DMS-30PC(2015) 데이터 시트보기 (PDF) - Murata Power Solutions
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DMS-30PC
(Rev.:2015)
(Rev.:2015)
Murata Power Solutions
DMS-30PC Datasheet PDF : 6 Pages
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APPLICATIONS
2. Differential Input Configurations: Differential measurements can
be made with all DMS-30PC meters. Figure 3, though not a practi-
cal 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.
REF OUT 8
REF IN 7
DP1 6
DMS-30PC-1
1
+5V SUP
R1
11
1k
(+) IN HI
R2
12
1k
(–) IN LO
R3
3
1k
5V RET
85-264Vac
AC to DC Converter
Figure 3. Differential Input Configuration
3. Engineering Scaling: For measuring voltages greater than the full
scale input range of a given meter, the input signal must be attenu-
ated. 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-film resistors with absolute TCR's
less than 50ppm/°C. See Ap Note 4 for more information on engineer-
ing scaling.
50kΩ < R1 + R2 < 10MΩ
R2
x VIN = Reading
R1 + R2
R1
VIN
11
(+) IN HI
R2
12
(–) IN LO
–
DMS-30PC-1
1
+5V SUP
3
5V RET
8
REF OUT
7
REF IN
85-264Vac
AC to DC Converter
Figure 4. Input Attenuation Circuit
4. Floating Signal Source Measurements: Floating signals can be
measured using the circuits shown in Figures 5 and 6. Connecting pin
DMS-30PC Series
3½ Digit, LED Display Low-Power,
Miniature Digital Panel Voltmeters
10 (ANALOG COMMON) or pin 3 (5V RETURN) to (–) INPUT LO (pin 12)
provides the reference point for the meter's input.
A "floating" input is a signal that has no galvanic connection to the
meter's power supply. In the figures below, the 1.5V battery illustrates
a true floating input.
1.5V
CELL
–
11
(+) IN HI
DMS-30PC-1
12
(–) IN LO
1
3
6
+5V SUP
5V RET
DP1
8
REF OUT
7
REF IN
85-264Vac
AC to DC Converter
Figure 5. Floating Input Measurements
1.5V
CELL
–
11
(+) IN HI
10
ANA COMM
12
(–) IN LO
1
+5V SUP
DMS-30PC-1
8
REF OUT
3
5V RET
6
DP1
7
REF IN
85-264Vac
AC to DC Converter
Figure 6. Floating Input Measurements
(Alternate Configuration)
5. Process Control (4-to-20mA) Measurements: In many common
process-control applications, a 4-to-20mA current loop is used to
transmit information. Because DMS-30PC meters have such high
input impedance, 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 shunt resistor is a function of the scaling requirements of
the particular application and can be calculated using the following
equation:
RShunt = R1 = VFsr / IFsr
Where: VFsr = Full scale reading (in Volts)
IFsr = Relative full scale current (in Amps)
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MPM_DMS_30PC.G01 Page 4 of 6
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