DMS-20RM Series True-rms-AC Voltmeter with Isolated Inputs

Murata Power Solutions' DMS-20RM series is comprised of four-wire, self-contained AC voltmeters that measure and display the true-rms of complex AC waveforms. Since the input circuitry is electrically isolated from the unit’s operating power source, the DMS-20RM can measure signals down to zero volts. No external isolation transformers or auxiliary power supply conditioning components are required. Simply connect the input signal and a source of operating power (85 to 246 V_AC or an optional 10 to 40 V_AC) to the two rear-mounted terminal blocks, and the unit is fully operational.

DMS-20RM rms voltmeters are available in three input ranges, including 20 V_AC with 0.1V resolution, and 0 to 300 V_AC with 1V resolution. An input frequency range of 47-1kHz makes these voltmeters ideal for all AC voltage monitoring applications. Additionally, unlike conventional average-responding products, these meters can measure and accurately display the true-rms value of triangle waves, square waves, or other irregularly shaped waveforms with 0.4 percent full-scale accuracy.

The large (0.37”/9.4 mm), bright red LED display makes a DMS-20RM AC voltmeter easily readable from as far as 12 feet (4 meters). All units are packaged in red-filter cases with bullet-size bezels. Additionally, these meters are fully encapsulated to make them moisture and vibration resistant. Their miniature size is perfect for high-end consumer electronics, laboratory instrumentation, alternative power generators, and other products that require precise AC line monitoring.