DPM1AS-BL - Lascar Electronics, Inc.

PRODUCT DESCRIPTION

The DPM 1AS-BL features a 200mV d.c. measurement range with auto-zero and auto-polarity. Decimal points are user

selectable.

LED backlighting ensures excellent readability under low light conditions.

easily snapped into a panel. The module's

The DPM 1AS-BL features a negative rail generator which enables the meter to measure a signal referenced

to its own power supply GND. The design

of the panel meter's housing allows the module to be low cost means it will

suit high and low volume applications. The DPM 1AS-BL is intended to replace the DPM 1, DPM 1S, DPM 1-BL and

DPM 1S-BL in many applications, usually requiring only minor circuit modifications.

FEATURES

• 5.5

• 200mV d.c. Full Scale Reading

• 3.0 to 7.5V or 6.0 to 15.0V Operation

•

mm (0.22") Digit Height

Programmable Decimal Points

LED Backlighting

Auto-zero and Auto-polarity

TYPICAL APPLICATIONS

• Precision Instrumentation Systems

• Power Supply Monitoring

• Hand held instruments

• Panel-Mount Indication

• Low Power Voltage Measurement

ORDERING INFORMATION

Stock Number

Standard Meter DPM 1AS-BL

LASCAR ELECTRONICS LTD.

MODULE HOUSE

WHITEPARISH

WILTSHIRE SP5 2SJ

TEL: +44 (1794) 884567

FAX: +44 (1794) 884616

E-mail: sales@lascar.co.uk

LASCAR ELECTRONICS INC.

PO BOX 50727

PALO ALTO

CA 94303-0727

USA

TEL: +1 (650) 838 9027

FAX: +1 (650) 833 5432

E-mail: lascarus@pacbell.net

LASCAR ELECTRONICS (HK) LIMITED

FLAT C, 5/FL., LUCKY FTY. BLDG.

63-65 HUNG TO ROAD

KWUN TONG KOWLOON

HONG KONG

TEL: +852 2797 3219

FAX: +852 2343 6187

E-mail: b4lascar@samsongroup.com.hk

DPM 1AS-BL

3½ Digit Backlit LCD Voltmeter Module

SAFETY

To comply with the Low Voltage Directive (LVD 93/68/EEC), input voltages to the module’s pins must not exceed

60Vdc. The user must ensure that the incorporation of the panel meter into the user’s equipment conforms to the

relevant sections of BS EN 61010 (Safety Requirements for Electrical Equipment for Measuring, Control and

Laboratory Use).

ELECTRICAL SPECIFICATIONS

Specification Min. Typ. Max. Unit

Accuracy (overall error) * 0.1 % (±1 count)

Linearity ±1 count

Sample rate 2.5 samples/sec

Operating temperature range 0 50 °C

Temperature stability 250 ppm/°C

Meter supply voltage V+ to GND configuration 3.0 5.0 7.5 V d.c.

175 A

Backlight supply voltage 4.75 5.0 *** V d.c.

Backlight supply current @ 5V d.c. 15 30**** mA

Input leakage current (Vin = 0V) 1 10 pA

* To ensure maximum accuracy, re-calibrate periodically.

** Operation of the meter beyond the maximum supply voltage rating may cause permanent damage to the meter.

*** An external series resistor is required above 5V, see Applications.

**** This specification linearly derates to 20mA @ 50°C.

V+ to V- configuration 6.0 9.0 15.0** V d.c.

Meter supply current V+ to GND configuration 350 A

V+ to V- configuration

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Unless otherwise noted, specifications apply at T =25°C, V =5Vd.c. (f =48kHz) and are tested with the module configured for single ended

input mode.

A supply clock

30.0 (1.18)

28.0 (1.10)

11.0 (0.43)

14.0 (0.55)

0.50 (0.02)

pin width 2.00 (0.08)

pin pitch

a. 2.00 (0.08)

b. 6.00 (0.24)

c. 1.60 (0.06)

d. 6.00 (0.24)

5.00 (0.20)

1.26 (0.05)

ab d

Panel thickness: 1.0 - 2.5

(0.04 - 0.10)

Panel cut-out: 28.4 x 11.4

(1.12 x 0.45)

DIMENSIONS

All dimensions in mm (inches)

DPM 1AS-BL

3½ Digit Backlit LCD Voltmeter Module

PANEL FITTING

PIN CONFIGURATION (rear view)

FUNCTIONAL BLOCK DIAGRAM

Vref

Module

Panel

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A/D

INHI

INLO

DP3 2 1 XDPGND

V+

V-

BL-

CAL CAL

V+

BL-

DP1

DP2

GND

DP3

INLO

INHI

V-

XDP

LCOM

LXDP

110

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DPM 1AS-BL

3½ Digit Backlit LCD Voltmeter Module

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CIRCUIT DIAGRAM

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PIN FUNCTIONS

1. V+ Positive power supply to the meter.

2. GND 0V power supply to the meter (3.0 to 7.5V meter power supply applications only).

3. V- Negative power supply to the meter (6.0 to 15.0V meter power supply applications only).

4. BL- Connect to the meter's negative supply voltage to switch on the LED backlighting.

For meter supply voltages above 5V, add a series resistor Rs.

See Applications for suitable circuit diagrams.

5. INHI Positive measuring input.

6. INLO Negative measuring input.

7. DP1 Connect to XDP to display DP1 (199.9).

8. DP2 Connect to XDP to display DP2 (19.99).

9. DP3 Connect to XDP to display DP3 (1.999).

10. XDP Connect to pin 7, 8 or 9 to display required decimal point.

A negative supply is generated internally and mirrors the positive supply. For example: if V+ is +5V, then

the internally generated V- is -5V. When measuring with the input referenced to the same supply rail as

that of the panel meter, then the limitations on the input range are (V- + 1.5V) to (V+ - 1.5V).

LCOM Normally Open. Connects INLO to COM.

LXDP Normally Closed. Cut this link to disable the internal decimal point drive circuit and thereby

reduce the meter's current consumption.

Note:

Solder Links:

DPM 1AS-BL

3½ Digit Backlit LCD Voltmeter Module

Specifications liable to change without prior warning DPM 1AS-BL Issue 3 February/2002 M.C. Applies to DPM 1AS-BL/2

APPLICATIONS

Do not connect more than one meter to the same power supply if the meters cannot use the same signal

ground. Taking any input beyond the power supply rails will damage the meter.

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SCALING

Two external resistors Ra

and Rb may be used to

alter the full scale reading

(FSR) of the meter - see

table. The meter will have

to be re-calibrated by

adjusting the calibration

potentiometer on the rear

of the module.

FSR Ra Rb

2V 910k 100k

20V 1M 10k

(Vin) 200V 1M 1k

2000V* 1M 100R

200 A 0R 1k

2mA 0R 100R

( in) 20mA 0R 10R

200mA 0R 1R

Voltage

Current

INHI

Vin or inI

INLO

DPM 1AS-BL

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*Ensure that Ra is rated for high voltage use.

5V supply operation (3.0 to 7.5V Meter Power Supply)

9V supply operation(6.0 to 15.0V Meter Power Supply)

+3.0 to +7.5V

-3.0 to -7.5V

+3.0 to +7.5V

+6.0 to +15.0V

+3.0 to +7.5V

+6.0 to +15.0V

V+

INHI

INLO

GND

V-

±200mV

33 3

11 1

±200mV

Measuring a single ended input

voltage referenced to supply, i.e. the

input voltage and the meter's power

supply share the same 0V rail.

Ensure solder link LCOM is open.

Measuring a single ended input

voltage referenced to supply, i.e. the

input voltage and the meter's power

supply share the same 0V rail.

Ensure solder link LCOM is open.

V+

INHI

INLO

GND

V-

GND

V-

±200mV

Measuring a current from a circuit which is

floating with respect to the DPM's supply,

i.e. the current and the meter's power

supply are isolated from each other.

Ensure solder link LCOM is closed.

Measuring a current from a circuit which is

floating with respect to the DPM's supply,

i.e. the current and the meter's power

supply are isolated from each other.

Ensure solder link LCOM is closed.

Measuring an input voltage referenced to

a floating supply, i.e. the input voltage

and the meter's power supply are isolated

from each other.

Ensure solder link LCOM is closed.

Measuring an input voltage referenced to

a floating supply, i.e. the input voltage

and the meter's power supply are isolated

from each other.

Ensure solder link LCOM is closed.

BL-

DP1

No DP

DP2

DP3

XDP

BL- Rb

I+

I-

Rs=(V+ - 5V)

0.015

BL-

Rs=(V+) - (V-) - 5V

0.015

if V+>5V then

Rs=(V+ - 5V)

0.015