DMS-20PC-0-AS-C MURATA-PS [Murata Power Solutions Inc.], DMS-20PC-0-AS-C Datasheet - Page 4

• Manufacturer Part Number: DMS-20PC-0-AS-C
• Manufacturer: MURATA-PS [Murata Power Solutions Inc.]

APPLICATIONS
2. Differential Input Configurations: Differential measurements
3. Engineering Scaling: For measuring voltages greater than
85-264Vac
can be made with all DMS-20PC meters. Figure 3, though not
a practical real-world application, uses a voltage divider to
demonstrate the concept of a differential input signal. Be care-
ful not to exceed the ±2V common mode voltage limitation for
5V-powered meters.
85-264Vac
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-film resistors with absolute TCR's less than 50ppm/°C.
See Ap Note 4 for more information on engineering scaling.
+
–
AC to DC Converter
V
AC to DC Converter
REF OUT
REF IN
IN
50k < R1 + R2 < 10M
DMS-PS1-CM
DMS-PS1-CM
R1 + R2
Figure 3. Differential Input Configuration
DATEL
DATEL
R1
DP1
R2
R2
Figure 4. Input Attenuation Circuit
8
7
6
+5V SUP
(–) IN LO
(+) IN HI
x V
+5V SUP
1
11
12
IN
DMS-20PC-1
= Reading
1
2
DISPLAY
ENABLE
DMS-20PC-1
2
DISPLAY
ENABLE
5V RET
3
www.murata-ps.com
11
(+) IN HI
12
(–) IN LO
5V RET
3
7
8
REF OUT
REF IN
R1
R2
R3
1k
1k
1k
4. Floating Signal Source Measurements: Floating signals can be
3½ Digit, LED Display, Low-Cost, Subminiature
5. Process Control (4-to-20mA) Measurements: In many common
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 "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.
process-control applications, a 4-to-20mA current loop is used to
transmit information. Because DMS-20PC 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 require-
ments of the particular application and can be calculated using
the following equation:
Where:
85-264Vac
85-264Vac
CELL
CELL
1.5V
1.5V
R
Technical enquiries email: [e-mail], tel:
+
–
+
–
Shunt
V
AC to DC Converter
AC to DC Converter
I
Figure 6. Floating Input Measurements
Fsr
Fsr
Figure 5. Floating Input Measurements
DMS-PS1-CM
DMS-PS1-CM
= R1 = V
= Full scale reading (in Volts)
= Relative full scale current (in Amps)
DATEL
DATEL
ANA COMM
(Alternate Configuration)
(–) IN LO
(–) IN LO
(+) IN HI
(+) IN HI
+5V SUP
+5V SUP
DMS-20PC Series
11
10
12
12
Fsr
11
/ I
1
1
Fsr
Digital Panel Voltmeters
DMS-20PC-1
DMS-20PC-1
2
DISPLAY
ENABLE
2
DISPLAY
ENABLE
MPM_DMS_20PC.D02 Page 4 of 6
5V
RET
5V
RET
3
3
DP1
DP1
6
6
8
REF OUT
7
REF IN
7
8
REF OUT
REF IN
[phone]