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DMS-40LCD Series

4½ Digit, LCD Display Digital Panel Voltmeters

MPM_DMS40LCD.D01 Page 1 of 6

Offering a unique combination of low cost, scientific-grade accuracy (±2 counts),

component-like convenience and outstanding reliability, DMS-40LCD Series 4½ Digit DPM’s

provide the ultimate combination of price, precision and convenience. These miniature

(2.17˝ x 0.92˝ x 0.43˝) digital voltmeters combine an advanced, autozeroing A/D converter,

a precision reference circuit and a large (0.4˝/10.2mm high), easy-to-read LCD display in a

single, fully encapsulated, 12-pin DIP package. All models incorporate a built-in bezel and

are easily mounted in either panels or pc boards.

Each DMS-40LCD meter has a dual-range, differential, input configuration

(±200mV/±2V, ±2V/±20V or ±20V/±200V) and is available with a backlit or non-backlit

display. Input impedance is a minimum 800kΩ, and CMRR is typically 86dB (dc to 60Hz).

CMV is ±2V, and all models are overvoltage protected to ±250V (on their non-inverting

inputs).

All DMS-40LCD meters are fully functional and operate from a single +5V supply (draw-

ing 3.5mA max.) or a single 9V supply/battery (drawing 2.5mA max.). All models feature

autopolarity changeover and overrange indication. A display HOLD function is standard on

all non-backlit models.

Thanks to their rugged epoxy-based encapsulation and their advanced, factory-cal-

ibrated A/D converters, DMS-40LCD meters are able to withstand the harshest environ-

ments and never require adjustment or calibration. Plug-in convenience, long-term stability

and wide operating temperature range (0 to +50°C) make DMS-40LCD meters the right

solution for any high-accuracy DPM requirement.

FEATURES



 Scientific-grade accuracy, ±2 counts



 Low power, typically 12.5mW



 Miniature size:

2.17" x 0.92" x 0.43" (55mm x 23mm x 11mm)



 Large (0.4”/10.2mm), enhanced-contrast, LCD display



 Backlit displays optional



 Epoxy-encapsulated, 12-pin DIP



 Panel or pc-board mountable



 3 differential, dual, input voltage ranges



 Single +5V supply or 9V battery



 User-selectable decimal point placement



 Low-battery "BAT" annunciator



 0 to +50°C temperature range



 Low Cost

SIMPLIFIED SCHEMATIC DIAGRAM

(+) INPUT HI

ANALOG

(–) INPUT LO

COMMON

REFERENCE

IN/OUT

R1

DP 1

DP 2

DP 3

6

5

4

+5V SUPPLY/

+BATTERY

9

11

12

10

8

7

1

3

DC/DC

CONVERTER

2

5V RETURN/

+5V

–BATTERY

–5V

+5V

R2

REF.

1.23V

DATA

≈+2.2V

V+

V–

A/D

CONVERTER

0 Vdc

0.01µF

J1

BA

BAT

T

HOLD/

BACKLIGHT

DC/DC converter is not used on 9V-powered models,

J1 is connected.

R1 = 100k on ±200mV/±2V (-0/1) models and 909k on all other models.

R2 is not used on ±200mV/±2V (-0/1) models.

R2 = 101k on ±2V/±20V (-1/2) models and 9.2k on ±20V/±200V (-2/3) models.

RANGE

DP 4

SELECT

Hold function is not available on backlit models.