DMS-20PC-1-RL-C DATEL, DMS-20PC-1-RL-C Datasheet - Page 4

• Manufacturer Part Number: DMS-20PC-1-RL-C
• Description: Digital Panel Voltmeter
• Manufacturer: DATEL

Specifications of DMS-20PC-1-RL-C

• No. Of Digits / Alpha: 3.5
• Meter Function: DC Voltmeter
• Meter Range: ± 0V To ± 2V
• Digit Height: 9.4mm
• Operating Temperature Range: 0°C To +60°C
• Length/height, External: 20mm
• Accuracy: ± 1 Count
• Body Material: Polycarbonate
• Sample Rate: 2.5 Samples/sec
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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APPLICATIONS
DMS-20PC Series
2. Differential Input Configurations: Differential measurements
3. Engineering Scaling: For measuring voltages greater than the
can be made with all DMS-20PC meters. Figure 3, though not a
practical real-world application, uses a voltage divider to demon-
strate the concept of a differential input signal. Be careful not to
exceed the ±2V common mode voltage limitation for 5V-powered
meters.
85-264Vac
85-264Vac
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 resis-
tors 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
DMS-PS1-CM
50kΩ < R1 + R2 < 10MΩ
DMS-PS1-CM
Figure 3. Differential Input Configuration
R1 + R2
DATEL
DATEL
R1
DP1
R2
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
2
DISPLAY
ENABLE
5V RET
3
11
(+) IN HI
12
(–) IN LO
5V RET
3
8
REF OUT
7
REF IN
3 ½ D I G I T , L E D D I S P L A Y D I G I T A L P A N E L V O L T M E T E R S
3 ½ D I G I T , L E D D I S P L A Y D I G I T A L P A N E L V O L T M E T E R S
R1
R2
R3
1k
1k
1k
4. Floating Signal Source Measurements: Floating signals can be
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 illus-
trates 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
+
–
+
–
Shunt
V
AC to DC Converter
Figure 6. Floating Input Measurements
I
AC to DC Converter
Figure 5. Floating Input Measurements
Fsr
Fsr
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
D I G I T A L P A N E L M E T E R S
+5V SUP
+5V SUP
11
10
12
11
12
Fsr
/ I
1
1
Fsr
DMS-20PC-1
DMS-20PC-1
2
DISPLAY
ENABLE
2
DISPLAY
ENABLE
MPM_DMS-20PC_C00
5V
RET
3
5V
RET
3
DP1
DP1
6
6
8
REF OUT
7
REF IN
8
REF OUT
7
REF IN
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