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Chapter 4
Connecting Current Loop Inputs to RTD Channels
RTD channels on the DT9872 and DT9874 instruments have an input range of ±1.25 V.
Therefore, you can use a 1 shunt resistor to measure ±1.25 A. Similarly, you can use a 0.1
shunt resistor to measure ±12.5 A or a 10 shunt resistor to measure ±0.125 A.
Figure 22
is referenced to ±60 V.
Note: On the standard DT9874 instrument, channels 16 to 31 correspond to the RTD input
channels.
58
shows how to wire your signals to measure a current loop. In this example, the input
1
Circuit+
Use a 1
shunt resistor to convert current to voltage: 1
Figure 22: Connecting Current Loop Inputs to RTD Channels
RTD Channel
– Sense
+Sense
4
3
2
1
Shield
shunt resistor
+
60 V
–
= 1.25 A = 1.25 V.
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