Cold-Junction Temperature Sensor Channel
The NI PXI-2501/2503 has a dedicated temperature sensor channel useful for cold-junction compensation when switching thermocouples. The NI TB-2605 and TBX-68S terminal blocks both have onboard temperature sensors that connect to the dedicated cold-junction sensor channel. You can access the cold-junction sensor channel by connecting to channel cjtemp in the 2-wire 24×1 multiplexer, 2-wire dual 12×1 multiplexer, and 2-wire quad 6×1 multiplexer topologies.