Murata Power Solutions Supplier Page

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


DMS-20RM series AC voltmeters from Murata Power Solutions are perfect for applications requiring precise AC line monitoring


DMS-20RM Series AC VoltmetersMurata 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 246VAC or an optional 10 to 40VAC) to the two rear-mounted terminal blocks, and the unit is fully operational.

DMS-20RM rms voltmeters are available in three input ranges, including 20VAC with 0.1V resolution, and 0 to 300VAC 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”/9.4mm), 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. Datasheet

Features
  • Input circuit fully isolated from operating power supply
  • Fully encapsulated plastic package measures 1.38" x 0.88" (35mm x 22.4mm)
  • Large, easy-to-read, red LED display is
    visible from 12ft (4m)
  • Measures the rms value of complex AC voltages
  • Three input ranges: 20VAC, 200VAC, and 300VAC
  • Two operating supply options: 85-264VAC or 10-40VDC
  • 47-1kHz input frequency range
  • Lead free and RoHS compliant

Product Training Module (PTM): DMS-20RM Series Product Training Module (PTM):
DMS-20RM Series

Digi-Key P/N Murata P/N Description
811-1987-ND DMS-20RM-1-DC2-R-C AC VOLTMETER 20V RANGE DC POWER
811-1984-ND DMS-20RM-1-AC1-R-C AC VOLTMETER 20V RANGE AC POWER
811-1985-ND DMS-20RM-2-AC1-R-C AC VOLTMETER 200V RANGE AC POWER
811-1988-ND DMS-20RM-2-DC2-R-C AC VOLTMETER 200V RANGE DC POWER
811-1989-ND DMS-20RM-3-DC2-R-C AC VOLTMETER 300V RANGE DC POWER
811-1986-ND DMS-20RM-3-AC1-R-C AC VOLTMETER 300V RANGE AC POWER