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DMS-30DR Series
Sunlight Readable, 3? Digit Panel Meters
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 50k Ω 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.
with Auto-Dimming LED Displays
represents a basic ammeter connection diagram. A detailed application
note describing digital dc ammeters is available at www.cd4power.com.
11
(+) IN HI
DMS-30DR-1
8
REF OUT
Figure 8. Basic DC Ammeter Circuit
10
ANA COMM
4-20mA
R1
12
(–) IN LO
7
REF IN
7. External Gain Adjustment: Connect REFERENCE OUT
(pin 8) to REFERENCE IN (pin 7) for normal, factory calibrated,
–
R2
9
1.225V
REF
1
5V SUP
3
5V RET
operation. Use the +1.225V REFERENCE OUT (pin 9) for applica-
tions needing external gain adjustment. Figure 10 shows the wiring
50k
con?guration for each model. Calibration is performed with a precise,
near-full-scale, input voltage.
85-264Vac
AC to DC Converter
Figure 7. 4-to-20mA Current Loop Operation
6. 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 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 0.1 Ω current shunt. The circuit shown
Figure 9. External Gain Adjustment
www.murata-ps.com/dpm
03 Aug 2010
email: sales@murata-ps.com
MPM_DMS-30DR.B05 Page 5 of 6
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相关PDF资料
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DMS-30LCDA-4/20S-C
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DMS-40PC-4/20S-24RS-I-C
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相关代理商/技术参数
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制造商:DELTA 制造商全称:Delta Electronics, Inc. 功能描述:Daylight Readable, 3 Digit Panel Meters with Auto-Dimming LED Displays
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