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DMU-30DCV Series
Ruggedized DC Voltmeters with Daylight Readable
Auto-Dimming LED Displays
TECHNICAL NOTES (continued)
Performance/Functional Speci?cations
Typical at T A = +25°C, unless otherwise noted.
4. Calibration: Periodic recalibration of DMU-30DCV voltmeters is not required
under normal indoor operating environments. However, operation in environ-
ments 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-30DCV and
its associated wiring. A plastic, fully-insulated adjusting tool must be used
Input (TB2)
Full Scale Input Range:
DMU-30DCV-0-DR-C
DMU-30DCV-1-DR-C
DMU-30DCV-2-DR-C
DMU-30DCV-3-DR-C
Min.
0
0
0
0
Typ.
–
–
–
–
Max.
199.9
1.999
19.99
199.9
Units
mVdc
Vdc
Vdc
Vdc
to access the recessed calibration potentiometer located on the back of the
unit (see Mechanical Speci?cations). Contact Murata / DATEL if additional
information is required regarding calibration, setup, or any other technical
issue pertaining to DMU-30DCV dc voltmeters.
Performance
Sampling Rate
Accuracy
2.5 readings per second
±0.4%FS ±2 counts
5. Minimum-Intensity Adjustment Potentiometer: Users can adjust the
DMU-30DCV’s minimum LED display brightness to suit their indoor viewing
requirements by adjusting the ?-turn, rear-mounted intensity adjustment
Zero Reading (within 30 sec.)
Temperature Drift (0 to +60°C)
Breakdown Voltage (TB1 to TB2)
“–001”
–
2000
“000”
±0.2
–
“001”
±0.4
–
Cnts
Cnts/°C
Vdc
potentiometer. Please note, this potentiometer will have minimal impact on
Supply Voltage (TB1)
display brightness in high ambient light environments.
DMU-30DCV
85
–
264
Vac/47-
The intensity adjustment potentiometer is factory preset to its mid-point po-
sition. As viewed from the rear of the meter, and with the model number label
Supply Current (TB1) ?
63Hz
facing up, turning the potentiometer clockwise increases the LED display’s
DMU-30DCV (total darkness)
–
4
6
mA/47-
intensity. See the Mechanical Speci?cations section for potentiometer loca-
63Hz
tions.
DMU-30DCV (full sunlight)
–
40
50
mA/47-
6. Operation with Power Supplies Lower than 85Vac: In indoor applications
where daylight readability (i.e., maximum display brightness) is not required,
Terminal Block Wiring (TB1 & TB2)
63Hz
DMU-30DCV meters will meet their speci?ed accuracy with ac supply volt-
ages (TB1) well below 85Vac. While performance is not guaranteed, DMU-
30DCV voltmeters remain easily readable and accurate with ac supplies as
low as 20Vac.
7. Panel Installation: All electrical connections to DMU-30DCV must be made
after the meter is securely attached to the panel and with all input and
supply voltages de-energized (off). Care must be exercised when attach-
ing conductors to terminal blocks TB1 and TB2. The installed wire-positions
should be such that minimal forces are applied to the terminal blocks or the
voltmeter. In high-vibration environments, adequate strain reliefs must be
used on all input and supply wiring.
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_ _ _ "
To ensure a secure and moisture/vibration resistant installation, use only
the supplied hardware. Following the four-step sequence shown—being
careful not to apply excessive force or twisting motions—insert the voltmeter
Operating Temperature
Storage Temperature
Humidity (non-condensing)
–25
–40
0
–
–
–
+60
+75
85
°C
°C
%
into the panel opening. Tighten all six M3 metric screws to 3 inch-pounds
(0.34Nm). See the Mechanical Speci?cations section for panel cutout, drill
dimensions, and panel installation information.
Dimensions
Weight
See mechanical speci?cations
1.3 ounces (36 grams) nominal
? Display reading is set to “1888”. Speci?ed power supply currents are steady state; larger
Ordering Information
Model
DMU-30DCV-0-DR-C
DMU-30DCV-1-DR-C
DMU-30DCV-2-DR-C
DMU-30DCV-3-DR-C
Input Range
0 to ±199.9mVdc
0 to ±1.999Vdc
0 to ±19.99Vdc
0 to ±199.9Vdc
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_30DCV.A09 Page 2 of 3
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