MPM_DMS30-lcd.D02.indd JParks

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Specifications	MPM_DMS30-lcd.D02.indd JParks
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DMS-30LCD Series 3½ Digit, LCD Display Digital Panel Voltmeters www.murata-ps.com/dpmemail: sales@murata-ps.com 06 Jan 2

Specifications	MPM_DMS30-lcd.D02.indd JParks
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Content	DMS-30LCD Series 3½ Digit, LCD Display Digital Panel Voltmeters www.murata-ps.com/dpmemail: sales@murata-ps.com 06 Jan 2011 MPM_DMS30LCD.D02 Page 5 of 6 APPLICATIONS R2 (R1 + R2 + R3) = 0.1 Figure 7. 4-to-20mA Current Loop Operation (5V-Powered Models) Figure 9. External Gain Adjustment Figure 8. Power Supply Monitor (9V-Powered Models) 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-30LCD can be used to monitor its own supply. The meter used is the DMS-30LCD-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: To calibrate the circuit of Figure 7, perform the following: 1. With 4mA applied, adjust the 50kΩ 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 RShunt value 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 7. External Gain Adjustment: Connect REFERENCE OUT (pin 8) to REFERENCE IN (pin 7) for normal, factory calibrated, opera- tion. Use the +1.23V REFERENCE OUT (pin 9) for applications need- ing external gain adjustment. Figure 9 shows the wiring conﬁ guration for each model. Calibration is performed with a precise, near-full-scale, input voltage. 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 ﬁ rst measuring the actual battery volt- age with another meter and then adjusting the gain-adjust potentiom- eter on the back of the DMS-30LCD until a similar reading is obtained. If possible, the resistors in the divider should be ±1% metal-ﬁ lm types with TCR’s less than 50ppm/°C. 1 12 3 +BAT (–) IN LO –BAT 11 (+) IN HI 5 DP2 R2 R1 R3 45.3k 10.1k 45.3k 9V BATTERY + – 8 7 REF OUT REF IN DMS-30LCD-1-9 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 7 NC 12 3 For 5V models tie (–) IN LO to pin 3 For 9V models tie (–) IN LO to pin 10 12VOLTAGE CALIBRATOR OUT COM Connections for ±2V and ±20V models Connections for ±200mV models DMS-30LCD 31 +5V SUP5V RET 120 VAC AC to DC Converter (–) IN LO ANA COMM (+) IN HI R1 + – 4-20mA 50k R2 8 7 REF OUT REF IN DMS-30LCD-1-5
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Following Datasheets	30lcd420 (6 pages) 30N (1 pages) 30pc (6 pages) 30pc_420 (4 pages) 30x (1 pages) 31-1_3 (1 pages) 31-2 (1 pages) 31_4 (2 pages) 310701 (1 pages) 310801 (1 pages)
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