Does the length of the thermocouple compensation wire affect the measurement results?

Thermocouple compensation wires are an important component of thermocouple measurement circuits. Its main function is to connect thermocouples with measuring instruments and offset the impact of cold end temperature changes in the connecting circuit on the measurement results through compensating wires. However, the length of the compensating wire does have a certain impact on the measurement results, which is determined by the working principle of the thermocouple.

A thermocouple is a thermocouple formed by using wires of two different materials to generate a thermoelectric potential. When there is a temperature difference between the contact points of two wires, a thermoelectric potential is generated. This thermoelectric potential is directly proportional to the temperature difference, and the magnitude of the temperature difference can be determined by measuring the magnitude of the thermoelectric potential. However, the measurement principle of thermocouples is based on the temperature difference between two wires, rather than directly measuring temperature.