www.murata-ps.com
DMU-30ACV Series
Ruggedized True-rms ac Voltmeters with Daylight
Readable, Auto-Dimming LED Displays
FEATURES
■
Measures and displays the true-rms value of complex
ac voltages
Three input ranges: 20Vac, 200Vac and 300Vac
Daylight-readable LED display with automatic
brightness adjustment
Moisture & impact resistant package offers
NEMA-4/IP65 protection
Operates from universal 85-264Vac or 110-300Vdc
Input circuit fully isolated from operating
ac power source
47-1kHz input frequency range with crest factors
up to 5
UL certification pending
■
■
■
■
■
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.
■
■
TECHNICAL NOTES
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.
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.
TB2
+
–
CAL
BRIGHTNESS
ADJUST
1
TB1
2
1
2
REAR VIEW
85-264Vac
Power Source
Input Signal
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.
Figure 1. DMU-30ACV wiring diagram
For full details go to
www.murata-ps.com/rohs
www.murata-ps.com
Technical enquiries
email: sales@murata-ps.com, tel:
+1 508 339 3000
MPM_DMU-30ACV_B05
Page 1 of 3
MURATA [ MURATA MANUFACTURING CO., LTD. ]
