Murata Power Solutions’ new DMR20-10-DCM self-powered, auto-ranging DC voltage

monitors are designed to measure and display the outputs the most popular DC power

systems. Simply connect any 6 to 75V DC power source and these meters are fully opera-

tional—no additional components or power sources are required.

Their large, 0.30"/7.6mm, bright LED displays can be easily read from 10 feet away (3

meters). These auto-ranging meters accurately display DC voltages with 0.01V in the LO

Range (below 51V), or 0.1V resolution in the HI Range (above 51 V). A built-in resettable

fuse assures long term reliability. All DMR20-10-DCM’s employ a 13-bit A/D converter

and precision metal-film resistors to achieve outstanding performance over an operating

temperature range of –25 to +60°C.

The DMR20-10-DCM is housed in a rugged, round polycarbonate case that provides excel-

lent protection against moisture, dust, shock and vibration. Panel installation is straightfor-

ward: using readily available tooling, simply drill and punch a 1.2 inch (30.5mm) diameter

hole and anti-rotation notch, insert the meter and gasket into the panel, and securely fasten

the meter using the supplied hex nut. The supplied hardware is designed to provide protec-

tion to IP67/NEMA 6.

➀ Operation and accuracy at inputs above or below these ranges are not specified.

➁ When auto-range operation is enabled via jumper JP1 and Vin is between 6V to 51V, the

displayed resolution is 0.01V (i.e., the unit is in LO Range). When Vin is 51V and above, display

resolution is 0.1V (i.e., the unit is in HI Range). When the unit is in the HI range and Vin drops

below 49V, it will auto-range back to the LO Range.

➂ When Vin is between 75V and 80V, the display will alternate from dim to normal intensity at

approximately one second intervals. When Vin exceeds 80V, display will flash on and completely

off at approximately one second intervals. Continuous operation above 80V will permanently

damage the meter and void its warranty.

Performance/Functional Specifications

Typical at Ta = +25°C, unless otherwise noted

DC Input (TB1)

Input voltage range

➀

+6 to +75Vdc

Current Consumption

@Vin = 75.0Vdc: 7mA (max.)

Reverse Polarity Protection -100Vdc (min.)

Performance

Sampling Rate

2.5 readings/second

Resolution

0.01Vdc in LO Range;

0.1Vdc in HI Range

Accuracy @ +25°C

HI Range

➁

±0.2V (typ.), ±0.4V (max.)

LO Range

➁

±0.03V (typ.), ±0.06V (max.)

Overrange Indication

➂

See note 3

Temperature Drift

±0.003V/°C (typ.)

Mechanical

Dimensions

1.50"diameter x 1.08 depth"

(38.1 x 27.4mm)

Display Type

Four digit, LED, 0.30" high (7.6mm)

Weight

0.6 ounces (18 grams)

with nut and gasket

Case Material

Polycarbonate

Terminal Block Torque

3.6 in-lbs (0.4 N-m)

Wire Size And Type

solid or stranded

Wire Insulation Strip Length 0.25" (6.4mm)

Environmental

Operating Temperature

–25 to +60°C

Storage Temperature

–40 to +75°C

Humidity (non-condensing) 0 to 85%

Ordering Information

DMR20-10-DCM-R-C

6 to 75Vdc voltage monitor (Red LED)

Tooling

DMR20-1-KP

1.2" (30.5mm) Round knockout punch

(no keying notch)

DMR20-2-KP

1.2" (30.5mm) Round knockout punch

(with four keying notches)

DMR20-3-KP

1/8" and 3/16" (3.2 and 4.7mm)

key-notch nibbler tool

Note: An M30 x 1.5 nylon hex nut and EPDM sealing gasket are supplied with each meter.

The “-C” suffix denotes RoHS compliance.

www.murata-ps.com

www.murata-ps.com/support

For full details go to

www.murata-ps.com/rohs

　

DMR20-10-DCM

2-Wire, Self-Powered,

Auto-Ranging DC Voltage Monitor

MPM_DMR20-10-DCM.A01 Page 1 of 4

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