DMU-30DCV-3-DR-C Datasheet DMU-30DCV-0-DR-C, DMU-30DCV-2-DR-C, DMU-30DCV-3-DR-C | P1-P3

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TB1

TB2

CAL

BRIGHTNESS

ADJUST

REAR VIEW

Fused 85-264Vac

Power Source

Input Signal

1 2 1 2

Figure 1. DMU-30DCV wiring diagram

DMU-30DCV Series

Ruggedized DC Voltmeters with Daylight Readable

Auto-Dimming LED Displays

MPM_DMU_30DCV.A08 Page 1 of 3

Murata Power Solutions’ DATEL branded DMU-30DCV series of daylight-readable dc

voltmeters measure and display dc signals as low as ±200mV and as high as ±200V. 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.

DMU-30DCV series dc voltmeters are packaged in a rugged, one-piece polycarbonate

plastic housing that features an integrated bezel and gasket assembly. In a typical instal-

lation, the housing is secured to a panel with six metallic threaded inserts, allowing the

unit to meet NEMA-4 / IP65 requirements for moisture and impact resistance in outdoor

applications.

DMU-30DCV series dc voltmeters are available in a choice of four input ranges:

±200mVdc (with 0.1mV resolution); ±2Vdc (0.001V resolution); ±20Vdc (0.01V resolution);

and ±200Vdc (0.1V resolution). The dc signal under measurement is electrically isolated

from the unit’s operating power source.

DMU-30DCV series’ miniature size and rugged package are perfect for industrial and

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

which requires daylight readability and precise monitoring of dc voltages in harsh indoor /

outdoor environments. Simply connect the input signal and an 85-264Vac source of operat-

ing power to the two rear-mounted terminal blocks and the unit is fully operational.

FEATURES

■

Measure and accurately display dc voltages in harsh

environments

■

Four input ranges: ±200mVdc, ±2Vdc, ±20Vdc, and

±200Vdc

■

Daylight-readable LED display with automatic

brightness adjustment

■

Moisture & impact resistant package offers

NEMA-4/IP65 protection

■

Operates from universal 85-264Vac mains, or

110-300Vdc supplies

■

Input circuit fully isolated from ac power supply

TECHNICAL NOTES

1. Measurement Type: All DMU-30DCV series dc voltmeters achieve their excellent

performance by employing a precision integrating analog-to-digital converter, metal ﬁ lm

resistor dividers, and a high-stability voltage reference IC. The LED display is updated

approximately 2.5 to 3 times per second. However, while some input ﬁ ltering is provided,

noisy signals may cause the displayed reading to vary by a few counts.

2. Wiring: All ac supply (TB1) and input signal (TB2) 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 speciﬁ c installation.

3. Power Supply Polarity, Fusing, Wiring and Grounding: The power supply inputs (TB1-1 and

TB1-2) on DMU-30DCV 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/chas-

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

Wires speciﬁ ed in the Functional Speciﬁ cations section must be used for making connec-

tions to DMU-30DCV series voltmeters. All power-supply and load wiring must be rated

for the supply voltages and currents they will conduct and must comply with any code or

application-mandated requirements pertaining to the user’s speciﬁ c installation.

DMU-30DCV voltmeters are not internally fused. Terminal block TB1 is to be used only

for powering the power meter’s internal circuitry; it must not be used to supply power

to external loads. The supply wires feeding these power meters must be fused with a

0.5A/250V time delay/time lag fuse, in accordance with applicable regulatory codes.

Wire insulation must be stripped to within ±10% of the stated dimensions, and wires

should be inserted into TB1 such that their insulation is not pinched by the screw terminal.

IMPORTANT! To ensure safe and reliable operation, DMU-30DCV dc voltmeters must

be installed and serviced by qualiﬁ ed technical personnel. Contact Murata / DATEL if

there is any doubt regarding installation and/or operation.

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DMU-30DCV Series

Ruggedized DC Voltmeters with Daylight Readable

Auto-Dimming LED Displays

MPM_DMU_30DCV.A08 Page 2 of 3

TECHNICAL NOTES (continued)

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 veriﬁ ed on a yearly basis. If recalibration is necessary,

it should only be performed by qualiﬁ 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

to access the recessed calibration potentiometer located on the back of the

unit (see Mechanical Speciﬁ cations). Contact Murata / DATEL if additional

information is required regarding calibration, setup, or any other technical

issue pertaining to DMU-30DCV dc voltmeters.

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 ¾-turn, rear-mounted intensity adjustment

potentiometer. Please note, this potentiometer will have minimal impact on

display brightness in high ambient light environments.

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

facing up, turning the potentiometer clockwise increases the LED display’s

intensity. See the Mechanical Speciﬁ cations section for potentiometer loca-

tions.

6. Operation with Power Supplies Lower than 85Vac: In indoor applications

where daylight readability (i.e., maximum display brightness) is not required,

DMU-30DCV meters will meet their speciﬁ 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.

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

into the panel opening. Tighten all six M3 metric screws to 3 inch-pounds

(0.34Nm). See the Mechanical Speciﬁ cations section for panel cutout, drill

dimensions, and panel installation information.

Performance/Functional Speciﬁ cations

Typical at TA = +25°C, unless otherwise noted.

➀ Display reading is set to “1888”. Speciﬁ 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.

Input (TB2)

Min. Typ. Max. Units

Full Scale Input Range:

DMU-30DCV-0-DR-C 0 – 199.9 mVdc

DMU-30DCV-1-DR-C 0 – 1.999 Vdc

DMU-30DCV-2-DR-C 0 – 19.99 Vdc

DMU-30DCV-3-DR-C 0 – 199.9 Vdc

Performance

Sampling Rate 2.5 readings per second

Accuracy ±0.4%FS ±2 counts

Zero Reading (within 30 sec.) “–001” “000” “001” Cnts

Temperature Drift (0 to +60°C) – ±0.2 ±0.4 Cnts/°C

Breakdown Voltage (TB1 to TB2) 2000 – – Vdc

Supply Voltage (TB1)

DMU-30DCV 85 – 264 Vac/47-

63Hz

Supply Current (TB1) c

DMU-30DCV (total darkness) – 4 6 mA/47-

63Hz

DMU-30DCV (full sunlight) – 40 50 mA/47-

63Hz

Terminal Block Wiring (TB1 & TB2)

Wire Size 16-22 AWG, Solid or stranded

Insulation Strip Length 0.250 inches (6.35)

Screw Tightening Torque 3.6 pound-inches (0.4Nm)

Rated Voltage 300Vac

Display

Display Type and Size Daylight readable, auto-dimming,

3½ digit, 0.56"/14.2mm high red LED

Decimal Point Fixed, model dependent

Overrange Indication "1_ _ _"

Physical/Environmental

Operating Temperature –25 – +60 °C

Storage Temperature –40 – +75 °C

Humidity (non-condensing) 0 – 85 %

Dimensions See mechanical speciﬁ cations

Weight 1.3 ounces (36 grams) nominal

Ordering Information

Model Input Range

DMU-30DCV-0-DR-C 0 to ±199.9mVdc

DMU-30DCV-1-DR-C 0 to ±1.999Vdc

DMU-30DCV-2-DR-C 0 to ±19.99Vdc

DMU-30DCV-3-DR-C 0 to ±199.9Vdc

Murata Power Solutions, Inc. makes no representation that the use of its products in the circuits described herein, or the use of other

technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not imply

the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Speciﬁ cations are subject to change without

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Murata Power Solutions, Inc.

11 Cabot Boulevard, Mansﬁ eld, MA 02048-1151 U.S.A.

ISO 9001 and 14001 REGISTERED

1.60

(40.64)

2.85

(72.39)

1.5

(38.1)

2.52

(64.00)

1.26

(32.00)

1.30

(33.02)

0.878

(22.3)

2.118

(53.8)

RECOMMENDED DRILL AND PANEL CUTOUT

PANEL CUTOUT

Mechanical Dimensions: Inches (mm)

Tolerances: 2 PL DEC ±0.02 (±0.51)

3 PL DEC ±0.010 (±0.254)

M3 INSERT

0.10 (2.54) DEPTH

INTERNAL CORNER RADII

0.032 (0.81) MAX.

0.136 (3.45) DIA

(6 REQUIRED)

VIN

SIGNAL

INPUT

PWR

SUPPLY

INPUT

TB1

TB2

CAL

BRIGHTNESS

ADJUST

0.26

(6.6)

REAR VIEW FRONT VIEW

1.97

(50.0)

1 2 1 2

Step 2. Step 3. Step 4.Step 1.

PANEL INSTALLATION

Note: The supplied M3 screws

and washers will accommodate

panel thicknesses from 0.060 to

0.090 inches (1.52 to 2.28 mm).

Tighten screws to 3.5–4.5 in-lbs

(0.4–0.5 Nm).

DMU-30DCV Series

Ruggedized DC Voltmeters with Daylight Readable

Auto-Dimming LED Displays

MPM_DMU_30DCV.A08 Page 3 of 3

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DMU-30DCV-3-DR-C

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