DMU-30ACV Series

Ruggedized True-rms ac Voltmeters with Daylight

Readable, Auto-Dimming LED Displays

MPM_DMU-30ACV_B05 Page 1 of 3

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TB1

TB2

CAL

BRIGHTNESS

ADJUST

REAR VIEW

85-264Vac

Power Source

Input Signal

+–

1

2

1

2

Figure 1. DMU-30ACV wiring diagram

Murata Power Solutions’ DMU-30ACV series of daylight-readable ac voltmeters mea-

sure and display the true-rms values of complex ac waveforms. Their large 0.56” (14.2mm)

high super-bright red LED-display is readable in full sunlight. An auto-dimming circuit

automatically adjusts the display brightness for all viewing conditions.

And all DMU-30ACV ac voltmeters are packaged in a plastic package with an integrated

bezel and gasket assembly designed to meet NEMA-4/IP65 for moisture resistance in

outdoor applications.

DMU-30ACV series rms voltmeters are available in a choice of three input ranges:

20Vac (with 0.01V resolution); 200Vac (0.1V resolution); and 300Vac (1V resolution).

Because the input circuitry is electrically isolated from the unit’s operating power source,

these voltmeters can measure ac signals down to zero volts. An input frequency range

of 47-1kHz makes these voltmeters ideal for all ac voltage monitoring applications. And,

unlike conventional average-responding designs, these meters can measure and accurately

display the true-rms value of triangle waves, square waves, or any other irregularly shaped

waveform, with 0.4% full-scale accuracy.

DMU-30ACV series’ miniature size and ruggedized package is perfect for all industrial

and high-reliability instrumentation, alternative power generators, and any other application

which requires precise ac line monitoring in harsh indoor/outdoor environments. Simply

connect the input signal and an 85-264Vac source of operating power to the two rear-

mounted terminal blocks and the unit is fully operational.

FEATURES

ac voltages

brightness adjustment

NEMA-4/IP65 protection

ac power source

up to 5

TECHNICAL NOTES

1. Measurement Type: DMU-30ACV series ac voltmeters employ a precision rms-to-dc con-

verter and a stable voltage reference to measure and display the rms value of complex ac

waveforms. Crest factors as high as 5 produce minimal additional errors (see Perfor-

mance Specifications).

2. Wiring: All ac supply and input signal wiring must be adequately rated for the voltages

and currents they will carry, and must comply with any code or application-mandated

requirements pertaining to the user’s specific installation.

3. Power Supply Polarity, Fusing, and Grounding: The power supply inputs, (TB1 and

TB1-2) on DMU-30ACV voltmeters are not polarity sensitive, that is, they have no “AC LO”

or “AC HI” designations. These units do not include or require a connection to earth/chassis

ground. Refer to Figure 1 for a typical wiring diagram.

DMU-30ACV ac voltmeters are not internally fused. If fusing is required, it must be exter-

nally installed according to the supply wire’s maximum amperage rating.

IMPORTANT! To ensure safe and reliable operation, DMU-30ACV ac voltmeters must

be installed and serviced by qualified technical personnel. Contact Murata Power

Solutions / DATEL if there is any doubt regarding installation and/or operation.