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| 型号： | DMS-20PC-3-BL-C |
| 厂商： | Murata Power Solutions Inc |
| 文件页数： | 4/6页 |
| 文件大小： | 0K |
| 描述： | DPM LED 200V 3.5DIGIT LO-PWR BLU |
| 产品培训模块： | DMS-20PC Series |
| 产品目录绘图： | Digital Panel Meter |
| 特色产品： | DMS-20PC Series Panel Meters |
| 3D 型号： | DMS-20PC-x.pdf DMS-20PC-x.sldprt DMS-20PC-x.stp DMS-20PC-x.igs |
| 标准包装： | 12 |
| 系列： | DMS-20PC |
| 类型： | 伏特表 |
| 测量范围： | ±200V |
| 显示器样式： | 蓝色字符，黑色背景 |
| 显示器类型： | LED |
| 显示器正面尺寸： | 1.30" L x 0.80" W（33.0 x 20.3mm） |
| 显示器位数： | 3.5 |
| 显示器位数 - 高度： | 0.370"（9.40mm） |
| 背光： | 无 |
| 安装类型： | 面板安装 |
| 端子： | PC 引脚 |
| 电源电压： | 4.75 ~ 5.25V |
| 产品目录页面： | 2856 (CN2011-ZH PDF) |
| 其它名称： | 811-1969 |
DMS-20PC Series
3? Digit, LED Display, Low-Cost, Subminiature
APPLICATIONS
2. Differential Input Con?gurations : Differential measurements
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.
Digital Panel Voltmeters
4. Floating Signal Source Measurements : Floating signals can be
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 "?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.
REF OUT
8
DMS-20PC-1
11
(+) IN HI
R1
1k
11
(+) IN HI
DMS-20PC-1
8
REF OUT
R2
REF IN 7
DP1 6
12
(–) IN LO
1k
1.5V
CELL
–
12
(–) IN LO
7
1
+5V SUP
2
DISPLAY
ENABLE
3
5V RET
R3
1k
1
+5V SUP
2
DISPLAY
3
5V
REF IN
6
DP1
85-264Vac
AC to DC Converter
85-264Vac
AC to DC Converter
ENABLE
RET
Figure 3. Differential Input Con?guration
Figure 5. Floating Input Measurements
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
11
(+) IN HI
10
DMS-20PC-1
8
REF OUT
shown in Figure 4) will scale the input to within the range of
the selected meter. R1 and R2 should be precision, ±1%,
metal-?lm resistors with absolute TCR's less than 50ppm/°C.
1.5V
CELL
–
ANA COMM
12
(–) IN LO
7
REF IN
See Ap Note 4 for more information on engineering scaling.
1
+5V SUP
2
DISPLAY
3
5V
6
DP1
ENABLE
RET
50k Ω < R1 + R2 < 10M Ω
R2
x V IN = Reading
R1 + R2
85-264Vac
AC to DC Converter
Figure 6. Floating Input Measurements
(Alternate Con?guration)
R1
11
(+) IN HI
DMS-20PC-1
8
V IN
R2
12
REF OUT
5. Process Control (4-to-20mA) Measurements : In many common
process-control applications, a 4-to-20mA current loop is used to
–
(–) IN LO
7
REF IN
transmit information. Because DMS-20PC meters have such high
input impedance, a simple shunt resistor across the meter's input
1
+5V SUP
2
DISPLAY
ENABLE
3
5V RET
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
85-264Vac
AC to DC Converter
the following equation:
R Shunt = R1 = V Fsr / I Fsr
Figure 4. Input Attenuation Circuit
Where:
V Fsr = Full scale reading (in Volts)
I Fsr = Relative full scale current (in Amps)
www.murata-ps.com/support
MPM_DMS_20PC.D07 Page 4 of 6
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