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DMS-30PC Series
3? Digit, LED Display Low-Power,
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.
Miniature Digital Panel Voltmeters
and thermal run-away. When using other, higher-power, DMS-30PC
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. Additionally, analog
ammeters are not nearly as rugged as modern digital panel voltme-
ters. 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 represents
a basic ammeter connection diagram. A detailed application note
describing digital dc ammeters is included in DATEL's new Digital
Panel Meter Databook.
11
(+) IN HI
10
ANA COMM
DMS-30PC-1
8
REF OUT
+
1
+5V SUP
DMS-30PC-0
8
REF OUT
4-20mA
R1
12
(–) IN LO
7
REF IN
–
5Vdc
3
5V RET
7
9
1
3
6
REF IN
–
R2
1.23V
REF
5V SUP
5V RET
DP1
12
(–) IN LO
11
(+) IN HI
50k
1.5 Amp (Load Current)
0.150V
85-264Vac
AC to DC Converter
Figure 7. 4-to-20mA Current Loop Operation
0.1 W
R Shunt
Figure 9. Basic DC Ammeter Circuit
Load
(3.3 W )
8. External Gain Adjustment : Connect REFERENCE OUT
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-30PC-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-terminal regulator (LM-
(pin 8) to REFERENCE IN (pin 7) for normal, factory calibrated,
operation. Use the +1.23V REFERENCE OUT (pin 9) for applica-
tions needing external gain adjustment. Figure 10 shows the wiring
con?guration for each model. Calibration is performed with a precise,
near-full-scale, input voltage.
2931Z-5, available from National Semiconductor) to provide regulated
5V power to the meter. The LM-2931 was chosen because it has the
following on-chip protection features: reverse polarity, short circuit
OUT
VOLTAGE
CALIBRATOR
COM
11
(+) IN HI
3
5V RET
12
DMS-30PC
LM2931Z-5
(+) IN HI
11
1
+5V SUP
DMS-30PC-2-RL
(–) IN LO
10
ANA COMM
8
NC
7
REF IN
9
1.23V REF
IN
OUT
+
–
4.5 - 18Vdc
GND
22μF
10V
+
3
5V RET
5
8.45k, 1%
1k
10 to 20 Turns
Connections
for ±2V, ±20V
and ±200V models
DP2
Connections
7
REF
8
REF
12
(–) IN LO
1k
10 to 20 Turns
8.45k, 1%
for ±200mV
models
IN
OUT
Figure 10. External Gain Adjustment
Figure 8. 4.5-18V Power Supply Monitor
www.murata-ps.com/dpm
Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000
MPM_DMS_30PC.F05 Page 5 of 6
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相关代理商/技术参数
DMS-30PC-1-RL 功能描述:数字面板表 3.5 Digit +-2V Input Low Power Red 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-30PC-1-RL-C 功能描述:数字面板表 3.5 Digit +-2V Input Low Power Red 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-30PC-1-RS 功能描述:数字面板表 3.5 Digit +-2V Input Std Red 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-30PC-1-RS-C 功能描述:数字面板表 3.5 Digit +-2V Input Std Red 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
DMS30PC-1-RS-C 制造商:Murata Power Solutions 功能描述:Std red LED digital voltmeter,2V 14mm
DMS-30PC-1-VFS 功能描述:数字面板表 3.5 Digit +-2V Input Blue-Green 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-30PC-1-VFS-C 功能描述:数字面板表 3.5 Digit +-2V Input Blue-Green 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-30PC-1-YS 功能描述:数字面板表 3.5 Digit +-2V Input Std Yellow 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