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DMS-20PC-1AS Datasheet(PDF) 4 Page - List of Unclassifed Manufacturers |
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DMS-20PC-1AS Datasheet(HTML) 4 Page - List of Unclassifed Manufacturers |
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4 / 6 page  4 DMS-20PC 3 ½ DIGIT , LED DISPLA Y DIGIT AL P ANEL V O L TMETERS Figure 3. Differential Input Configuration Figure 6. Floating Input Measurements (Alternate Configuration) RShunt = R1 = VFsr /IFsr Where: VFsr = Full scale reading (in Volts) IFsr = Relative full scale current (in Amps) R2 R1 + R2 x VIN = Reading 50k Ω < R1 + R2 < 10MΩ Figure 4. Input Attenuation Circuit Figure 5. Floating Input Measurements Applications 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. 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-20PC 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: 4. Floating Signal Source Measurements: Floating signals can be measured using the circuits shown in Figures 5 and 6. Connecting pin 10 (ANALOG COMMON) or pin 3 (5V RETURN) 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. 2. Differential Input Configurations: Differential measurements can be made with all DMS-20PC meters. Figure 3, though not a practical real-world application, uses a voltage divider to demonstrate the concept of a differential input signal. Be careful not to exceed the ±2V common mode voltage limitation for 5V- powered meters. 1 12 3 +5V SUP (–) IN LO 5V RET DATEL UPA-5/500 120 VAC 11 (+) IN HI 6 AC to DC Converter DMS-20PC-1 R2 R1 R3 1k 1k 1k 8 7 REF IN DP1 REF OUT 2 DISPLAY ENABLE DMS-20PC-1 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 2 DISPLAY ENABLE 1 3 +5V SUP DATEL UPA-5/500 120 VAC 6 DP1 AC to DC Converter DMS-20PC-1 12 (–) IN LO 11 (+) IN HI 1.5V CELL – 8 7 REF OUT REF IN 2 DISPLAY ENABLE 5V RET DMS-20PC-1 12 (–) IN LO 10 ANA COMM 11 (+) IN HI 1.5V CELL – 8 7 REF OUT REF IN 1 3 +5V SUP DATEL UPA-5/500 120 VAC 6 DP1 AC to DC Converter 2 DISPLAY ENABLE 5V RET |
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Similar Description - DMS-20PC-1AS |
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