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DMS-20PC-0OS Datasheet(PDF) 5 Page - List of Unclassifed Manufacturers |
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DMS-20PC-0OS Datasheet(HTML) 5 Page - List of Unclassifed Manufacturers |
5 / 6 page 5 Applications 3 ½ DIGIT , LED DISPLA Y DIGIT AL P ANEL V O L TMETERS DMS-20PC Figure 8. 4.5V-18V Power Supply Monitor Figure 10. External Gain Adjustment 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. Figure 9. DC Ammeter Circuit The LM-2931 was chosen because it has the following on-chip protection features: reverse polarity, short circuit and thermal runaway. When using other, higher-power, DMS-20PC 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 circuit shown in Figure 10 for applications needing external gain adjustment. Calibration is performed with a precise, near-full-scale, input voltage. 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-20PC-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. 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 13 +5V SUP 5V RET DATEL UPA-5/500 120 VAC AC to DC Converter DMS-20PC-1 12 (–) IN LO 10 ANA COMM 11 (+) IN HI R1 – 4-20mA 50k R2 8 7 REF OUT REF IN 2 DISPLAY ENABLE 5 7 8 + – DMS-20PC-2-RL 12 11 1 4.5 - 18Vdc LM2931Z-5 GND IN OUT +5V SUP 3 DP2 REF IN REF OUT (–) IN LO 5V RET 2 DISP EN (+) IN HI 22µF 10V + 6 3 + – DMS-20PC-0 11 0.150V 1 1.5 Amp (Load Current) 5Vdc 7 8 +5V SUP 5V RET DP1 (+) IN HI REF OUT REF IN 2 DISP EN 0.1 W RShunt Load (3.3 ) 12 (–) IN LO W 12 VOLTAGE CALIBRATOR OUT 10 (+) IN HI (–) IN LO ANA COMM = 10 to 20 Turns 7 REF IN 11 732, 1% 8.06k, 1% 5V RET Connections for ±2V, ±20V and ±200V models Connections for ±200mV models COM 17.4k, 1% 2k 24.3k, 1% 3 12 DMS-20PC-1 8 NC 200 +5V IN 1 1 1 1 |
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