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参数资料
| 型号： | DMS-20PC-3-BL-C |
| 厂商： | Murata Power Solutions Inc |
| 文件页数： | 5/6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
Example: For a meter with a 2V full scale input (1.999 full scale
reading) and a desired display reading of "1000" (with an
input of 20mA), V Fsr = 1.000 Volts
R Shunt = 1.000V/(0.020 – 0.004)A
R Shunt = 1.000V/0.016A = 62.5 Ohms
To calibrate the circuit of Figure 7, perform the following:
1. With 4mA applied, adjust the 50kΩ potentiometer (R2) to
display a reading of "000" (assuming that is the desired
reading).
2. With 20mA applied, adjust the gain-adjust potentiometer
on the back of the meter to display a reading of "1000".
For different full scale readings, alter the value of R Shunt
accordingly.
Digital Panel Voltmeters
The LM-2931 was chosen because it has the following on-chip
protection features: reverse polarity, short circuit and thermal
runaway. When using other, higher-power, DMS-20PC models
with three-terminal regulators, be sure to consult the regula-
tor manufacturer's data sheet to ensure the regulator is being
utilized safely and correctly.
7. Digital Ammeter: Digital ammeters are ?nding ever-increasing
usage because analog-style ammeters (moving-vane types)
now cost roughly the same as their digital counterparts. Addi-
tionally, analog ammeters are not nearly as rugged as modern
digital panel voltmeters. Figure 9 illustrates a typical ammeter
application. The circuit uses a ±200mV input meter — the
preferred range for most ammeters — to measure the voltage
developed across a 0.1Ω current shunt. The circuit shown
basic connection diagram. Click
represents a http://www.murata-ps.com/data/meters/dms-an6.pdf
11
(+) IN HI
10
ANA COMM
DMS-20PC-1
8
REF OUT
view a detailed application note describing digital dc ammeters.
4-20mA
R1
12
(–) IN LO
7
REF IN
+
1
+5V SUP
2
DISP EN
DMS-20PC-0
8
REF OUT
–
R2
50k
1
+5V SUP
2
DISPLAY
ENABLE
3
5V RET
–
5Vdc
3
5V RET
6
DP1
12
11
7
REF IN
(–) IN LO
(+) IN HI
85-264Vac
1.5 Amp (Load Current)
0.150V
AC to DC Converter
0.1W
R Shunt
Load
(3.3 W )
Figure 7. 4-to-20mA Current Loop Operation
Figure 9. Basic DC Ammeter Circuit
6. Power Supply Monitoring: One of the most common digital
panel meter applications involves monitoring the output voltage
of the system power supply — often this supply also powers the
meter itself. The low-power, red LED DMS-20PC-2-RL can be
con?gured to allow power supply monitoring over the range of
4.5-18Vdc. The circuit in Figure 8 uses a low-drop-out, three-ter-
minal regulator (LM-2931Z-5, available from National Semicon-
8. External Gain Adjustment : Connect REFERENCE OUT
(pin 8) to REFERENCE IN (pin 7) for normal, factory calibrated,
operation. Use the circuit shown in Figure 10 for applications
needing external gain adjustment. Calibration is performed
with a precise, near-full-scale, input voltage.
ductor) to provide regulated 5V-power to the meter.
OUT
11
(+) IN HI
3
DMS-20PC-1
1
DMS-20PC-2-RL
12
VOLTAGE
CALIBRATOR
5V RET
+5V IN
LM2931Z-5
12
+
–
4.5 - 18Vdc
IN
OUT
GND
22μF
10V
+
1
+5V SUP
2
DISP EN
3
5V RET
11 (+) IN HI
COM
(–) IN LO
10
ANA
COMM
8
NC
8.06k, 1%
7
REF
IN
2k
1
17.4k, 1%
Connections
for ±2V, ±20V
and ±200V models
5
DP2
7
REF
8
REF
12
(–) IN LO
732, 1%
200
1
24.3k, 1%
Connections
for ±200mV
models
IN
OUT
1
= 10 to 20 Turns
Figure 8. 4.5-18V Power Supply Monitor
Figure 10. External Gain Adjustment
www.murata-ps.com/support
MPM_DMS_20PC.D07 Page 5 of 6
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