Murata Power Solutions’ new DMR20-1-ACV self-powered, AC line-voltage monitors are

designed to measure and display the true-rms voltage of AC power systems. Simply con-

nect any 85 to 264Vac 50/60Hz power source and these meters are fully operational—no

additional components or power sources are required. The unit can also measure distorted

AC power sources including triangle, square, and the quasi-sine output of many DC to AC

power inverters.

The DMR20-1-ACV is housed in a rugged, round polycarbonate case that provides excellent

protection against moisture, dust, shock and vibration. Panel installation is straightforward:

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, and securely fasten the meter using the sup-

plied hex nut. The supplied hardware is designed to provide protection to IP67/NEMA 6.

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

meters). These meters accurately display ac voltages with 0.1V resolution. A built-in reset-

table fuse assures long term reliability. All DMR20-1-ACVs 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.

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

Performance/Functional Specifications

Typical at Ta = +25°C, Vin = 250Vac / 60Hz sine wave, unless

otherwise noted

AC Input (TB1)

Voltage Range

➀

85 to 264Vac (47-63 Hz)

Current Consumption

@Vin = 250Vac: 30mA (max.)

@Vin = 120Vac: 15mA (max.)

UL/IEC61010-1

Measurement Category II

Performance

Sampling Rate

2.5 readings/second

Resolution

0.1Vac

Accuracy @ +25°C

±0.6Vac (typ.), ±1.3Vac (max.)

Temperature Drift

(–25 to +60°C) ±0.05V/°C (max.)

Mechanical

Dimensions

1.50"diameter x 1.15 depth"

(38.1 x 29.2mm)

Display Type

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

Weight

0.8 ounce (23 grams)

Case Material

Polycarbonate

Terminal Block Torque

2.2 lb·in (0.25 N·m) ±20%

Wire Size And Type

18-22AWG (0.83-0.33mm2) copper,

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

DMR20-1-ACV-R-C 85 to 264Vac voltage monitor (Red LED)

Knockout Punches

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.

E156931

www.murata-ps.com

www.murata-ps.com/support

For full details go to

www.murata-ps.com/rohs

DMR20-1-ACV

Self-Powered,

85 to 264Vac, LED Display Line Monitor

MPM_DMR20-1-ACV.B03 Page 1 of 4

NANO

FEATURES

„ Universal 85 to 264Vac measurement range

„ Self-powered directly from the AC supply

„ Installs in “oiltight”1.20 inch (30.5mm) round cutouts

„ Four-digit LED display with overvoltage indication

„ Reads true-rms value to 0.1V resolution

„ Knockout punches and tooling available

„ Digital replacement for analog panel meters

„ Screw-style terminal block simplifies installation

„ Self-resetting internal fuse for long-term reliability

„ Provides moisture resistance to IP67/NEMA 6

„ Supplied with EPDM rubber gasket and plastic hex nut

„ Approvals to UL/cUL/IEC/ 61010-1