FLUKE-27-II - Fluke - Datasheet.Directory

Multimeter

Users Manual

Mode d'Emploi

Bedienungs-Handbuch

Manuale d'Uso

Manual de Uso

For IEC 61010 CAT III Meters Only

October 1998 Rev . 2, 12/03

All product names are trademarks of their respective companies.

LIMI T ED WARRANTY & LIMITAT ION OF LIABILITY

Each Fluke 20, 70, 80, 170 and 180 Series DMM will be free from defects in material and workmanship for its lifetime. As used herein, “lifetime” is defined as seven

years after Fluke discontinues manufacturing the product, but the warranty period shall be at least ten years from the date of purchase. This warranty does not cover

fuses, disposable batteries, damage from neglect, misuse, contamination, alteration, accident or abnormal conditions of operation or handling, including failures

caused by use outside of the product’s specifications, or normal wear and tear of mechanical components. This warranty covers the original purchaser only and is not

transferable.

For ten years from the date of purchase, this warranty also covers the LCD. Thereafter, for the lifetime of the DMM, Fluke will replace the LCD for a fee based on

then current component acquisition costs.

To establish original ownership and prove date of purchase, please complete and return the registration card accompanying the product, or register your product

on http://www.fluke.com. Fluke will, at its option, repair at no charge, replace or refund the purchase price of a defective product purchased through a Fluke

authorized sales outlet and at the applicable international price. Fluke reserves the right to charge for importation costs of repair/replacement parts if the product

purchased in one country is sent for repair elsewhere.

If the product is defective, contact your nearest Fluke authorized service center to obtain return authorization information, then send the product to that service

center, with a description of the difficulty, postage and insurance prepaid (FOB Destination). Fluke assumes no risk for damage in transit. Fluke will pay retu rn

transportation for product repaired or replaced in-warranty. Before making any non-warranty repair, Fluke will estimate cost and obtain authorization, then invoice

you for repair and return transportation.

THIS WARRANTY I S YOUR ONLY REMEDY. NO OTHER WARRANTIES, SUCH AS FITNESS FOR A PARTICUL AR PURPOSE, ARE EXPRESSED OR

IMPLIED. FLUKE SHALL NOT BE LIABLE FOR ANY SPECIAL, INDI RECT, INCIDENTAL OR CONSEQUENTIAL DAMAGES OR L OSSES, INCLUDING LOSS

OF DATA, ARISING FROM ANY CAUSE OR THEORY. AUTHORIZED RESELLERS ARE NOT AUTHORIZED TO EXTEND ANY DIFFERENT WARRANTY ON

FLUKE’S BEHALF. Since some states do not allow the exclusion or limitation of an implied warranty or of incidental or consequential damages, this limitation of

liability may not apply to you. If any provision of this warranty is held invalid or unenforceable by a court or other decision-maker of competent jurisdiction, such

holding will not affect the validity or enforceability of any other provision.

Fluke Corporation Fluke Europe B .V.

P.O. B ox 9090 P.O. B ox 1186

Everett WA 5602 B.D. Eindhoven

98206-9090 The Netherlands

Visit the Fluk e website at: www.fluke.com

i
Table of Contents
Title Page
Multimeter Safety........................................................................................................... 1
Operating Features........................................................................................................ 5
Applications................................................................................................................... 9
Voltage, AC/DC......................................................................................................... 9
Current, AC/DC......................................................................................................... 9
Resistance and Diode Test/Continuity...................................................................... 10
Resistance Measurement..................................................................................... 10
Diode Test and Continuity.................................................................................... 10
Conductance............................................................................................................. 11
Leakage Testing ....................................................................................................... 11
Analog Bar Graph Application ....................................................................................... 12
Using the Analog Bar Graph..................................................................................... 12
Specific Applications--Nulling.................................................................................... 13
Specific Applications--Contact Bounce..................................................................... 13
Specific Applications--Checking Capacitors.............................................................. 13

Users Manual

Specific Applications--Noisy Resistance Measurements........................................... 16

Operator Maintenance................................................................................................... 16

Battery Installation or Replacement .......................................................................... 17

Fuse Test.................................................................................................................. 19

Fuse Replacement.................................................................................................... 19

General Maintenance................................................................................................ 20

Service........................................................................................................................... 22

Specifications................................................................................................................. 23

Multimeter Safety

Read this information before using the meter. This meter

complies with EN 61010-1:1993, ANSI/ISA S82.01-1994

and CAN/CSR C22.2 No. 1010.1-92 Overvoltage

Category III. Use the meter only as specified in this Users

Manual, otherwise the protection provided by the meter

may be impaired.

• A Warning identifies conditions and actions that

pose hazard(s) to the user.

• A Caution identifies conditions and actions that

may damage the meter or the equipment under

test.

W Warnings

To avoid possible electric shock or personal

injury:

• Inspect the meter before using it. Check

for cracks, missing plastic, or other

possible damage to the case. Make sure

that the insulation surrounding the

connectors is intact.

• Inspect the test leads for damaged

insulation, exposed metal, and continuity.

Replace damaged test leads before using

the meter.

• Do not use the meter if it operates

abnormally. Protection may be impaired.

When in doubt, have the meter serviced.

• Do not operate the meter around

explosive gas, vapor or dust.

• Do not apply more than the rated voltage

(1000 V) between terminals or between

any terminal and earth ground. The rated

voltage is marked on the meter.

• Before each use, verify the meter’s

operation by measuring a known voltage.

• Use only specified replacement parts.

• Use caution when working above 30 V ac

rms, 42 V ac peak, or 60 V dc. Such

voltages pose a shock hazard.

• When using the probes, always place

fingers behind the probe finger guards.

• Connect the common test lead before

connecting the live test lead. When

disconnecting test leads, disconnect the

live test lead first.

• Make sure the battery door is secured

before operating the meter.

Users Manual

• Remove test leads from the meter before

opening the battery door.

• Use only a properly installed, single 9 V

battery to power the meter.

• Follow all equipment safety procedures.

• Check the meter’s fuses (see “Testing the

Fuses”) before measuring current.

• Never touch the probe to a voltage

source when the test leads are plugged

into the 10 A or 40 mA input jacks.

• The use of makeshift fuses and the short-

circuiting of fuse holders is prohibited.

• To avoid false readings, which could lead

to possible electric shock or personal

injury, replace the battery as soon as the

battery indicator (M) appears.

• The meter is waterproof to a depth of 1

meter. Remove all surface water from the

product including water around, within

and under the rotary knob, input

receptacles and buttons prior to

connecting any voltages to the input.

International symbols used on the meter and in this

manual are explained in Table 1.

Multimeter Safety

Table 1. International Electrical Symbols

OOFF (power)

SWITCH POSITION GROUND

ON (POWER)

SWITCH POSITION SEE EXPLANATION IN

MANUAL

AC-ALTERNATING

CURRENT DOUBLE INSULATION

(Protection Class II )

DC-DIRECT CURRENT FUSE

EITHER DC OR AC BATTERY

Users Manual

Table 2. Input Terminals and Limits

Function Input Terminals

Red Lead Black Lead

Min Display

Reading Max Display

Reading Maximum Input

CI VOD COM 0.001 V 1000 V 1000 V

JF VOD COM 0.1 mV 320.0 mV 1000 V

(nS) VOD

VOD

COM

COM 0.1 e

0.01 nS 32.00 Me

32.00 nS 1000 V

1000 V

SVOD E 0.001 V 2.08 V 1000 V

A COM 0.01 A 20.00 A* 11 A 1000 V Fast Fuse**

AE U COM 0.01 mA 320.0 mA 44/100 A 1000 V Fast Fuse**

MN U COM 0.1 µA 3200 µA 44/100 A 1000 V Fast Fuse**

*10A continuous, 20A overload for 30 seconds maximum

**Fuse protected

Operating Features

The following features are keyed by number to the

illustration inside the front cover.

A Digital Display

3200 count, liquid crystal display with automatic decimal

point positioning. Updated two times per second. When

the meter is first turned on, all display segments appear

while the instrument performs a brief power-up self-test.

B Function Selector Rot ar y Swit ch

Turn to select any of 10 different functions, or OFF. Refer

to the Specifications for available ranges and to Table 2

for input terminals and limits.

CVolts dc

JMillivolts dc

IVolts ac

FMillivolts ac

OOhms (resistance), also conductance (1/e)

in nanosiemens (nS)

SContinuity or diode test

AMilliamps or amperes dc

MMicroamps dc

EMilliamps or amperes ac

NMicroamps ac

C TVolt, Ohm s , Diode Test Input

Terminal

Input terminal used in conjunction with the volts, mV (ac

or dc), ohms, or diode test position of the function

selector rotary switch.

D COM Com m on Ter minal

Common or return terminal used for all measurements.

E U Milliamp/M icroamp Input Ter minal

Input terminal used for current measurements up to 320

mA (ac or dc) with the function selector rotary switch in

the mA or µA positions.

F A Amperes Input Terminal

Input terminal used for current measurements up to 10A

continuous (20 A overload for 30 seconds) with the

Users Manual

function selector rotary switch in the mA/A position (ac or

dc).

G RANGE R Manual Range Mode

Pushbutton

Press once to enter manual range mode, press again to

increment range, press and hold for 2 seconds to return

to autorange. Meter returns to autorange if the function

selector is switched to any other position. There is no

autorange annunciator; absence of the manual range

annunciator indicates the meter is in autorange. If

RANGE is depressed (>1 second) while the function

switch is moved from OFF to any ON position, manual

ranging will be selected in all functions.

H REL L Relative Mode Pushbutt on

Press momentarily to enter the Relative mode and store

the displayed reading. The display will read zero. Press

again to update the stored digital reading. Press and hold

for 2 seconds to exit the Relative mode. The Relative

mode stores a digital reading and displays the change

(difference) between the stored reading and any following

reading. For example, if the stored reading is 15.00 V and

the present readings is 14.10 V, the display will indicate -

0.90V. The analog bar graph continues to display the

actual reading (14.10V). If the difference exceeds 3999

counts (without overloading the input), OF (overflow) is

displayed. The Relative mode selects manual ranging;

changing ranges automatically exits the Relative mode.

I MIN/MAX Mode Pushbutton

Press momentarily to enter MIN/MAX mode, press again

to toggle between MIN and MAX indications. Press and

hold for 2 seconds to exit MIN/MAX mode. The meter

stores the minimum and maximum digital readings, and

will display either reading as selected by the operator.

Press the HOLD/RESET button to reset the MIN/MAX

readings to the present input. The MIN/MAX mode

selects manual ranging; use a range that can record the

maximum anticipated input. Range changes reset

previously recorded MIN/MAX readings. Exiting the

MIN/MAX mode does not reset the previously recorded

readings unless the range or function is changed. The

MIN/MAX mode overrides the Touch Hold mode.

W Warning

To avoid electric shock or personal injury, do

not use Touch Hold to determine that

circuits with dangerous voltages are de-

energized. Touch Hold will not capture

unstable or noisy readings.

Operating Features

J HOLD H Touch Hold



Mode Pushbutton

Press momentarily to enter Touch Hold mode. In Touch

Hold, the meter captures a stable measurement and

holds it in the display. The operator can watch the probes

while taking measurements in difficult or hazardous

circuits, then look at the display when convenient. The

meter beeps and the display is automatically updated

each time a new, stable measurement is made. Press

momentarily to manually update reading. Press and hold

for 2 seconds to exit Touch Hold mode. If HOLD is

depressed (>1 second) while the function switch is moved

from OFF to any ON position, the Touch Hold mode will

only update to a new reading when the HOLD button is

pressed and automatic Touch Hold updates are

defeated. This is useful when you want to take a reading

at a specific time and hold it.

K MIN Minimum Annunciator

Indicates that the meter is in the MIN/MAX recording

mode, and the value displayed is the minimum digital

reading taken since reset or since entering MIN/MAX.

Refer to item 9 for operation.

L MAX Maximum Annunciator

Indicates that the meter is in the MIN/MAX recording

mode, and the value displayed is the maximum digital

reading taken since reset or since entering MIN/MAX.

Refer to item 9 for operation.

M L Relative Annunciator

Indicates that the meter is in the Relative mode and that

the value displayed is relative (the difference between the

present measurement and the previously stored reading).

Refer to item 8 for operation.

N H Touch Hold



Mode Annunciator

Displayed when the Touch Hold mode is in use. Refer to

item 10 for operation.

O Mke Resistance Annunciators

The Ω and either the k or M is displayed for the

resistance range in use.

P nS Conductance Range Annunciator ( nS)

Top range of the resistance function is the conductance

range. Displays conductance in nS (nanosiemens). 1000

Users Manual

nS converts to megohms. (Example: 2 nS converts to 500

Me.) Use for measuring resistance above 32 megohms.

Select e, open test leads, press RANGE button twice.

Refer to item 7 for manual range operation.

Q Analog Bar Graph Display

Analog representation of input. Composed of 31

segments which illuminate starting from the left as the

input increases. (See display inside rear cover.) A minus

sign (-) is displayed for reverse-polarity inputs. Updated

25 times per second.

R Decimal Point/Range I ndicator

Decimal point position and the digits (3, 30, 300) under

the decimal point indicate the range in use.

S R Manual Range Annunciator

Displayed in the Manual Range mode or if the selected

function has only one range. Absence of the indicator

implies autorange mode in use. The meter powers-up in

autorange. In autorange, the meter automatically selects

the measurement range. Refer to item 7 for operation.

T M Low Battery Annunciator

Battery voltage is tested each time the function switch is

moved to a new position.

WWarning

To avoid false readings, which could lead to

possible electric shock or personal injury,

replace the battery as soon as the low

battery indicator (M) appears.

U − Negative Polarity Annunciat o r

Automatically indicates negative input.

V Overload Indication

These symbols indicate the input is too large for the input

circuitry. (The location of the decimal point depends on

the measurement range.)

W Overflow Indication

These symbols indicate the calculated difference in the

Relative mode is too large to display (>3999 counts) and

that the input is not overloaded.

Applications

X Beeper (not illust r a t ed)

The beeper can produce beeps, clicks, or a cont inuous

tone. It is used for audible indication in the diode test

mode, when operating the push buttons, and when a new

reading is displayed in the Touch Hold mode.

Tilt Bail Adjustment

To use the tilt bail as a handle, lift the bail slightly (about

1 inch or 2.5 cm), pull the ends out and insert the ends in

the alternate set of holes.

Applications

Voltage, AC/DC

All ranges present an input impedance of approximately

10 megohms in parallel with less than 100 pF.

Measurement errors, due to circuit loading, can result

when making either ac or dc voltage measurements on

circuits with high source resistance. However, in most

cases the error is negligible (0.1% or less) if the

measurement circuit source resistance is 10 kilohms or

less.

When measuring voltages above 320 V in Touch Hold

mode, use manual ranging to minimize readings of stray

voltages.

Current, AC/DC

WWarning

To avoid electric shock or personal injury:

• Never attempt an in-circuit current

measurement where the open-circuited

potential to earth is greater than 1000 V.

• Before measuring current, check the

meter’s fuses (see “Testing the Fuses”).

• Turn off circuit power before connecting

the meter in the circuit. Remember to

place the meter in series with the

current. Use proper terminals, function,

and range for your measurement.

To prevent arc blast and resulting injury,

install only the EXACT replacement fuse

listed in the Maintenance section.

All current ranges are fuse protected. Approximate

terminal resistances for the current ranges are: 0.1 ohms

for A, 5.6 ohms for mA, and 500 ohms for µA. The

voltage developed across the terminal resistance is

specified as burden voltage. If a fuse opens, refer to the

fuse replacement procedures in the Operator

Maintenance section of this manual.

Users Manual

Resistance and Diode Test/Continuity

Caution

To avoid possible damage to the meter or to

the equipment under test, disconnect circuit

power and discharge all high voltage

capacitors before measuring resistance,

testing for continuity, or diode test.

Resistance Measurement

Test lead resistance may influence measurement

accuracy on the 320-ohm range. To determine the error,

short the test leads together and read the lead

resistance. Correct the measurement by subtracting the

lead resistance from the measurement, or use the

Relative (REL) mode to zero the display. The error is

usually 0.1 to 0.2 ohms for a standard pair of test leads.

Some in-circuit resistance measurements can be made

without removing diodes and transistors from the circuit.

The full-scale measurement voltage produced on ranges

below 32 megohms does not strongly forward bias silicon

diodes or transistor junctions. Use the highest range you

can (except 32 megohm) to minimize the possibility of

turning on diodes or transistor junctions. Full scale

measurement voltage in the 32-megohm range does

strongly forward bias a diode or transistor.

Diode Test and Continuity

In diode test, there is only one range: 0 to +2.08 volts.

Voltage is developed across the component(s) under test

by a test current output from the Fluke 27. Voltages

greater than 2.08 V or open test leads produce an

overload (OL) condition. Negative inputs produce a

negative indication (they are not suppressed). In the

diode test function S the beeper produces a

continuous tone if the input is less than 0.1 V, and the

beeper beeps once when the input descends through a

0.7 V threshold.

Audible continuity testing is also performed with the

function selector switch in the diode test/continuity

position. A continuous tone sounds for test resistances

below approximately 270 ohms. An intermittent

connection produces erratic beeps, and can be valuable

troubleshooting aid. Erratic beeps can also occur, due to

environmental noise, if a test value is very close to the

threshold (270 ohms). Test resistances from

approximately 270 ohms to 2600 ohms produce a short

tone similar to a forward biased diode. Test resistances

less than approximately 36 kilohms will produce an on-

scale reading.

Applications

Conductance

Conductance measurement is performed with the

function selector switch in the ohms (e) function. The

conductance range can only be entered using manual

range selection; autorange cannot enter the conductance

range. The conductance range can be used both to

measure conductance (1/e, the inverse of resistance)

and to measure very high resistances (greater than 32

megohms).

High value resistance measurements are susceptible to

induced noise, and may require careful shielding.

Conductance measurements are displayed in

nanosiemens (nS). Calculate megohms by dividing 1000

by the nanosiemens displayed (1000/nS is equivalent to

megohms). Example: 2 nS converts to 500 megohms

(1000/2).

Leakage Testing

The conductance range effectively extends the resistance

measurement capability of the Fluke 27 to the point

where it can provide useful leakage measurements on

passive components. For example, the operator can

detect leaky diodes, cables, connectors, printed circuit

boards, etc. In all cases, the test voltage is less than 2 V

dc.

Leakage testing on purely resistive components such as

cables and printed circuit boards is straightforward.

Select the ohms function and manually increment the

range to conductance (nS). Connect the test leads to the

test points (nS). Connect the test leads to the test points

on the unit under test, and read the leakage in terms of

conductance.

Note

There is normally a small residual reading with

open test leads in the conductance range. To

ensure accurate measurements, connect clean

test leads to the Fluke 27, and (with the leads

open) read the residual leakage in

nanosiemens. Correct subsequent

measurements by subtracting the residual from

the readings. This can be done automatically

using the Relative mode (REL).

Diode leakage tests require that the diode junction be

reverse biased when being measured. This is

accomplished by connecting the anode of the diode to

the COMMON input terminal and the cathode (ring) of the

diode to the volts/ohms/diode test terminal. Leakage at

the test voltage being applied can then be read in terms

of conductance.

Users Manual

High-voltage stacked diode assemblies can usually be

tested for forward and reverse resistance changes using

conductance. These assemblies typically have such high

forward voltage drops that the diode test or resistance

modes cannot test them.

Analog Bar Graph Application

In looking at the analog bar graph, notice that it is

composed of segments that simulate an analog needle.

The bar graph performs the same function as an analog

meter needle, but it eliminates the mechanical overshoot

inherent in needle movements.

A negative (-) annunciator is displayed at the left end of

the bar graph when taking a reverse polarity dc

measurement. Assume that a slowly varying dc voltage is

the input signal. As the input goes more positive (from

zero), a bar graph segment is displayed, and additional

segments are displayed from left to right, to indicate the

input level as it increases. Now, assume that the input

level slowly decreases. Fewer bar graph segments are

displayed as the signal decreases, then the - annunicator

flashes as the signal level passes through 0. As the

signal goes more negative, the - annunciator is displayed

from left to right, indicating a more negative input signal.

The first segment is an indication greater than or equal to

20 counts.

Note that every fifth segment of the bar graph is slightly

larger than those in between, and every tenth segment is

larger yet. These larger segments provide a quick

reference for bar graph indications. The largest segments

(every 10th segment) divide the display into thirds. Thus,

if the bar graph indicates 11 segments on the 32.00V

range, the input voltage is 10 to 11 volts; if the bar graph

indicates 11 segments on the 320.0V range, the input

voltage is 100 to 110 volts. If the input equals or exceeds

3000 counts on the range selected, the bar graph

displays, an arrow at the far right of the display. If the

manual range annunciator (R) is not displayed, the Fluke

27 automatically switches to the next high range if the

input exceeds approximately 3260 counts

Using the Analog Bar Graph

The analog bar graph is most useful in making

adjustments and performing limited diagnostics. Bar

graph response is fast and precise, so it can be used to

easily reach a setting within a few percent of the final

adjustment. The bar graph can be used to make rough

adjustments quickly; then the 3200-count digital display

can be used for final adjustment.

The analog bar graph is useful for performing limited

diagnostics in applications were rapidly fluctuating signal

levels cause the flashing digits of a digital display to be

useless. Like the traditional VOM needle, the analog bar

Analog Bar Graph Application

graph excels at displaying trends, or slowly changing

signals. In addition, autoranging on the Fluke 27 allows

monitoring the signal change through changing ranges.

Many diagnostic routines using the bar graph require

practice. The operator is looking for good or bad signal

patterns that occur over some span of time. Capacitance

checks and noisy resistance measurements create such

patterns. Therefore, familiarity with analog bar graph

response and movement is necessary to accurately

interpret a signal pattern. Compare the bar graph

response when making measurements on a known-good

unit to the bar graph response when making

measurements on a faulty unit.

Specific Applications--Nulling

The Fluke 27 bar graph is ideal for nulling adjustments.

As an adjustment approaches zero, fewer bar graph

segments are displayed, then no bar graph segments are

displayed. The - annunciator flickers when the input level

is within 10 counts to zero. The flickering null indication is

displayed every time the input approaches zero or swings

from one polarity to the other. The operator merely

watches for the - annunicator indication, then reverses

the direction of the adjustment when the polarity sign is

displayed. In one or two passes, a near-zero input level is

possible, then the digital display can be used for exact

zero adjustment.

Specific Applic ations--Contact Bounce

When subject to vibration, relay contacts may begin to

bounce open. Checking for this intermittent problem is a

routine troubleshooting measure associated with many

types of equipment, including computers. Since the

bounce problem will worsen as the relay fatigues, early

diagnosis is important.

When the contact bounces open, its resistance value

changes momentarily from zero to infinity and back.

Ordinary hand-held DMMs take more than 300

milliseconds to update their displays--much too long to

detect a brief contact bounce. A traditional VOM needle

will move slightly at the instant of contact bounce, but the

inertia of the needle movement dampens the response.

The analog bar graph, however, will display at least one

segment the moment the contact opens. The bar graph

can detect contact bounce as brief as 0.2 milliseconds,

while most analog needle movements require a 3

millisecond opening before they will respond.

Specific Applications--Checking Capacitors

Volt-ohm meters are often used as simple capacitor

checkers. In the capacitor kick test, the needle of the

VOM in the resistance mode moves quickly from open

(infinite ohms) toward short (zero ohms) as the capacitor

is placed across the VOM input. The VOM battery

Users Manual

charges the capacitor and the needle slowly moves back

to the open (infinite ohms) position. The higher resistance

ranges offer increased sensitivity for checking smaller

capacitors.

The analog bar graph can make similar checks in the

resistance function, even in the autoranging mode. As a

capacitor is placed across the inputs, the analog bar

graph quickly shortens, then rapidly down-ranges,

depending on the size of the capacitor. As the capacitor

charges, the bar graph slowly extends back to its full 31-

segment length, up-ranging if necessary. For capacitors

as small as 0.1µF, only the 32-megohm range is involved.

In a fixed range (using manual range mode), the time it

takes for the bar graph to extend from zero to full scale

indicates the approximate capacitance value. Table 3

gives typical capacitance values for various charge times

on different resistance ranges. For very small capacitors,

use the conductance (nS) mode.

Analog Bar Graph Application

Table 3. Capacitance Vs. Time to Full Scale

Capacitance Resistance Range

Value 320 e3.2 ke32 ke320 ke3.2 Me32 Me

10,000 µF 4 sec 33 sec 5 min ext ext ext

1,000 µF nil 4 sec 30 sec ext ext ext

100 µF nil nil 3 sec 28 sec ext ext

10 µF nil nil nil 3 sec 25 sec ext

1 µF nil nil nil nil 2 sec 15 sec

0.1 µF nil nil nil nil nil 2 sec

ext = extended time, nil = no indication

Users Manual

Specific Applications--Noisy Resistance

Measurements

Most digital multimeters are so sensitive they can not

tolerate as much as 50 mV of the line noise while making

resistance measurement; their digital displays become

unreadable due to the line noise. On the other hand,

because of the mechanical inertia of the analog needle,

the noise alternately pulls the needle to the left and then

to the right, averaging out any movement and leaving a

fairly stable resistance reading.

The Fluke 27 resistance measurement circuit is designed

to tolerate ac noise far better than the usual DMM.

Readable 2-kilohm readings can be obtained even in the

presence of 1 V ac noise. Readings of 1 megohm may be

obtained with up to 2 V ac noise. The noise appears as

about 50 counts of change and an oscillating bar graph.

Operator Maintenance

WWarnings

To avoid possible electric shock or personal

injury:

• Do not allow water to get inside the case.

• Remove any input signals prior to

removing test leads and opening case.

• When servicing the meter, use only

specified replacement parts.

• Before closing battery door, make sure

fuse cover is in place.

• Make sure the battery door is closed and

latched before you operate the meter.

To prevent arc blast and resulting injury,

install only the EXACT replacement fuse

listed in the Maintenance section.

Operator Maintenance

Battery Installation or Replacement

A single 9V battery (NEDA 1604, 6F22, or 006P) supplies

power to operate the Fluke 27. Referring to Figure 1, use

the following procedure to replace the Fluke 27 battery:

1. Turn the rotary switch to OFF, and remove the test

leads.

2. Lift the instrument stand on the back of the Fluke 27,

then remove the four black, #6 X 32, Pozi-drive

screws from the battery cover.

3. Pull the battery cover straight out from the back of

the meter. (A coin-slot in the side of the battery cover

facilitates removal.)

4. Remove and disconnect the battery.

5. Snap the battery connector to the terminals on the

new battery, then slide the battery into the battery

compartment.

6. Insert the battery spacer/cover into the Fluke 27,

then start the four screws removed in step 2. Press

firmly on the battery cover while tightening the

screws in a diagonal pattern.

Users Manual

Fuse cover

Battery cover

Battery

connector

ye1f.eps

Figure 1. Battery and Fuse Replacement

Operator Maintenance

Fuse Test

WWarnings

To avoid possible electric shock or personal

injury:

• Remove the test leads and any input

signals before replacing battery or fuses.

• Before closing battery door, make sure

fuse cover is in place.

• Make sure the battery door is closed and

latched before you operate the meter.

To prevent arc blast and resulting injury,

install only the EXACT replacement fuse

listed in Table 4.

1. Turn the function selector switch to the Ω position.

2. Connect a test lead from the T input terminal

to the A input terminal.

3. The display should indicate between 0.1 ohm and

0.3 ohm. This tests F2 (11A, 1000V fast).

4. Move one end of the test lead from the A input

terminal to the mA/µA input terminal.

5. The display should indicate between 5.3 ohms and

6.0 ohms. This tests F1 (44/100A, 1000V fast.

6. If either of the above display indications is OL

(overload), replace the appropriate fuse.

Fuse Replacement

WWarning

To avoid personal injury, do not use

makeshift fuses or short-circuit the fuse

holders.

Referring to Figure 1, use the following procedure to

check or replace the Fluke 27 fuses:

1. Perform steps 1 through 4 of the battery replacement

procedure.

2. Pull the fuse cover down, then out of the meter.

3. Remove the defective fuse (or check continuity

through the suspected fuse), and if necessary install

a new fuse of the same size and rating.

4. Snap the fuse cover back into place.

5. Reinstall the battery spacer/cover as instructed in

step 6 of the battery replacement procedure.

Users Manual

Table 4. Replacement Fuses

Item Description PN Qty

Fuse, F44/100A,

1000 VAC/DC 943121 1

Fuse, F11A, 1000

VAC/DC 803293 1

W To ensure safety, use exact replacement only

General Maintenance

Clean the case with a damp cloth and detergent; do not

use abrasives or solvents.

The Fluke 27 is sealed to protect the instrument. To

maintain proper sealing, open only the battery/fuse

compartment.

Have the meter calibrated and the seals (part number

738112) replaced by a qualified technician once a year to

ensure specified performance. Contact the nearest Fluke

Service Center or refer to the Fluke 27 Service Manual

(part number 690206) for calibration or repair. Refer to

Table 5 for replaceable parts.

Table 5. Replaceable Parts

Item Description PN Qty

BT1 Battery, 9V 696534 1

H6 Screw, PH 6-32 x 3/8 682070 4

MP11 Foot, Case 654335 1

MP12 Bail, Tilt (Bracket) 744474 1

MP14 Cover, Battery 670585 1

MP15 O-Ring, Battery 697185 1

MP16 Spacer, Battery 665023 1

MP61 Fuse Cover 665031

TL75* Test Lead Set 1

AC72* Allicator Clip Set 1

TM1 Users Manual 690203 1

TM2 Service Manual 690206 1

*Accessor y Number

Operator Maintenance

MP12

MP61

MP15

MP16

MP14

BT1

MP11 TL75

Test Lead Set

AC72

Alligator Clips

ye2c.eps

Figure 2. Replaceable Parts

Users Manual

Service

To contact Fluke, call one of the following telephone

numbers:

USA: 1-888-99-FLUKE (1-888-993-5853)

Canada: 1-800-36-FLUKE (1-800-363-5853)

Europe: +31 402-675-200

Japan: +81-3-3434-0181

Singapore: +65-738-5655

Anywhere in the world: +1-425-356-5500

Or, visit Fluke’s Web site at www.fluke.com.

Specifications

Function Range Resolution Accuracy*

3.200 V 0.001 V ±(0.1%+1)

C32.00 V 0.01 V ±(0.1%+1)

320.0 V 0.1 V ±(0.1%+1)

1000 V 1 V ±(0.1%+1)

J320.0 mV 0.1 mV ±(0.1%+1)

320.0 e0.1 e±(0.3%+3)**

3.200 ke0.001 ke±(0.2% +1)

O32.00 ke0.01 ke±(0.2% +1)

(nS) 320.0 ke0.1 ke±(0.2% +1)

3.200 Me0.001 Me±(0.2% +1)

32.00 Me0.01 Me±(1%+1)

32.00 nS 0.01 nS ±(2%+10)

S2.080 V 0.001 V ±(1%+1) typical

40 Hz-2 kHz 2 kHz-10 kHz 10 kHz-30 kHz

3.200 V 0.001 V ±(0.5%+3) ±(2%+3) ±(4%+10)

I32.00 V 0.01 V ±(0.5%+3) ±(2%+3) ±(4%+10)

320.0 V 0.1 V ±(0.5%+3) ±(2%+3) ±(4%+10)

1000 V 1 V ±(1%+3) ±(3%+3) Not Specified

F320.0 mV 0.1 mV ±(0.5%+3) ±(2%+3) ±(4%+10)

** When using the REL (∆) function to compensate for offsets

Users Manual

Function Range Resolution Accuracy Typical Burden Voltage

32.00 mA 0.01 mA ±(0.75%+2) 5.6 mV/mA

A320.0 mA 0.1 mA ±(0.75%+2) 5.6 mV/mA

10.00 A 0.01 A ±(0.75%+2) 50 mV/A

M320.0 µA 0.1 µA ±(0.75%+2) 0.5 mV/µA

3200 µA 1 µA ±(0.75%+2) 0.5 mV/µA

E32.00 mA 0.01 mA ±(1.5%+2) 5.6 mV/mA

40-1000 Hz 320.0 mA 0.1 mA ±(1.5%+2) 5.6 mV/mA

10.00 A 0.01 A ±(1.5%+2) 50 mV/A

N320.0 µA 0.1 µA ±(1.5%+2) 0.5 mV/µA

40-1000 Hz 3200 µA 1 µA ±(1.5%+2) 0.5 mV/µA

* Accuracy is specified as ±([% of reading] + [number of least significant digits]).

Basic electrical accuracy is specified from 18°C to 28°C with relative humidity up to 95%, for a period of one year after

calibration. All ac conversions are ac coupled, average responding, and calibrated to read the true rms value of a sine wave

input.

Ranging is either automatic or manual in all functions with more than one range. Test resistance below approximately 270 e

in the Diode test function produces a continuous audible tone.

Specifications

Function Overload

Protection* Input Impedance

(Nominal) Common Mode Rejection Ratio

(1 ke unbalance) Normal Mode Rejection

C1000 V rms 10 Me in // with<100 pF >120 dB at dc, 50 Hz, or 60 Hz >60 dB at 50 Hz or 60 Hz

J1000 V rms 10 Me in // with<100 pF >120 dB at dc, 50 Hz, or 60 Hz >60 dB at 50 Hz or 60 Hz

I1000 V rms 10 Me in // with<100 pF

(ac coupled) >60 dB, dc to 60 Hz

F1000 V rms 10 Me in // with<100 pF

(ac coupled) >60 dB, dc to 60 Hz

Open Circuit Test Voltage Full Scale Voltage

O1000 V rms Up to 3.2 Me32 Me or nS

<2.8 V dc <420 mV dc <1.3 V dc

*107 V Hz Max

Maximum Voltage Between Any

Terminal and Earth Ground Function Fuse Protection

1000 V mA or µA

A44/100 A 1000 V Fast

11 A 1000 V FasT

Users Manual

Digital

Display

......................................................................

3200 counts, updates 2/sec

Analog

Display

.....................................................................

31 Segments, updates 25/sec

Operating

Temperature

.......................................................

-15°C to 55°C, to -40°C for 20 minutes when taken from

20°C

Storage Temperature

Without

Battery .................................................................

With

Battery ......................................................................

-55°C to 85°C

-55°C to 60°C

Electromagnetic

Compatibility

...........................................

In an RF field of 3 V/m on all ranges and functions except

mVAC

, total accuracy = specified accuracy +1.0% of range.

For mVAC, total accuracy = specified accuracy + 1.5% of

range. EN 61326-1:1997

Temperature Coefficient...................................................... 0.1X (specified accuracy)/ °C (<18°C or >28°C)

Relative

Humidity

.................................................................

0% to 95% (0°C to 35°C)

0% to 70% (35°C to 55°C)

Battery

Type

.........................................................................

9 V, NEDA 1604 or 6F22 or 006P

Battery

Life

...........................................................................

1000 hrs. typical

Shock, Vibration and Water

Resistance

............................

Per MIL-T-28800 for a Style A, Class 2 Instrument

Size (H X W X

L )

..................................................................

2.2 in X 3.75 in X 8 in (5.6 cm X 9.5 cm X 20.3 cm)

Weight

...................................................................................

1.6 pounds (0.75 kg)

Altitude

.................................................................................

Safety

....................................................................................

2000 m maximum

Complies with ANSI/ISA S82.01-1994, CAN/CSA C22.2 No.

1010.1:1992, 1000 V Overvoltage Category III. UL3111-1.