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Wiring Signals
Thermocouple
Channels
+
–
+
1
series resistor
60 V
Circuit+
–
Use a 1
series resistor to convert current to voltage.
For thermocouple channels on the DT9871U and DT9874, 1
= 0.075 A = 0.075 V.
For thermocouple channels on the DT9871, 1
= 1.25 A = 1.25 V.
Figure 21: Connecting Current Loop Inputs to Thermocouple Channels
57
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