DMU-30DCV-2-DR-C【PDF 1/3 页】VOLT METER LED 20DCV 0.01V RED

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www.murata-ps.com

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

DMU-30DCV Series

Ruggedized DC Voltmeters with Daylight Readable

Auto-Dimming LED Displays

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.

TECHNICAL NOTES

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

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

there is any doubt regarding installation and/or operation.

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

performance by employing a precision integrating analog-to-digital converter, metal ?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 ?ltering is provided,

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

CAL

BRIGHTNESS

ADJUST

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 speci?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”

TB1

TB2

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 speci?ed in the Functional Speci?cations section must be used for making connec-

REAR VIEW

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

85-264Vac

Power Source

Input Signal

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

Figure 1. DMU-30DCV wiring diagram

For full details go to

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.

www.murata-ps.com/rohs

www.murata-ps.com/support

MPM_DMU_30DCV.A09 Page 1 of 3

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