DMU-30ACV Series www.murata-ps.com Ruggedized True-rms ac Voltmeters with Daylight Readable, Auto-Dimming LED Displays Murata Power Solutions’ DMU-30ACV series of daylight-readable ac voltmeters mea- sure 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 FEATURES display the true-rms value of triangle waves, square waves, or any other irregularly shaped Measures and displays the true-rms value of complex waveform, with 0.4% full-scale accuracy. ac voltages DMU-30ACV series’ miniature size and ruggedized package is perfect for all industrial and high-reliability instrumentation, alternative power generators, and any other application Three input ranges: 20Vac, 200Vac and 300Vac which requires precise ac line monitoring in harsh indoor/outdoor environments. Simply Daylight-readable LED display with automatic connect the input signal and an 85-264Vac source of operating power to the two rear- brightness adjustment mounted terminal blocks and the unit is fully operational. 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 TECHNICAL NOTES 47-1kHz input frequency range with crest factors IMPORTANT! To ensure safe and reliable operation, DMU-30ACV ac voltmeters must up to 5 be installed and serviced by qualifi ed technical personnel. Contact Murata Power Solutions if there is any doubt regarding installation and/or operation. 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 Perfor- mance Specifi cations). 2. Wiring: All ac supply and input signal wiring must be adequately rated for the voltages CAL BRIGHTNESS and currents they will carry, and must comply with any code or application-mandated ADJUST 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-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/ 1 2 1 2 chassis ground. Refer to Figure 1 for a typical wiring diagram. TB1 TB2 Wires specifi ed in the Functional Specifi cations section must be used for making connec- tions to DMU-30ACV series voltmeters. All power-supply and load wiring must be rated REAR VIEW 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. 85-264Vac Input Signal Power Source DMU-30ACV 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 Figure 1. DMU-30ACV wiring diagram 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. For full details go to www.murata-ps.com/rohs www.murata-ps.com/support MPM_DMU-30ACV.C02 Page 1 of 3

DMU-30ACV Series Ruggedized True-rms ac Voltmeters with Daylight Readable, Auto-Dimming LED Displays TECHNICAL NOTES (continued) Performance/Functional Specifi cations Typical at TA = +25°C, 60Hz sine-wave input, unless otherwise noted. 4. Calibration: Periodic recalibration of DMU-30ACV voltmeters is Input (TB2) Min. Typ. Max. Units not required under most indoor operating environments. However, Full Scale Input Range: units operating in environments subject to vibration and/or extreme DMU-30ACV-0 0 – 19.99 Vac temperature variations should have their accuracy verifi ed on a yearly basis. If recalibration is necessary, it should only be performed by DMU-30ACV-1 0 – 199.9 Vac qualifi ed technical personnel. Calibration is performed with potentially DMU-30ACV-2 0 – 300 Vac lethal voltages applied to the DMU-30ACV and its associated wiring. Input-Voltage Frequency Range 47 60 1000 Hz A plastic, fully-insulated adjusting tool must be used to access the re- Performance cessed potentiometers located on the back of the unit (see Mechanical Sampling Rate 2.5 readings per second Specifi cations). Contact Murata Power Solutions if additional informa- tion is required regarding calibration, setup, or any other technical Accuracy ➀ ±0.4%FS ±2 counts w/ 60Hz sine-wave input issue pertaining to DMU-30ACV ac voltmeters. Measurement Type RMS responding, Crest Factors of 1-5 5. Minimum-Intensity Adjustment Potentiometer: Users can adjust Zero Reading (within 30 sec.) “–002” “000” “002” Cnts the DMU-30ACV’s minimum LED display brightness to suit their indoor viewing requirements by adjusting the ¾-turn, rear-mounted intensity Temperature Drift (0 to +60°C) – ±0.2 ±0.4 Cnts/°C adjustment potentiometer. Please note, this potentiometer will have Breakdown Voltage (TB1 to TB2) 2000 – – 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- 63Hz point position. As viewed from the rear of the meter, and with the Supply Current (TB1) ➁ 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 Specifi 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 63Hz (i.e., maximum display brightness) is not required, DMU-30ACV meters Terminal Block Wiring (TB1 & TB2) will meet their specifi ed accuracy with ac supply voltages (TB1) well Wire Size 16-22 AWG, Solid or stranded below 85Vac. While performance is not guaranteed, DMU-30ACV Insulation Strip Length 0.250 inches (6.35) voltmeters’ remain easily readable and accurate with ac supplies as Screw Tightening Torque 2.2 lb·in (0.25 N·m) ±20% low as 20Vac in most indoor environments. Rated Voltage 300Vac Please note, when operated indoors in a 2-wire mode (i.e., TB1 and Display TB2 are connected to the same ac voltage), DMU-30ACV series’ input Display Type and Size Daylight readable, auto-dimming, current will increase as the input supply is decreased. At 20Vac, the 3½ digit, 0.56"/14.2mm high red LED input supply current will be approximately 30mA. Decimal Point Fixed, model dependent Overrange Indication "1___" Physical/Environmental Operating Temperature –25 – +60 °C Ordering Information Storage Temperature –40 – +75 °C Model Input Range Humidity (non-condensing) 0 – 85 % DMU-30ACV-0-DR-C 0 to 19.99Vac Dimensions See mechanical specifi cations DMU-30ACV-1-DR-C 0 to 199.9Vac Weight 1.3 ounces (36 grams) nominal DMU-30ACV-2-DR-C 0 to 300Vac See www.murata-ps.com/dpm-availability for model-specifi c availability. ➀ Specifi 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. ➁ 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. www.murata-ps.com/support MPM_DMU-30ACV.C02 Page 2 of 3

DMU-30ACV Series Ruggedized True-rms ac Voltmeters with Daylight Readable, Auto-Dimming LED Displays Mechanical Dimensions: Inches (mm) Tolerances: 2 PL DEC ±0.02 (±0.51) 3 PL DEC ±0.010 (±0.254) (722..8359) (318..51) M0.31 0IN (2S.E54R)T DEPTH 1.60 (40.64) CAL BRIGHTNESS ADJUST 1.97 (50.0) 0.26 1 2 1 2 (6.6) TB1 TB2 PWR VIN FRONT VIEW SUPPLY REAR VIEW SIGNAL INPUT INPUT RECOMMENDED DRILL AND PANEL CUTOUT 2.118 0.136 (3.45) DIA (53.8) (6 REQUIRED) Note: The supplied M3 screws and washers will accommodate 1.30 0.878 panel thicknesses from 0.060 to (33.02) PANEL CUTOUT (22.3) 0.090 inches (1.52 to 2.28 mm). INTERNAL CORNER RADII Tighten screws to 3.5–4.5 in-lbs 1.26 0.032 (0.81) MAX. (32.00) (0.4–0.5 Nm). 2.52 (64.00) PANEL INSTALLATION Step 1. Step 2. Step 3. Step 4. This product is subject to the following operating requirements Murata Power Solutions, Inc. and the Life and Safety Critical Application Sales Policy: 129 Flanders Road, Westborough, MA 01581 U.S.A. Refer to: http://www.murata-ps.com/requirements/ 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. Specifi cations are subject to change without notice. © 2018 Murata Power Solutions, Inc. www.murata-ps.com/support MPM_DMU-30ACV.C02 Page 3 of 3