DMS-20PC-0-RH Murata Power Solutions Inc, DMS-20PC-0-RH Datasheet - Page 4

• Manufacturer Part Number: DMS-20PC-0-RH
• Description: DATEL PANEL METERS
• Manufacturer: Murata Power Solutions Inc
• Type: Digital Panel Voltmetersr

Specifications of DMS-20PC-0-RH

• Rohs Compliant: NO
• Equipment Type: Digital Panel Voltmeters
• Input: +/- 200 V
• Display Type: 3 - 1/2 Digit LED
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

APPLICATIONS
2. Differential Input Confi gurations: Differential measurements
3. Engineering Scaling: For measuring voltages greater than
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
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-fi lm 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
50kΩ < R1 + R2 < 10MΩ
IN
R1 + R2
Figure 3. Differential Input Confi guration
R1
R2
DP1
R2
Figure 4. Input Attenuation Circuit
+5V SUP
8
7
6
(–) IN LO
(+) IN HI
x V
+5V SUP
1
11
12
IN
DMS-20PC-1
= Reading
1
2
DISPLAY
ENABLE
DMS-20PC-1
DISPLAY
2
ENABLE
5V RET
3
11
(+) IN HI
12
(–) IN LO
5V RET
3
7
8
REF OUT
REF IN
www.murata-ps.com/dpm
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 "fl oating" input is a signal that has no galvanic connection to
the meter's power supply. In the fi gures below, the 1.5V battery
illustrates a true fl oating 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
Shunt
V
+
+
–
–
I
AC to DC Converter
AC to DC Converter
Figure 6. Floating Input Measurements
Fsr
Fsr
Figure 5. Floating Input Measurements
= R1 = V
= Full scale reading (in Volts)
= Relative full scale current (in Amps)
ANA COMM
(Alternate Confi guration)
(–) IN LO
(–) IN LO
(+) IN HI
(+) IN HI
+5V SUP
+5V SUP
DMS-20PC Series
15 Feb 2010 MPM_DMS_20PC.D06 Page 4 of 6
Fsr
11
10
12
11
12
/ I
1
1
Fsr
Digital Panel Voltmeters
DMS-20PC-1
DMS-20PC-1
2
DISPLAY
ENABLE
2
DISPLAY
ENABLE
email: [e-mail]
5V
RET
5V
RET
3
3
DP1
DP1
6
6
8
REF OUT
7
REF IN
8
REF OUT
7
REF IN