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| www.murata-ps.com DMU-30ACV Series Ruggedized True-rms ac Voltmeters with Daylight Readable, Auto-Dimming LED Displays 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 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. 1. Measurement Type: DMU-30ACV series ac voltmeters employ a precision rms-to-dc converter 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. TB2 + - CAL BRIGHTNESS ADJUST 1 TB1 2 1 2 REAR VIEW 85-264Vac Power Source Input Signal 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 externally installed according to the supply wire's maximum amperage rating. Figure 1. DMU-30ACV wiring diagram For full details go to www.murata-ps.com/rohs www.murata-ps.com Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000 MPM_DMU-30ACV_B05 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 3/4-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 midpoint 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. Performance/Functional Specifications Typical at TA = +25C, 60Hz sine-wave input, unless otherwise noted. Input (TB2) Full Scale Input Range: DMU-30ACV-0 DMU-30ACV-1 DMU-30ACV-2 Input-Voltage Frequency Range Performance Sampling Rate Accuracy Measurement Type Zero Reading (within 30 sec.) Temperature Drift (0 to +60C) Breakdown Voltage (TB1 to TB2) Supply Voltage (TB1) DMU-30ACV Supply Current (TB1) DMU-30ACV (total darkness) DMU-30ACV (full sunlight) Terminal Block Wiring (TB1 & TB2) Wire Size Insulation Strip Length Screw Tightening Torque Rated Voltage Display Display Type and Size Decimal Point Overrange Indication Physical/Environmental Operating Temperature -25 -40 0 - - - +60 +75 85 C C % Daylight readable, auto-dimming, 31/2 digit, 0.56"/14.2mm high red LED Fixed, model dependent "1_ _ _ " 16-22 AWG, Solid or stranded 0.250 inches (6.35) 3.6 pound-inches (0.4Nm) 300Vac - - 4 40 6 50 mA/4763Hz mA/4763Hz 85 - 264 Vac/4763Hz 2.5 readings per second 0.4%FS 2 counts w/ 60Hz sine-wave input RMS responding, Crest Factors of 1-5 "-002" - 2000 "000" 0.2 - "002" 0.4 - Cnts Cnts/C Vdc 0 0 0 47 - - - 60 19.99 199.9 300 1000 Vac Vac Vac Hz Min. Typ. Max. Units Ordering Information Model DMU-30ACV-0-DR-C DMU-30ACV-1-DR-C DMU-30ACV-2-DR-C Input Range 0 to 19.99Vac 0 to 199.9Vac 0 to 300Vac Storage Temperature Humidity (non-condensing) Dimensions Weight See mechanical specifications 1.3 ounces (36 grams) nominal 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. 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. www.murata-ps.com Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000 MPM_DMU-30ACV_B05 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) 2.85 (72.39) 1.5 (38.1) M3 INSERT 0.10 (2.54) DEPTH 1.60 (40.64) CAL BRIGHTNESS ADJUST 1.97 (50.0) 0.26 (6.6) 1 TB1 2 1 2 TB2 FRONT VIEW PWR SUPPLY INPUT REAR VIEW + VIN - SIGNAL INPUT RECOMMENDED DRILL AND PANEL CUTOUT 2.118 (53.8) 0.136 (3.45) DIA (6 REQUIRED) Note: The supplied screws and washers will accommodate panel thicknesses from 0.060 to 0.090 inches (1.52 to 2.28 mm). 1.30 (33.02) PANEL CUTOUT 0.878 (22.3) 1.26 (32.00) 2.52 (64.00) INTERNAL CORNER RADII 0.032 (0.81) MAX. PANEL INSTALLATION Step 1. Step 2. Step 3. Step 4. USA: Canada: UK: France: Germany: Japan: China: Singapore: Mansfield (MA), Tel: (508) 339-3000, email: sales@murata-ps.com Toronto, Tel: (866) 740-1232, email: toronto@murata-ps.com Milton Keynes, Tel: +44 (0)1908 615232, email: mk@murata-ps.com Montigny Le Bretonneux, Tel: +33 (0)1 34 60 01 01, email: france@murata-ps.com Munchen, Tel: +49 (0)89-544334-0, email: munich@murata-ps.com Tokyo, Tel: 3-3779-1031, email: sales_tokyo@murata-ps.com Osaka, Tel: 6-6354-2025, email: sales_osaka@murata-ps.com Shanghai, Tel: +86 215 027 3678, email: shanghai@murata-ps.com Guangzhou, Tel: +86 208 221 8066, email: guangzhou@murata-ps.com Parkway Centre, Tel: +65 6348 9096, email: singapore@murata-ps.com Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000 Murata Power Solutions, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A. Tel: (508) 339-3000 (800) 233-2765 Fax: (508) 339-6356 www.murata-ps.com email: sales@murata-ps.com ISO 9001 and 14001 REGISTERED 03/18/09 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. (c) 2009 Murata Power Solutions, Inc. www.murata-ps.com MPM_DMU-30ACV_B05 Page 3 of 3 |
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