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DMU-30ACV Series
Ruggedized True-rms ac Voltmeters with Daylight
Readable, Auto-Dimming LED Displays
TECHNICAL NOTES (continued)
Performance/Functional Speci?cations
Typical at T A = +25°C, 60Hz sine-wave input, unless otherwise noted.
4. Calibration: Periodic recalibration of DMU-30ACV voltmeters is
not required under most indoor operating environments. However,
units operating in environments subject to vibration and/or extreme
temperature variations should have their accuracy veri?ed on a yearly
basis. If recalibration is necessary, it should only be performed by
quali?ed technical personnel. Calibration is performed with potentially
lethal voltages applied to the DMU-30ACV and its associated wiring.
Input (TB2)
Full Scale Input Range:
DMU-30ACV-0
DMU-30ACV-1
DMU-30ACV-2
Input-Voltage Frequency Range
Min.
0
0
0
47
Typ.
–
–
–
60
Max.
19.99
199.9
300
1000
Units
Vac
Vac
Vac
Hz
A plastic, fully-insulated adjusting tool must be used to access the
recessed potentiometers located on the back of the unit (see Mechani-
cal Speci?cations). Contact Murata / DATEL if additional information
is required regarding calibration, setup, or any other technical issue
pertaining to DMU-30ACV ac voltmeters.
5. Minimum-Intensity Adjustment Potentiometer: Users can adjust
the DMU-30ACV’s minimum LED display brightness to suit their indoor
Performance
Sampling Rate
Accuracy ?
Measurement Type
Zero Reading (within 30 sec.)
2.5 readings per second
±0.4%FS ±2 counts w/ 60Hz
sine-wave input
RMS responding, Crest Factors of 1-5
“–002” “000” “002” Cnts
viewing requirements by adjusting the ?-turn, rear-mounted intensity
adjustment potentiometer. Please note, this potentiometer will have
Temperature Drift (0 to +60°C)
Breakdown Voltage (TB1 to TB2)
–
2000
±0.2
–
±0.4
–
Cnts/°C
Vdc
minimal impact on display brightness in high ambient light environ-
Supply Voltage (TB1)
ments.
DMU-30ACV
85
–
264
Vac/47-
The intensity adjustment potentiometer is factory preset to its mid-
point position. As viewed from the rear of the meter, and with the
Supply Current (TB1) ?
63Hz
model number label facing up, turning the potentiometer clockwise
DMU-30ACV (total darkness)
–
4
6
mA/47-
increases the LED display’s intensity. See the Mechanical Speci?ca-
63Hz
tions section for potentiometer locations.
DMU-30ACV (full sunlight)
–
40
50
mA/47-
6. 2-Wire Operation: In indoor applications where daylight readability
(i.e., maximum display brightness) is not required, DMU-30ACV meters
Terminal Block Wiring (TB1 & TB2)
63Hz
will meet their speci?ed accuracy with ac supply voltages (TB1) well
below 85Vac. While performance is not guaranteed, DMU-30ACV
voltmeters’ remain easily readable and accurate with ac supplies as
low as 20Vac in most indoor environments.
Please note, when operated indoors in a 2-wire mode (i.e., TB1 and
TB2 are connected to the same ac voltage), DMU-30ACV series’ input
current will increase as the input supply is decreased. At 20Vac, the
input supply current will be approximately 30mA.
Wire Size
Insulation Strip Length
Screw Tightening Torque
Rated Voltage
Display
Display Type and Size
Decimal Point
Overrange Indication
Physical/Environmental
16-22 AWG, Solid or stranded
0.250 inches (6.35)
2.2 lb·in (0.25 N·m) ±20%
300Vac
Daylight readable, auto-dimming,
3? digit, 0.56"/14.2mm high red LED
Fixed, model dependent
"1_ _ _ "
Ordering Information
Operating Temperature
Storage Temperature
–25
–40
–
–
+60
+75
°C
°C
Model
Input Range
Humidity (non-condensing)
0
–
85
%
DMU-30ACV-0-DR-C
DMU-30ACV-1-DR-C
DMU-30ACV-2-DR-C
0 to 19.99Vac
0 to 199.9Vac
0 to 300Vac
Dimensions
Weight
See mechanical speci?cations
1.3 ounces (36 grams) nominal
? Speci?ed accuracy applies to inputs with crest factors (CF) up to 2.0, where CF = Vpeak/
Vrms. Crest factors of 2-5 introduce an additional eror of ±3% of full scale. Voltmeters
are calibrated with near full-scale, 60Hz sine-wave input.
? Display reading is set to “1888”. Speci?ed power supply currents are steady state; larger
surge currents can occur at initial application of ac power. Power supply input (TB1) set to
120Vac/60 Hz.
www.murata-ps.com/support
MPM_DMU-30ACV.B09 Page 2 of 3
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