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DMS-30DR Series
Sunlight Readable, 3? Digit Panel Meters
APPLICATIONS
2. Differential Input Con?gurations: Differential measurements can be
made with all DMS-30DR meters. Figure 3, though not a practical real-
world application, uses a voltage divider to demonstrate the concept
of a differential input signal. Be careful not to exceed the ±2V common
mode voltage limitation for 5V-powered meters.
with Auto-Dimming LED Displays
4. Floating Signal Source Measurements: Floating signals can be
measured using the circuits shown in Figures 5 and 6. Connecting pin
10 (ANALOG COMMON) or pin 3 (5V RETURN) to (–) INPUT LO (pin
12) provides the reference point for the meter's input.
A "?oating" input is a signal that has no galvanic connection to the
meter's power supply. In the ?gures below, the 1.5V battery illustrates a
REF OUT 8
DMS-30DR-1
11
(+) IN HI
R1
1k
true ?oating input.
REF IN 7
12
R2
1k
11
(+) IN HI
DMS-30DR-1
8
REF OUT
DP1 6
(–) IN LO
1.5V
1
+5V SUP
3
5V RET
R3
1k
CELL
–
12
(–) IN LO
7
REF IN
85-264Vac
AC to DC Converter
Figure 3. Differential Input Con?guration
85-264Vac
AC to DC Converter
1
+5V SUP
3
5V RET
6
DP1
Figure 5. Floating Input Measurements
3. Engineering Scaling: For measuring voltages greater than the full
scale input range of a given meter, the input signal must be attenuated.
A simple voltage divider (similar to that shown in Figure 4) will scale
the input to within the range of the selected meter. R1 and R2 should
be precision, ±1%, metal-?lm resistors with absolute TCR's less than
1.5V
11
(+) IN HI
10
ANA COMM
DMS-30DR-1
8
REF OUT
50ppm/°C. See Ap Note 4 for more information on engineering scaling.
CELL
–
12
7
(–) IN LO
REF IN
50k Ω < R1 + R2 < 10M Ω
R2
x V IN = Reading
R1 + R2
85-264Vac
1
+5V SUP
3
5V RET
6
DP1
AC to DC Converter
R1
11
DMS-30DR-1
V IN
(+) IN HI
8
REF OUT
Figure 6. Floating Input Measurements
(Alternate Con?guration)
–
R2
12
(–) IN LO
1
+5V SUP
3
5V RET
7
REF IN
5. Process Control (4-to-20mA) Measurements: In many common pro-
cess-control applications, a 4-to-20mA current loop is used to transmit
information. Because DMS-30DR meters have such high input imped-
ance, a simple shunt resistor across the meter's input can be used to
convert the loop current to a voltage. See Figure 7. The value of the
85-264Vac
shunt resistor is a function of the scaling requirements of the particular
application and can be calculated using the following equation:
Figure 4. Input Attenuation Circuit
Where:
R Shunt = R1 = V Fsr / I Fsr
V Fsr = Full scale reading (in Volts)
I Fsr = Relative full scale current (in Amps)
www.murata-ps.com/dpm
03 Aug 2010
email: sales@murata-ps.com
MPM_DMS-30DR.B05 Page 4 of 6
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