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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-fi lm 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 specifi ed. (pending) (pending) Performance/Functional Specifi cations Typical at Ta = +25°C, fi n = 60Hz AC Input (TB1) Voltage Range ➀ 85 to 264Vac (47-63 Hz) Current Consumption @Vin = 250Vac: 30mA (max.) @Vin = 120Vac: 15mA (max.) Performance Sampling Rate 2.5 readings/second Resolution 0.1Vdc Accuracy @ +25°C ±.1V (typ.), ±.2V (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 3.6 in-lbs (0.4 N-m) 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” suffi x denotes RoHS compliance. www.murata-ps.com www.murata-ps.com/support For full details go to www.murata-ps.com/rohs Ḥ DMR20-1-ACV Self-Powered, 85 to 264Vac, LED Display Line Monitor MPM_DMR20-1-ACV.A02 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 simplifi es 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 UL/CSA approvals pending

any doubt regarding installation or operation.

  1. Measurement Type: DMR20-1-ACV series AC voltmeters employ a

nents up to 65kHz will be measured with minimal additional error.

  1. Calibration: DMR20-1-ACV voltmeters are factory calibrated; there are

no provisions for calibrating these meters in the fi eld.

  1. Operating Range: As the AC input voltage is lowered to 95.0Vac (50 or

mately one-second intervals.

  1. Panel Installation: All electrical connections to DMR20-1-ACV must

for typical panel mounting details. approximately 17 in-lbs (1.9 N-m). against environmental effects. vibration, dust, and moisture ingress.

  1. AC Input Fusing and Wiring: DMR20-1-ACV voltmeters contain an

applicable regulatory codes. used to supply power to external loads.

  1. AC Input Polarity and Grounding: The AC supply inputs TB1-A and

include, nor require, a connection to earth/chassis ground. Figure 1. Panel Installation

Dimensions are in inches (mm). Tolerances (unless otherwise specifi ed): .XX ± 0.02 (0.51) Angles ± 2˚ Components are shown for reference only. 1.50 (38.1) 1.08 (27.4) 1.18 (29.8) 0.655 (16.64) 0.55 (14) 0.080 (2.03) 0.10 (2.5) 0.062 (1.58) 0.100 (2.54) 1.210 (30.73) AC VOLTS V TRUE RMS TB1AB Recommended panel cutout 3D models are available at www.murata-ps.com/en/3d/meters.html www.murata-ps.com/support DMR20-1-ACV Self-Powered, 85 to 264Vac, LED Display Line Monitor MPM_DMR20-1-ACV.A02 Page 3 of 4 NANO

The graphs below show typical DMR20-1-ACV readings when the unit is powered from six common ac-voltage waveforms. Murata Power Solutions, Inc. makes no representation that the use of its products in the circuits described herein, or the use of other technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not imply the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifi cations are subject to change without notice. © 2013 Murata Power Solutions, Inc. www.murata-ps.com/support Murata Power Solutions, Inc. 11 Cabot Boulevard, Mansfi eld, MA 02048-1151 U.S.A. ISO 9001 and 14001 REGISTERED DMR20-1-ACV Self-Powered, 85 to 264Vac, LED Display Line Monitor MPM_DMR20-1-ACV.A02 Page 4 of 4 NANO