Omega RD200 - Manual (Page 106)

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17. Other Options 17.1 Shunt Resistor for Current Input
DC current input can be measured by attaching a shunt resistor (option) to the input terminals.
1 Shunt resistor (Option) and Measurement
current range
• A shunt resistor converts the DC current input into
a DC voltage. The two types shown in the right
table are available.
• The current measuring ranges are shown in the
right table, too.
2 Connection
Connect a shunt resister to each channel for the DC
current measurement.
Only one shunt resistor is to be connected to a
channel.
3 [Range/Printing range] and [Scale]
1) Range No.
The converted voltage with any shunt resistor is
±5 V
DC and the range No. is “07”.
2) Printing range
Program the printing range with the value after being
converted into a voltage.
• Minimum value:
Min. input current x shunt resistor value
• Maximum value:
Max. input current x shunt resistor value
3) Scale
Program the scale with the physical quantity against
the input current.
• Minimum value:
Physical quantity of the minimum input current
• Maximum value:
Physical quantity of the maximum input current
Code
Resistance
value*
Measuring
range
EZ-RX100 100
Ω ±50mA DC
EZ-RX250 250
Ω ±20mA DC
Accuracy: 100
Ω - Rated value ±0.05%
250
Ω – Rated value ±0.1%
Resistan
ce value
Measuring
range
Converted
voltage
Range
No.
100
Ω ±50mA DC ±5VDC 07
250
Ω ±20mA DC ±5VDC
07
20mA>
Use the shunt resistor of 250
Ω
for the
maximum measuring current of 20mA.
• Minimum value: 4 (mA) x 250 ( Ω) = 1 (V)
• Maximum value: 20 (mA) x 250 ( Ω) = 5 (V)
litter/m
2
>
• Minimum value: 0 • Maximum value: 500
Caution on connections Remarks
+
-
+
-
100 Ω or
250 Ω
CH 1
Shunt Resistor
Measuring
current source Recorder
Ex) Connection of a shunt resistor to CH1
Using Range No.
Example of printing range
Example of scale programming
Shunt resistor and measuring range