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DMS-20LCD-3-5B-C Datasheet(PDF) 4 Page - Murata Power Solutions Inc. |
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DMS-20LCD-3-5B-C Datasheet(HTML) 4 Page - Murata Power Solutions Inc. |
4 / 6 page DMS-20LCD Series 3½ Digit, LCD Display Digital Panel Voltmeters Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000 www.murata-ps.com MPM_DMS20lcd.B03 Page 4 of 6 APPLICATIONS R2 R1 + R2 x VIN = Reading 50k < R1 + R2 < 10M 4. Floating Signal Source Measurements: Floating signals can be measured using the circuits shown in Figures 5 and 6. Figure 5 uses a 5V-powered meter. Figure 6 uses a 9V-powered meter. Connecting pin 10 (ANALOG COMMON) to (–) INPUT LO (pin 12) provides the reference point for the meter’s input. A “floating” input is a signal that has no galvanic connection to the meter’s power supply. In the figures below, the 1.5V battery illustrates a true floating input. Figure 3. Differential Input Configuration (5V-Powered Models) 5. Process Control (4-to-20mA) Measurements: In many common process-control applications, a 4-to-20mA current loop is used to transmit information. Because DMS-20LCD meters have such high input impedance, a simple shunt resistor across the meter’s input can be used to convert the loop current to a voltage. See Figure 7. The value of the shunt resistor is a function of the scaling requirements of the particular application and can be calculated using the following equation: Figure 6. Floating Input Measurements (9V-Powered Models) Figure 5. Floating Input Measurements (5V-Powered Models) Figure 4. Input Attenuation Circuit 2. Differential Input Configurations: Differential measurements can be made with either 5V-powered or 9V-powered meters. Figure 3, though not a practical real-world application, uses a voltage divider to demon- strate the concept of a differential input signal. Be careful not to exceed the ±2V common mode voltage limitation for 5V powered meters. 3. Engineering Scaling: For measuring voltages greater than the full scale input range of a given meter, the input signal must be attenuated. A simple voltage divider (similar to that shown in Figure 4) will scale the input to within the range of the selected meter. R1 and R2 should be precision, ±1%, metal-film resistors with absolute TCR’s less than 50ppm/°C. See Ap Note 4 for more information on engineering scaling. 1 12 3 +5V SUP (–) IN LO 5V RET DATEL UPA-5/500 120 VAC 11 (+) IN HI 6 AC to DC Converter R2 R1 R3 1k 1k 1k 8 7 REF IN DP1 REF OUT DMS-20LCD-1-5 R2 11 12 (+) IN HI (–) IN LO VIN R1 – 1 3 +5V SUP 5V RET DATEL UPA-5/500 120 VAC AC to DC Converter 8 7 REF OUT REF IN DMS-20LCD-1-5 13 +5V SUP 5V RET DATEL UPA-5/500 120 VAC 6 DP1 AC to DC Converter 12 (–) IN LO 11 (+) IN HI 1.5V CELL – 8 7 REF OUT REF IN DMS-20LCD-1-5 1 3 + BAT –BAT 9V BATTERY 6 DP1 12 (–) IN LO 10 ANA COMM 11 (+) IN HI 1.5V CELL – – 8 7 REF OUT REF IN DMS-20LCD-1-5 DMS-20LCD-1-9 |
Similar Part No. - DMS-20LCD-3-5B-C |
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