What should be considered when measuring temperature with thermocouples?

What should be considered when measuring temperature with thermocouples?


Thermocouple temperature measurement, requires reference value / or must be compensated.
When the thermocouple measures the temperature, the temperature of the cold end (the measuring end is the hot end, the end connected to the measuring circuit through the lead wire is called the cold end) is kept constant, and the thermoelectric potential is proportional to the measured temperature. If the temperature of the cold end (environment) changes during the measurement, the accuracy of the measurement will be seriously affected. Some measures are taken at the cold end to compensate for the effect of the cold junction temperature change, which is called the cold junction compensation of the thermocouple.