Datasheet DMU-30ACV Datasheet (MURATA)

TB1

TB2

CAL

BRIGHTNESS
ADJUST

REAR VIEW

85-264Vac

Power Source

Input Signal

+ –

1 2 1 2

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

DMU-30ACV Series

Ruggedized True-rms ac Voltmeters with Daylight

Readable, Auto-Dimming LED Displays

PATENT PENDING

Murata Power Solutions’ DMU-30ACV series of daylight-readable ac voltmeters mea­sure 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 rear­mounted 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.

Figure 1. DMU-30ACV wiring diagram

For full details go to

www.murata-ps.com/rohs

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 Perfor­mance 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.

www.murata-ps.com Technical enquiries email: [email protected], tel: [phone]

MPM_DMU-30ACV_B04 Page 1 of 3

DMU-30ACV Series

Ruggedized True-rms ac Voltmeters with Daylight

Readable, Auto-Dimming LED Displays

TECHNICAL NOTES (continued)

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 verified on a yearly
basis. If recalibration is necessary, it should only be performed by
qualified technical personnel. Calibration is performed with potentially
lethal voltages applied to the DMU-30ACV and its associated wiring.
A plastic, fully-insulated adjusting tool must be used to access the
recessed potentiometers located on the back of the unit (see Mechani­cal Specifications). 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
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 position. 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 Specifica­tions section for potentiometer locations.

6. 2-Wire Operation: In indoor applications where daylight readability
(i.e., maximum display brightness) is not required, DMU-30ACV meters
will meet their specified 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.

Ordering Information

Model Input Range

DMU-30ACV-0-DR-C 0 to 19.99Vac
DMU-30ACV-1-DR-C 0 to 199.9Vac
DMU-30ACV-2-DR-C 0 to 300Vac

Performance/Functional Specifications

Typical at TA = +25°C, 60Hz sine-wave input, unless otherwise noted.

Input (TB2)

Full Scale Input Range:

DMU-30ACV-0 0 – 19.99 Vac

DMU-30ACV-1 0 – 199.9 Vac

DMU-30ACV-2 0 – 300 Vac

Input-Voltage Frequency Range 47 60 1000 Hz

Performance

Sampling Rate 2.5 readings per second

Accuracy ➀

Measurement Type RMS responding, Crest Factors of 1-5

Zero Reading (within 30 sec.) “–002” “000” “002” Cnts

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

Breakdown Voltage (TB1 to TB2) 2000 – – Vdc

Supply Voltage (TB1)

DMU-30ACV 85 – 264 Vac/47-

Supply Current (TB1) ➁

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

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

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,

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 specifications

Weight 1.3 ounces (36 grams) nominal

Min. Typ. Max. Units

±0.4%FS ±2 counts w/ 60Hz

sine-wave input

63Hz

63Hz

63Hz

3½ digit, 0.56"/14.2mm high red LED

➀ Specified 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.
➁ Display reading is set to “1888”. Specified 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.

Technical enquiries email: [email protected], tel: [phone]www.murata-ps.com

MPM_DMU-30ACV_B04 Page 2 of 3

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.

Note: The supplied screws and

washers will accommodate
panel thicknesses from 0.060 to

0.090 inches (1.52 to 2.28 mm).

DMU-30ACV Series

Ruggedized True-rms ac Voltmeters with Daylight

Readable, Auto-Dimming LED Displays

Murata Power Solutions, Inc.
11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A.
Tel: [phone] [phone] Fax: [phone]

www.murata-ps.com email: [email protected] ISO 9001 and 14001 REGISTERED

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. Specifications are subject to change without
notice. © 2008 Murata Power Solutions, Inc.

PANEL INSTALLATION

12/01/08

USA: Mansfield (MA), Tel: [phone], email: [email protected]

Canada: Toronto, Tel: [phone], email: [email protected]

UK: Milton Keynes, Tel: [phone], email: [email protected]

France: Montigny Le Bretonneux, Tel: [phone], email: [email protected]

Germany: München, Tel: [phone], email: [email protected]

Japan: Tokyo, Tel: [phone], email: [email protected]

China: Shanghai, Tel: [phone], email: [email protected]

Singapore: Parkway Centre, Tel: [phone], email: [email protected]

Osaka, Tel: [phone], email: [email protected]

Guangzhou, Tel: [phone], email: [email protected]

Technical enquiries email: [email protected], tel: [phone]www.murata-ps.com

MPM_DMU-30ACV_B04 Page 3 of 3