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DMS-20RM-1-DC2-R-C Datasheet(PDF) 2 Page - Murata Power Solutions Inc. |
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DMS-20RM-1-DC2-R-C Datasheet(HTML) 2 Page - Murata Power Solutions Inc. |
2 / 4 page Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000 www.murata-ps.com DMS-20RM Series True-rms ac Voltmeters with Isolated Inputs MPM_DMS-20RM.A02 Page 2 of 4 IMPORTANT! To ensure safe and reliable operation, DMS-20RM ac voltmeters must be installed and serviced by qualified technical personnel. Contact Murata Power Solutions if there is any doubt regarding installation and/or operation. TECHNICAL NOTES 1. Measurement Type: DMS-20RM series ac voltmeters employ a preci- sion rms-to-dc converter and a high-precision voltage reference to measure and display the rms value of complex ac waveforms. Please note, the rear-mounted potential transformer is used to isolate the input signal being measured (TB2) from the ammeter’s operating power source connected to TB1. Do not pass any conductors through this transformer’s center hole as this will introduce significant measure- ment errors. 2. Wiring: All power supply and input signal wiring must be 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: As shown in Figures 1A and 1B, the two power supply inputs, TB1-A and TB1-B, on ac-pow- ered DMS-20RM voltmeters (“-AC1” suffix) are not polarity sensitive, that is, they have no “AC LO” or “AC HI” designations. Also, ac-powered models do not include or require a connection to earth/chassis ground. DC-powered models (‘-DC2’ suffix) are reverse-polarity protected, and must be connected as shown in Figure 2 for proper operation. DMS-20RM ac voltmeters are not internally fused. If fusing is required it must be externally installed according to the supply wire’s maximum amperage rating. 4. Calibration: Periodic recalibration of DMS-20RM voltmeters is not required under normal, indoor operating environments. If calibration is necessary, it should only be performed by qualified technical personnel. Calibration is performed with potentially lethal voltages applied to the DMS-20RM and its associated wiring. A plastic, fully-insulated adjust- ing tool must be used to access the recessed calibration potentiometer located on the back of the unit (see Mechanical Specifications). Contact Murata Power Solutions if additional information is required regarding calibration, setup, or any other technical issue pertaining to DMS-20RM ac voltmeters. ORDERING INFORMATION DMS-20RM-1-AC1-R-C 0 to 19.99Vac, AC Powered DMS-20RM-2-AC1-R-C 0 to 199.9Vac, AC Powered DMS-20RM-3-AC1-R-C 0 to 300Vac, AC Powered DMS-20RM-1-DC2-R-C 0 to 19.99Vac, DC Powered DMS-20RM-2-DC2-R-C 0 to 199.9Vac, DC Powered DMS-20RM-3-DC2-R-C 0 to 300Vac, DC Powered Performance/Functional Specifications Typical at TA=+ 25ºC with 60Hz sine-wave input, unless otherwise noted Full-Scale Input Voltage (TB2) Min. Typ. Max. Units DMS-20RM-1 DMS-20RM-2 DMS-20RM-3 0 0 0 — — — 19.99 199.9 300 Vac Vac Vac Frequency Range 47 60 1000 Hz Performance Sampling Rate 2.5 reading per second Accuracy ➀ ±0.4%FS ±2 counts with 60Hz sine wave input Measurement Type rms responding, Crest Factors of 1-5 Temperature Drift (0 to 60ºC) ±0.2 ±0.4 Counts/ºC Zero-Volt Reading (within 30 sec.) -001 000 001 Counts Breakdown Voltage, TB1 to TB2 2000 — — Vdc Power Supply Voltage (TB1) DMS-20RM-X-AC1 85 — 264 Vac/47-63Hz DMS-20RM-X-DC2 +10.0 — +40.0 Vdc Power Supply Current (TB1, ➁) DMS-20RM-X-AC1 — 30 50 mA/47-63Hz DMS-20RM-X-DC2 — 10 15 mAdc Terminal Block Wiring (TB1 and TB2) Wire Size 16-22AWG, Solid or stranded Insulation Strip Length 0.250 inches Screw Tightening Torque 3.6 pound-inches (0.4Nm) Rated Voltage 300Vac Display Display Type and Size 3½ Digit LED, 0.37”/9.4mm high Overrange Indication “1___” Decimal Point Fixed, model dependent (see full-scale input voltage above) Physical/Environmental Operating Temperature -25 — +60 ºC Storage Temperature -40 — +75 ºC Humidity (non-condensing) 0 — 85 % Dimensions Model dependent; see product datasheet. Weight: 1.3 Ounces (36 grams) nominal ➀ Specified accuracy applies to inputs with crest factors (CF) up to 2.0, where CF = Vpeak/Vrms. Crest factors of 2 to 5 introduce an additional error of ±3% of full scale. Voltmeters are calibrated with a near full-scale, 60Hz sine-wave input. ➁ Specified maximum power supply currents are steady state; larger surge currents can occur at initial application of power. |
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