+1.23V REFERENCE OUT

(+) INPUT HI

(–) INPUT LO

ANALOG

COMMON

REFERENCE OUT

REFERENCE IN

+5V SUPPLY

R1

DP 1

DP 2

DP 3

6

5

4

9

11

12

10

8

7

1

3

DC/DC

CONVERTER

2

DISPLAY TEST

5V RETURN

+5V

–5V

+5V

1.23V

REF.

R2

+2.0V

DATA

909k

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.

V+

V–

A/D

CONVERTER

0 Vdc

0.01µF

1.82k

»

(1)

(1)

Figure 1. DMS-30PC Series simplified schematic

DMS-30PC Series

3½ Digit, LED Display Low-Power,

Miniature Digital Panel Voltmeters

MPM_DMS_30PC.G01 Page 1 of 6

www.murata-ps.com

www.murata-ps.com/support

For full details go to

www.murata-ps.com/rohs

The DMS-30PC Series is a broad line of self-contained, fully operational, 3½ digit volt-

meters with large, easy-to-read LED displays. The 0.56"(14.2mm) high LED's are available

in a wide variety of colors including red, orange, amber, yellow, green, aqua, blue-green, and

super-blue. A high-intensity version of the red display is optional, as are low-power versions

of the red, orange, and green displays.

The small size (2.17" x 0.92" x 0.56") of DMS-30PC meters is achieved by integrating

their display, display drivers, reference circuit, and A/D converter into in a single, epoxy-

encapsulated assembly. The device's 12-pin, component-like, DIP package is both vibration

and moisture proof. Each package incorporates a built-in color filter and bezel and is easily

mounted in either panels or pc cards.

These meters are available in four differential input voltage ranges (±200mV, ±2V, ±20V

and ±200V). Input impedance is 1,000 megohms for the ±200mV and ±2V inputs and 1

megohm for the ±20V and ±200V inputs. CMRR for all devices is 86dB, and inputs are over-

voltage protected to ±250V.

Each meter incorporates an extremely stable, double-regulated reference and is fully

calibrated prior to potting. We guarantee outstanding initial accuracy (±1 count) and excellent

stability (±0.15 counts/°C). All models operate from a single +5V supply, and the low-power

models draw as little as 10mA (50mW total power). A DISPLAY TEST function is standard on

each device.

For popular applications (4-to-20mA, rms-to-dc conversion, ac line power, J and K ther-

mocouples, etc.), the DMS-30PC Series includes a complete line of optional "plug-on" appli-

cation boards that conveniently convert your meter into an application-specific instrument.

FEATURES



 Large (0.56"/14.2mm) LED display



 8 LED colors



 Low-power LED’s optional



 Epoxy-encapsulated, 12-pin DIP with built-in color filter

and bezel



 Miniature size:

2.17" x 0.92" x 0.56"(55mm x 23mm x 14mm)



 Panel or pc-board mountable



 4 differential input voltage ranges



 Auto-calibration, ±1 count accuracy



 User-selectable decimal point placement



 Single +5V supply (60mW for low-power models)



 0 to +60°C temperature range



 Numerous "plug-on" application boards



 Low cost

SIMPLIFIED SCHEMATIC DIAGRAM