DMS-20PC 데이터 시트보기 (PDF) - DATEL Data Acquisition products

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DMS-20PC

3½ Digit, LED Display Low-Cost, Subminiature Digital Panel Voltmeters

DATEL Data Acquisition products  

®

®

DMS-20PC Series

Actual Size

3½ Digit, LED Display

Low-Cost, Subminiature

Digital Panel Voltmeters

Features

• Lowest-cost LED meters

• Subminiature size:

1.38" x 0.88" x 0.48"

35mm x 22mm x 12mm

• Large (0.37"/9.4mm) LED display

• Choice of 5 LED colors

• High-intensity or low-power (7mA) red

LED's optional

• Epoxy-encapsulated, 12-pin DIP package

with built-in color filter and bezel

• 4 differential input voltage ranges

• Factory calibrated, ±1 count accuracy

• Single +5V power supply

• User-selectable decimal point placement

• DISPLAY ENABLE function for

"power-down" mode

• DISPLAY TEST and HOLD (optional)

functions

• 0 to +60°C temperature range

DMS-20PC Series, 3½ Digit, LED Display, Digital Panel Voltmeters combine a

precision A/D converter; a factory-trimmed, highly stable, voltage reference; and a

large (0.37"/9.4mm), easy-to-read LED display in a single package that is only slightly

larger than the display itself. Displays are offered in either red, orange, amber, yellow

or green colors. High-intensity and low-power (35mW total) red LED's are also

optional.

These low-cost meters are fully self-contained and fully functional. Their submin-

iature (1.38" x 0.88" x 0.48"), epoxy-encapsulated cases incorporate built-in color

filters and bezels; are moisture and vibration proof; and function well in the harshest

environments. Their 12-pin, dual-in-line configuration offers component-like, plug-in

convenience and maximum versatility. Operating temperature range is 0 to +60°C.

The meters come with one of four, differential, input voltage ranges: ±200mV, ±2V

±20V or ±200V. Input impedance is a minimum 800kΩ. CMRR is typically 86dB (dc

to 60Hz), and CMV is ±2V. Input overvoltage protection (on the non-inverting input)

is ±250V. Devices are fully calibrated at the factory to an accuracy of ±1 count

(±0.05% of full scale range) and never require calibration or adjustment.

A DISPLAY ENABLE function permits the display to be disabled for "power-

down" operation. All models have a DISPLAY TEST function. Red LED models offer

an optional DISPLAY HOLD function.

Small size, low cost and adjustment-free reliability make the DMS-20PC Series

the best choice for all your 3½ digit, LED, DPM applications.

1

+5V SUPPLY

DISPLAY 2

ENABLE

3

5V RETURN

4

DP 3

5

DP 2

6

DP 1

+5V

V+

–5V

DC/DC

CONVERTER

V–

0 Vdc

A/D

CONVERTER

DATA

0.01 2

µF

» +2.0V

R2 1

R1

909k

12

(–) INPUT LO

11

(+) INPUT HI

10 ANALOG

COMMON

9 DISPLAY 3

TEST/HOLD

8

+5V

REFERENCE OUT

7

REFERENCE IN

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

R2 = 100k on ±20V (-2) models and 9.1k on ±200V (-3) models.

2 Only used on ±200mV (-0) and ±2V (-1) models.

3 Pin 9 is DISPLAY TEST on all but four models. On those models

(-H option), it is DISPLAY HOLD.

Figure 1. DMS-20PC Series Simplified Schematic

DATEL, Inc., 11 Cabot Boulevard, Mansfield, MA 02048-1151 (U.S.A.) • Tel: (508) 339-3000 Fax: (508) 339-6356 • For immediate assistance: (800) 233-2765

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