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DMS-40LCD Series
4? Digit, LCD Display Digital Panel Voltmeters
APPLICATIONS
2. Differential Input Con?gurations: Differential measurements can be
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.
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 ?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.
6
DMS-40LCD-0/1-5
11
(+) IN HI
R1
1k
A “?oating” input is a signal that has no galvanic connection to the
meter’s power supply. In the ?gures below, the 1.5V battery illustrates a
true ?oating input.
DP1
12
R2
1k
(–) IN LO
11
DMS-40LCD-0/1-5
1
+5V SUP
2
RANGE
3
5V RET
R3
1k
1.5V
+
(+) IN HI
10
ANA COMM
CELL
120 VAC
–
12
(–) IN LO
1
2
3
6
AC to DC Converter
+ 5 V S U P
RANGE
5 V R E T
DP1
Figure 3. Differential Input Con?guration
(5V-Powered Models)
120 VAC
AC to DC Converter
3. Engineering Scaling: For measuring voltages greater than 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
Figure 5. Floating Input Measurements
(5V-Powered Models)
be precision, ±1%, metal ?lm resistors with absolute TCR’s less than
50ppm/°C. See Ap Note 4 for more information on engineering scaling.
11
(+) IN HI
DMS-40LCD-0/1-9
50k Ω < R1 + R2 < 10M Ω
1.5V
CELL
+
10
ANA COMM
R2
x V IN = Reading
–
12
(–) IN LO
R1 + R2
1
+ BAT
2
RANGE
3
–BAT
6
DP1
DMS-40LCD-0/1-5
+
9V
BATTERY
–
11
(+) IN HI
R1
12
(–) IN LO
R2
3
5V RET
Figure 6. Floating Input Measurements
(9V-Powered Models)
V IN
–
Figure 4. Input Attenuation Circuit
www.murata-ps.com/dpm
04/05/11
email: sales@murata-ps.com
MPM_DMS40LCD.C04 Page 4 of 6
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相关代理商/技术参数
DMS-40LCD-0/1-9 功能描述:数字面板表 4.5 Digit Volt Meter +-200mVto+-2V / +9V RoHS:否 制造商:Murata Power Solutions 设备类型:AC Voltmeters 显示器类型:LED, 3 Digit, Red 工作电源电压:85 VAC to 264 VAC 工作电源电流:50 mArms 输入电流:50 mA 输入频率: 输入电压:120 VAC 系列:DMS-20PC-1-LM
DMS-40LCD-0/1-9B 功能描述:数字面板表 4.5 Digit Volt Meter +-200mVto+-2V / +9V RoHS:否 制造商:Murata Power Solutions 设备类型:AC Voltmeters 显示器类型:LED, 3 Digit, Red 工作电源电压:85 VAC to 264 VAC 工作电源电流:50 mArms 输入电流:50 mA 输入频率: 输入电压:120 VAC 系列:DMS-20PC-1-LM
DMS-40LCD-0/1-9B-C 功能描述:数字面板表 4.5 Digit Volt Meter +-200mVto+-2V / +9V RoHS:否 制造商:Murata Power Solutions 设备类型:AC Voltmeters 显示器类型:LED, 3 Digit, Red 工作电源电压:85 VAC to 264 VAC 工作电源电流:50 mArms 输入电流:50 mA 输入频率: 输入电压:120 VAC 系列:DMS-20PC-1-LM
DMS-40LCD-0/1-9-C 功能描述:数字面板表 4.5 Digit Volt Meter +-200mVto+-2V / +9V RoHS:否 制造商:Murata Power Solutions 设备类型:AC Voltmeters 显示器类型:LED, 3 Digit, Red 工作电源电压:85 VAC to 264 VAC 工作电源电流:50 mArms 输入电流:50 mA 输入频率: 输入电压:120 VAC 系列:DMS-20PC-1-LM
DMS-40LCD-1/2-5 功能描述:数字面板表 4.5 Digit Volt Meter +-2Vto+-20V / +5V RoHS:否 制造商:Murata Power Solutions 设备类型:AC Voltmeters 显示器类型:LED, 3 Digit, Red 工作电源电压:85 VAC to 264 VAC 工作电源电流:50 mArms 输入电流:50 mA 输入频率: 输入电压:120 VAC 系列:DMS-20PC-1-LM
DMS-40LCD-1/2-5B 功能描述:数字面板表 4.5 Digit Volt Meter +-2Vto+-20V / +5V RoHS:否 制造商:Murata Power Solutions 设备类型:AC Voltmeters 显示器类型:LED, 3 Digit, Red 工作电源电压:85 VAC to 264 VAC 工作电源电流:50 mArms 输入电流:50 mA 输入频率: 输入电压:120 VAC 系列:DMS-20PC-1-LM
DMS-40LCD-1/2-5B-C 功能描述:数字面板表 4.5 Digit Volt Meter +-2Vto+-20V / +5V RoHS:否 制造商:Murata Power Solutions 设备类型:AC Voltmeters 显示器类型:LED, 3 Digit, Red 工作电源电压:85 VAC to 264 VAC 工作电源电流:50 mArms 输入电流:50 mA 输入频率: 输入电压:120 VAC 系列:DMS-20PC-1-LM
DMS-40LCD-1/2-5-C 功能描述:数字面板表 4.5 Digit Volt Meter +-2Vto+-20V / +5V RoHS:否 制造商:Murata Power Solutions 设备类型:AC Voltmeters 显示器类型:LED, 3 Digit, Red 工作电源电压:85 VAC to 264 VAC 工作电源电流:50 mArms 输入电流:50 mA 输入频率: 输入电压:120 VAC 系列:DMS-20PC-1-LM