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DMS-20LCD Series
3? Digit, LCD Display Digital Panel Voltmeters
APPLICATIONS
R Shunt = R1 = V Fsr / I Fsr
Therefore, the 9V battery voltage appears to the meter inputs as 0.9V.
With the decimal point moved to its DP2 position
Where:
V Fsr = Full scale reading (in Volts)
I Fsr = Relative full scale current (in Amps)
(pin 5 tied to pin 3), the meter reads 9.00 Volts.
The circuit can be calibrated by ?rst measuring the actual battery volt-
age with another meter and then adjusting the gain-adjust potentiom-
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), V Fsr = 1.000 Volts
R Shunt = 1.000V/(0.020 – 0.004)A
R Shunt = 1.000V/0.016A = 62.5 Ohms
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-?lm types
with TCR’s less than 50ppm/°C.
DMS-20LCD-1-9
To calibrate the circuit of Figure 7, perform the following:
1. With 4mA applied, adjust the 50k : potentiometer (R2) to
REF OUT 8
11
(+) IN HI
12
(–) IN LO
R1
45.3k
R2
10.1k
display a reading of "000" (assuming that is the desired
reading).
REF IN 7
1
+BAT
3
–BAT
5
DP2
R3
45.3k
2. With 20mA applied, adjust the gain-adjust potentiometer on
9V
the back of the meter to display a reading of "1999". For different full
BATTERY
–
scale readings, alter the value of R Shunt accordingly.
Figure 8. Power Supply Monitor
(9V-Powered Models)
11
(+) IN HI
10
ANA COMM
DMS-20LCD-1-5
8
REF OUT
7. External Gain Adjustment: Connect REFERENCE OUT
(pin 8) to REFERENCE IN (pin 7) for normal, factory calibrated,
4-20mA
R1
12
(–) IN LO
R2
1
+5V SUP
3
5V RET
7
REF IN
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.
–
50k
11
(+) IN HI
DMS-20LCD
120 VAC
OUT
3
AC to DC Converter
12
VOLTAGE
CALIBRATOR
5V RET/
–BAT IN
1
+5V IN/
Figure 7. 4-to-20mA Current Loop Operation
(5V-Powered Models)
COM
12
(–) IN LO
10
8
7
+BAT IN
Connections
for ±2V, ±20V
and ±200V models
ANA
NC
REF
6. Power Supply Monitoring: A popular application for DATEL’s low-
COMM
8.06k, 1%
IN
2k
c
17.4k, 1%
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
For +5V models, tie (–) IN LO to pin 3.
For +9V models, tie (–) IN LO to pin 10
Connections
for ±200mV
is the DMS-20LCD-1-9. A three-resistor voltage divider is used to
732, 1%
200
c
24.3k, 1%
models
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
c
= 10 to 20 Turns
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:
Figure 9. External Gain Adjustment
R2
(R1 + R2 + R3)
= 0.1
www.murata-ps.com/dpm
05 Apr 2011
email: sales@murata-ps.com
MPM_DMS20LCD.B08 Page 5 of 6
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