dmu-30acv series ruggedized true-rms ac voltmeters with daylight readable, auto-dimming led displays for full details go to www.murata-ps.com/rohs www.murata-ps.com/dpm www.murata-ps.com email: sales@murata-ps.com tb1 tb2 cal brightness adjust rear view fused 85-264vac power source input signal +C 1 2 1 2 figure 1. dmu-30acv wiring diagram 24 mar 2011 mpm_dmu-30acv.b07 page 1 of 3 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 units 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 rear- mounted terminal blocks and the unit is fully operational. 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 technical notes 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 speci? cations). 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 users speci? 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/ chassis 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- tions to dmu-30acv 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 users speci? c installation. dmu-30acv voltmeters are not internally fused. terminal block tb1 is to be used only for powering the power meters 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 termi nal. important! to ensure safe and reliable operation, dmu-30acv ac voltmeters must be installed and serviced by quali? ed technical personnel. contact murata power solutions / datel if there is any doubt regarding installation and/or operation. $
dmu-30acv series ruggedized true-rms ac voltmeters with daylight readable, auto-dimming led displays www.murata-ps.com/dpm email: sales@murata-ps.com 24 mar 2011 mpm_dmu-30acv.b07 page 2 of 3 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 veri? ed on a yearly basis. if recalibration is necessary, it should only be performed by quali? ed 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 mechani- cal speci? cations). 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-30acvs minimum led display brightness to suit their indoor viewing requirements by adjusting the ?-turn, rear-mounted intensity adjustment potentiometer. please note, this potentiometer will have minimal impact on display brightness in high ambient light environ- ments. 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 displays intensity. see the mechanical speci? ca- tions 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 speci? ed 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 speci? cations typical at t a = +25c, 60hz sine-wave input, unless otherwise noted. ? speci? 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. ? display reading is set to 1888. speci? 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-30acv-0 0 C 19.99 vac dmu-30acv-1 0 C 199.9 vac dmu-30acv-2 0 C 300 vac input-voltage frequency range 47 60 1000 hz performance sampling rate 2.5 readings per second accuracy ? 0.4%fs 2 counts w/ 60hz sine-wave input measurement type rms responding, crest factors of 1-5 zero reading (within 30 sec.) C002 000 002 cnts temperature drift (0 to +60c) C 0.2 0.4 cnts/c breakdown voltage (tb1 to tb2) 2000 C C vdc supply voltage (tb1) dmu-30acv 85 C 264 vac/47- 63hz supply current (tb1) ? dmu-30acv (total darkness) C 4 6 ma/47- 63hz dmu-30acv (full sunlight) C 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, 3? digit, 0.56"/14.2mm high red led decimal point fixed, model dependent overrange indication "1___" physical/environmental operating temperature C25 C +60 c storage temperature C40 C +75 c humidity (non-condensing) 0 C 85 % dimensions see mechanical speci? cations weight 1.3 ounces (36 grams) nominal 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
dmu-30acv series ruggedized true-rms ac voltmeters with daylight readable, auto-dimming led displays 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 her ein do not imply the granting of licenses to make, use, or sell equipment constructed in accordance therewith. speci? cations are subject to cha nge without notice. ? 2011 murata power solutions, inc. www.murata-ps.com/locations email: sales@murata-ps.com murata power solutions, inc. 11 cabot boulevard, mans? 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 C 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). panel installation 24 mar 2011 mpm_dmu-30acv.b07 page 3 of 3
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