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DMS-30PC-2-RL Datasheet(PDF) 5 Page - List of Unclassifed Manufacturers |
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DMS-30PC-2-RL Datasheet(HTML) 5 Page - List of Unclassifed Manufacturers |
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5 / 6 page  5 3 ½ DIGIT , LED DISPLA Y DIGIT AL P ANEL V O L TMETERS DMS-30PC Figure 10. External Gain Adjustment Figure 8. 4.5-18V Power Supply Monitor Figure 9. Basic DC Ammeter Circuit Figure 7. 4-to-20mA Current Loop Operation To calibrate the circuit of Figure 7, perform the following: 1. With 4mA applied, adjust the 50k Ω potentiometer (R2) to display a reading of "000" (assuming that is the desired reading). 2. With 20mA applied, adjust the gain-adjust potentiometer on the back of the meter to display a reading of "1000". For different full scale readings, alter the value of RShunt accordingly. Example: For a meter with a 2V full scale input (1.999 full scale reading) and a desired display reading of "1000" (with an input of 20mA), VFsr = 1.000 Volts RShunt = 1.000V/(0.020 – 0.004)A RShunt = 1.000V/0.016A = 62.5 Ohms 6. Power Supply Monitoring: One of the most common digital panel meter applications involves monitoring the output voltage of the system power supply — often this supply also powers the meter itself. The low-power, red LED DMS-30PC-2-RL can be configured to allow power supply monitoring over the range of 4.5-18Vdc. The circuit in Figure 8 uses a low-drop-out, three- terminal regulator (LM-2931Z-5, available from National Semiconductor) to provide regulated 5V power to the meter. The LM-2931 was chosen because it has the following on-chip protection features: reverse polarity, short circuit and thermal run- away. When using other, higher-power, DMS-30PC models with three-terminal regulators, be sure to consult the regulator manufacturer's data sheet to ensure the regulator is being utilized safely and correctly. 7. Digital Ammeter: Digital ammeters are finding ever-increasing usage because analog-style ammeters (moving-vane types) now cost roughly the same as their digital counterparts. Additionally, analog ammeters are not nearly as rugged as modern digital panel voltmeters. Figure 9 illustrates a typical ammeter application. The circuit uses a ±200mV input meter — the preferred range for most ammeters — to measure the voltage developed across a 0.1 Ω current shunt. The circuit shown represents a basic ammeter connection diagram. A detailed application note describing digital dc ammeters is included in DATEL's new Digital Panel Meter Databook. 8. External Gain Adjustment: Connect REFERENCE OUT (pin 8) to REFERENCE IN (pin 7) for normal, factory calibrated, operation. Use the +1.23V REFERENCE OUT (pin 9) for applications needing external gain adjustment. Figure 10 shows the wiring configuration for each model. Calibration is performed with a precise, near-full-scale, input voltage. Applications 1 3 5V RET DATEL UPA-5/500 120 VAC AC to DC Converter DMS-30PC-1 12 (–) IN LO 10 ANA COMM 11 (+) IN HI R1 – 4-20mA 50k R2 8 7 REF OUT REF IN 9 1.23V REF 5V SUP DMS-30PC-2-RL 5 7 12 + – 11 1 4.5 - 18Vdc LM2931Z-5 GND IN OUT +5V SUP 3 5V RET DP2 REF IN (+) IN HI 8 REF OUT (–) IN LO 22µF 10V + DMS-30PC-0-YS 6 3 + – 1 1.5 Amp (Load Current) 5Vdc 7 8 +5V SUP 5V RET DP1 REF OUT REF IN 11 0.150V (+) IN HI 0.1 Ω RShunt Load (3.3 ) 12 (–) IN LO Ω 9 (+) IN HI (–) IN LO ANA COMM 10 1.23V REF 1k 10 to 20 Turns 8 REF IN 11 1k 10 to 20 Turns 8.45k, 1% 8.45k, 1% 5V RET Connections for ±2V, ±20V and ±200V models Connections for ±200mV models 7 NC 12 3 DMS-30PC 12 VOLTAGE CALIBRATOR OUT COM |
Similar Part No. - DMS-30PC-2-RL |
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Similar Description - DMS-30PC-2-RL |
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