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DMS-30LCD Series
3? Digit, LCD Display Digital Panel Voltmeters
APPLICATIONS
Where:
R Shunt = R1 = V Fsr / I Fsr
V Fsr = Full scale reading (in Volts)
R2
(R1 + R2 + R3)
= 0.1
I Fsr = Relative full scale current (in Amps)
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:
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 9.00 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-30LCD 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.
1. With 4mA applied, adjust the 50k Ω potentiometer (R2) to
display a reading of "000" (assuming that is the desired
8
REF OUT
DMS-30LCD-1-9
11
(+) IN HI
R1
45.3k
reading).
R2
2. With 20mA applied, adjust the gain-adjust potentiometer on
the back of the meter to display a reading of "1999". For different full
7
REF IN
12
(–) IN LO
10.1k
R3
scale readings, alter the R Shunt value accordingly.
1
+BAT
3
–BAT
5
DP2
45.3k
DMS-30LCD-1-5
9V
BATTERY
(+) IN HI
8
REF OUT
–
ANA COMM
Figure 8. Power Supply Monitor
4-20mA
R1
(–) IN LO
7
REF IN
(9V-Powered Models)
1
3
R2
+5V SUP
5V RET
–
120 VAC
50k
AC to DC Converter
7. External Gain Adjustment: Connect REFERENCE OUT
(pin 8) to REFERENCE IN (pin 7) for normal, factory calibrated, opera-
tion. Use the +1.23V REFERENCE OUT (pin 9) for applications need-
ing external gain adjustment. Figure 9 shows the wiring con?guration
for each model. Calibration is performed with a precise, near-full-scale,
input voltage.
Figure 7. 4-to-20mA Current Loop Operation
(5V-Powered Models)
11
DMS-30LCD
6. Power Supply Monitoring: A popular application for DATEL’s low-
OUT
(+) IN HI
power LCD meters is monitoring the supply voltage in battery-oper-
ated portable equipment. Figure 8 demonstrates how a 9V-powered
DMS-30LCD can be used to monitor its own supply. The meter used
12
VOLTAGE
CALIBRATOR
COM
3
5V RET
12
(–) IN LO
is the DMS-30LCD-1-9. A three-resistor voltage divider is used to
attenuate the battery 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 bat-
tery voltage falls across the inputs to the meter:
For 5V models tie
(–) IN LO to pin 3
For 9V models tie
(–) IN LO to pin 10
10
ANA COMM
8
NC
8.45k, 1%
1k
7
REF IN
1k
10 to 20 Turns
8.45k, 1%
9
1.23V REF
Connections
for ±2V and
±20V models
Connections
for ±200mV
10 to 20 Turns
Figure 9. External Gain Adjustment
models
www.murata-ps.com/dpm
06 Jan 2011
email: sales@murata-ps.com
MPM_DMS30LCD.D02 Page 5 of 6
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相关代理商/技术参数
DMS-30LCD-2-5
功能描述:数字面板表 3.5 Digit Volt Meter +-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
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制造商:Murata Power Solutions 功能描述:INDICATOR DMS 30LCD-2-5
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功能描述:数字面板表 3.5 Digit Volt Meter +-20V / +5V Backlit 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
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功能描述:数字面板表 3.5 Digit Volt Meter +-20V / +5V Backlit 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
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功能描述:数字面板表 3.5 Digit Volt Meter +-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
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功能描述:数字面板表 3.5 Digit Volt Meter +-20V / +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
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功能描述:数字面板表 3.5 Digit Volt Meter +-20V / +9V Backlit 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-30LCD-2-9B-C
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