dms-40lcd ETC-unknow, dms-40lcd Datasheet - Page 4

• Manufacturer Part Number: dms-40lcd
• Description: Panel Cutout Punch For Dms-30/40
• Manufacturer: ETC-unknow

2. Differential Input Configurations: 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.
120 VAC
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
DP1
UPA-5/500
DATEL
6
50k < R1 + R2 < 10M
R1 + R2
Figure 3. Differential Input Configuration
R2
+5V SUP
Figure 4. Input Attenuation Circuit
(+) IN HI
DMS-40LCD-0/1-5
1
x V
R1
(5V-Powered Models)
11
IN
DMS-40LCD-0/1-5
RANGE
V
= Reading
IN
2
(–) IN LO
R2
12
–
3
5V RET
3
5V RET
www.murata-ps.com
11
12
(–) IN LO
(+) IN HI
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 figures
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 “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.
4½ Digit, LCD Display Digital Panel Voltmeters
CELL
1.5V
CELL
1.5V
120 VAC
–
+
Technical enquiries email: [e-mail], tel:
+
–
AC to DC Converter
Figure 5. Floating Input Measurements
Figure 6. Floating Input Measurements
UPA-5/500
ANA COMM
DATEL
ANA COMM
(–) IN LO
(+) IN HI
(–) IN LO
(+) IN HI
BATTERY
DMS-40LCD Series
9V
11
10
12
(5V-Powered Models)
(9V-Powered Models)
11
10
12
+5V SUP
+ BAT
1
1
RANGE
RANGE
+
–
DMS-40LCD-0/1-5
DMS-40LCD-0/1-9
2
2
MPM_DMS40LCD.C02 Page 4 of 6
3
5V RET
3
–BAT
[phone]
DP1
6
DP1
6