DMS-40LCD-1/2-9-C Murata Power Solutions Inc, DMS-40LCD-1/2-9-C Datasheet - Page 4

• Manufacturer Part Number: DMS-40LCD-1/2-9-C
• Description: DPM ±2/20V LCD 9V-Pwr
• Manufacturer: Murata Power Solutions Inc

Specifications of DMS-40LCD-1/2-9-C

• Display Type: 4 - 1/2 Digit LCD
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

2. Differential Input Confi gurations: Differential measurements can be
APPLICATIONS
3. Engineering Scaling: For measuring voltages greater than the full
made with either 5V-powered or 9V-powered 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.
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.
120 VAC
AC to DC Converter
50kΩ < R1 + R2 < 10MΩ
R1 + R2
DP1
Figure 3. Differential Input Confi guration
R2
6
Figure 4. Input Attenuation Circuit
(+) IN HI
+5V SUP
x V
R1
(5V-Powered Models)
11
IN
DMS-40LCD-0/1-5
DMS-40LCD-0/1-5
1
V
= Reading
IN
(–) IN LO
RANGE
R2
12
2
–
3
5V RET
3
5V RET
12
11
(+) IN HI
(–) IN LO
www.murata-ps.com/dpm
R1
R2
R3
1k
1k
1k
4. Floating Signal Source Measurements: Floating signals can be
measured using the circuits shown in Figures 5 and 6. Figure 5 uses
a 5V-powered meter. Figure 6 uses a 9V-powered meter. Both fi gures
show a DMS-40LCD-0/1 with pin 2 tied to pin 1 yielding a ±2V input
range. Connecting pin 10 (ANALOG COMMON) 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.
4½ Digit, LCD Display Digital Panel Voltmeters
CELL
1.5V
CELL
1.5V
120 VAC
–
+
+
–
AC to DC Converter
Figure 5. Floating Input Measurements
Figure 6. Floating Input Measurements
ANA COMM
ANA COMM
(–) IN LO
(–) IN LO
(+) IN HI
(+) IN HI
BATTERY
DMS-40LCD Series
9V
11
10
12
+
11
10
12
(5V-Powered Models)
(9V-Powered Models)
5
+ BAT
V
S
U
04/05/11 MPM_DMS40LCD.C04 Page 4 of 6
P
1
1
RANGE
RANGE
+
–
DMS-40LCD-0/1-5
DMS-40LCD-0/1-9
2
2
email: [e-mail]
5
3
V
R
3
–BAT
E
T
DP1
6
DP1
6