 60-inch (1.52
meter) test lead, each with a standard banana plug on one end and an
extendable tip pr obe on the other end. This flexible metallic tip cond uctor
may be extended up to 2.5 inches and is insulated to within 0.1 inch of its tip.
This insulation reduces the chance of creating an inadvertent short circuit
while using the pro bes in their extended configuration. Intend ed primarily for
measuring voltages, the Y8140 leads may also be used for measuring modest
currents.
6-15. Cables and Adapters
A variety of cables and adapters are available for use with the 8062A, and
are listed in Table 6-1.
Table 6-1. Cables and BNC, Banana, Phone and Phono Plug Adapters
Model Description
Y9105
Y9106
Y9107
Y9108
Y9109
Y9110
Y9111
Y9112
Y9113
Y9114
Y9115
Y9116
Y9117
Y9118
Y9119
Adapter: Insulated alligator clip-banana plug (pkg. of 10)
BNC Tee, jack-jack-jack
BNC Tee, jack-plug-jack
Adapter: BNC-double banana plug
Adapter: Binding post/double banana plug-BNC plug
Adapter: BNC jack-pcb pins
3-foot BNC cable (97 cm), 50Ω RG 58C/U
6-foot BNC cable (1.95 cm), 50Ω RG 58C/U
Adapter: BNC plug-double banana plug
Adapter: BNC jack-.250” phone plug
Adapter: BNC plug-.250” phone jack
Adapter: BNC jack-phono plug
Adapter: BNC plug-phono jack
Adapter: Phone jack-double banana plug
Adapter: Phono jack-double banana plug
7-1
Chapter 7
Schematic Diagrams
Figure Title Page
7-1. A1 Main PCB Component Locations (TopView) ............. 7-3
7-2. Test Point Locations........................................................... 7-4
7-3. . A/D Measurement Cycle .................................................... 7-5
7-4. . Switch Detail...................................................................... 7-5
7-5... A1 Main PCB Schematic Diagram.................................... 7-7
7-6. . A3 RMS PCB Schematic Diagram..................................... 7-8
8062A
Instruction Manual
7-2
Schematic Diagrams
7
7-3
8062A-4031
iv39c.eps
Figure 7-1. A1 Main PCB Component Locations (TopView)
8062A
Instruction Manual
7-4
Test Point
TP1
TP2
TP3
TP4
TP5
TP6
TP7
TP8
TP9
TP10
TP11
Description
VDD, +5.2V supply.
VSS, -5.1V supply.
VDG, digital supply, +3.15V ref. to VDD (TP7)
VBG, bandgap ref., 1.2345V
Supply ground.
U5/57, scope trigger, A/D cycle
VDD, +5.2V supply (on uC pcb)
VDG, digital supply, +3.15V ref. to VDD (TP7)
uC clock, 40 kHz nominal
Freq./Continuity comparator output
Ohms Source Output
TP10
Top of R16
TP9
TP8
TP7
TP8
TP11
S2A/N.O. TP2
S2D/Wiper
(hole in AC Shield)
TP5
Top of VR3
TP4
Thru-hole
TP3 - Z4-1
(Accessible
only on bottom
of A1 Main PCB)
iv41c.eps
Figure 7-2. Test Point Locations
Schematic Diagrams
7
7-5
1V 50mS
0%
Shown, is the a/d measurement cycle for three readings:
halfscale, fullscale and overrange (refer to Figure 4-3 and
Section 4 for theory of operation). The three overlaid traces
shown were made on a storage oscilloscope connected to
U3-17 and triggered by TP6.
dy42f.eps
Figure 7-3. A/D Measurement Cycle
dy43c.eps
Figure 7-4. Switch Detail
8062A
Instruction Manual
7-6
8062A
Instruction Manual
7-7
8062A-1201
iu46c.eps
Figure 7-5. A1 Main PCB Schmatic Diagram
8062A
Instruction Manual
7-8
8060A-1003
iu61f.eps
Figure 7-6. A3 RMS PCB Schmatic Diagram
