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DMS-20LCD-1-9-C Datasheet(PDF) 5 Page - Murata Power Solutions Inc. |
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DMS-20LCD-1-9-C Datasheet(HTML) 5 Page - Murata Power Solutions Inc. |
5 / 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 5 of 6 APPLICATIONS To calibrate the circuit of Figure 7, perform the following: 1. With 4mA applied, adjust the 50k 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 "1999". For different full scale readings, alter the value of RShunt accordingly. RShunt = R1 = VFsr /IFsr Where: VFsr = Full scale reading (in Volts) IFsr = Relative full scale current (in Amps) Example: For a meter with a 2V full scale input (1.999 full scale reading) and a desired full scale 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 Figure 7. 4-to-20mA Current Loop Operation (5V-Powered Models) R2 (R1 + R2 + R3) = 0.1 6. Power Supply Monitoring: A popular application for DATEL’s low- power LCD meters is monitoring the supply voltage in battery-oper- ated portable equipment. Figure 8 demonstrates how a 9V-powered DMS-20LCD can be used to monitor its own supply. The meter used is the DMS-20LCD-1-9. A three-resistor voltage divider is used to attenuate the battery voltage and also to satisfy the requirement that the input voltages applied to pins 12 and 11 be at least 1.5 Volts above and below the battery voltage applied to pins 1 (+BATTERY) and 3 (–BATTERY). The divider should be designed so that 1/10th the bat- tery voltage falls across the inputs to the meter: Therefore, the 9V battery voltage appears to the meter inputs as 0.9V. With the decimal point moved to its DP2 position (pin 5 tied to pin 3), the meter reads 9.00 Volts. The circuit can be calibrated by first measuring the actual battery volt- age with another meter and then adjusting the gain-adjust potentiom- eter on the back of the DMS-20LCD until a similar reading is obtained. If possible, the resistors in the divider should be ±1% metal-film types with TCR’s less than 50ppm/°C. 7. External Gain Adjustment: Connect REFERENCE OUT (pin 8) to REFERENCE IN (pin 7) for normal, factory calibrated, operation. Use the circuit shown in Figure 9 for applications needing external gain adjustment. Calibration is performed with a precise, near-full-scale, input voltage. Figure 9. External Gain Adjustment Figure 8. Power Supply Monitor (9V-Powered Models) 13 +5V SUP 5V RET DATEL UPA-5/500 120 VAC AC to DC Converter 12 (–) IN LO 10 ANA COMM 11 (+) IN HI R1 – 4-20mA 50k R2 8 7 REF OUT REF IN DMS-20LCD-1-5 1 12 3 +BAT (–) IN LO –BAT 11 (+) IN HI 5 DP2 DMS-20LCD-1-9 R2 R1 R3 45.3k 10.1k 45.3k 9V BATTERY – 8 7 REF OUT REF IN 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/ –BAT IN Connections for ±2V, ±20V and ±200V models Connections for ±200mV models COM 1 +5V IN/ +BAT IN 17.4k, 1% 2k 24.3k, 1% 3 12 DMS-20LCD For +5V models, tie (–) IN LO to pin 3. For +9V models, tie (–) IN LO to pin 10 8 NC 200 |
Similar Part No. - DMS-20LCD-1-9-C |
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Similar Description - DMS-20LCD-1-9-C |
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