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Table 2. Signal Descriptions
Signal
Description
COM
Common reference connection to isolated ground
TC
Thermocouple connection
Thermocouple Connections
TC–
TC+
Shield
NI 9210
COM
Thermocouple
Connect the COM terminal to a common-mode voltage reference
on the thermocouple. A valid common-mode voltage reference is
a voltage that is within ±1.5 V of the common-mode voltage of
all the connected thermocouples
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NI 9210 Getting Started Guide