- 您现在的位置：买卖IC网 > Sheet目录221 > DMS-40LCD-0/1-5-C (Murata Power Solutions Inc)DPM LCD 200MV/2VDC 4.5DIGIT
DMS-40LCD Series
4? Digit, LCD Display Digital Panel Voltmeters
APPLICATIONS
5. Process Control (4-to-20mA) Measurements: In many common
process-control applications, a 4-to-20mA current loop is used to
transmit information. Because DMS-40LCD meters have such high
input impedance, a simple shunt resistor across the meter’s input 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 requirements of
the particular application and can be calculated using the following
equation:
R Shunt = R1 = V Fsr / I Fsr
6. Power Supply Monitoring: A popular application for DATEL’s low-
power LCD meters is monitoring the supply voltage in battery-operated
portable equipment. Figure 8 demonstrates how a 9V-powered DMS-
40LCD can be used to monitor its own supply. The meter used is the
DMS-40LCD-0/1-9 con?gured for its ±2V input range (pin 2 connected
to pin 1). A three-resistor voltage divider is used to attenuate the bat-
tery voltage and also to satisfy the requirement that the input voltages
applied to pins 12 and 11 be at least 1.5 Volts above and below the
battery voltage applied to pins 1 (+BATTERY) and 3 (–BATTERY).
The divider should be designed so that 1/10th the battery voltage falls
across the inputs to the meter.
Where:
V Fsr = Full scale reading (in Volts)
I Fsr = Relative full scale current (in Amps)
R2
(R1 + R2 + R3)
= 0.1
Example: For a meter with a 2V full scale input (1.999 full
scale reading) and a desired full scale 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 50k Ω potentiometer (R2) to
display a reading of "0000" (assuming that is the desired
Therefore, the 9V battery voltage appears to the meter inputs as 0.9V.
With the decimal point moved to its DP2 position (pin 5 tied to pin 3),
the meter reads 9.000 Volts.
The circuit can be calibrated by ?rst measuring the actual battery volt-
age with another meter and then adjusting the gain-adjust potentiom-
eter on the back of the DMS-40LCD until a similar reading is obtained.
If possible, the resistors in the divider should be ±1% metal-?lm types
with TCR’s less than 50ppm/°C.
reading).
2. With 20mA applied, adjust the gain-adjust potentiometer on
the back of the meter to display a reading of "19999".
For different full scale readings, alter the value of R Shunt
accordingly.
DMS-40LCD-0/1-9
11
(+) IN HI
12
(–) IN LO
R1
45.3k
R2
10.1k
R3
1
2
3
5
45.3k
+
11
(+) IN HI
10
ANA COMM
DMS-40LCD-0/1-5
+BAT
9V
BATTERY
RANGE
+
–BAT
DP2
–
4-20mA
R1
12
(–) IN LO
1
2
3
Figure 8. Power Supply Monitor
R2
+5V SUP
RANGE
5V RET
(9V-Powered Models)
–
50k
120 VAC
AC to DC Converter
Figure 7. 4-to-20mA Current Loop Operation
(5V-Powered Models)
www.murata-ps.com/dpm
04/05/11
email: sales@murata-ps.com
MPM_DMS40LCD.C04 Page 5 of 6
发布紧急采购，3分钟左右您将得到回复。
相关PDF资料
DMS-40LCD-4/20S-C
METER LCD SELF-POWERED 4.5DIG
DMS-40PC-1-RL-BCD-C
DPM LED 2VDC 4.5DIG BCD LP RED
DMS-40PC-4/20S-24RS-I-C
METER DISP LED 4.5DIG 24V RED
DMU-30ACV-1-DR-C
VOLT METER LED 200ACV 0.1V RED
DMU-30DCV-2-DR-C
VOLT METER LED 20DCV 0.01V RED
DN-91648U
PATCH PANEL 19" 48PORT RJ45 CAT6
DPM125L
METER DPM LCD3.5DIGIT 200MV BKLT
DPM1AS-BL
LCD 5.5MM UNIV MINI METER BK LIT
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