Question { SRACO, 5222 }

what is meant by cold junction compensation. where it is used.

Answer

When the cold junction is not at 0°C, the temperature of
this junction must be known in order to determine the
actual hot-junction temperature. The output voltage of the
thermocouple must also be compensated to account for the
voltage created by the nonzero cold-junction temperature.
This process is known as cold-junction compensation