Which part of the thermocouple is connected to the electronic circuit that measures voltage?

The correct answer relates to the concept of thermocouples and their operation in temperature measurement. In a thermocouple, the "Measuring Junction" is where the two different metals join and generate a voltage that varies with temperature. This junction is critical because it is directly influenced by the temperature of the environment being measured.

The reference junction, on the other hand, is not where the voltage measurement happens; instead, it serves as a stable temperature point used to determine the voltage reading accurately. The significance of the reference junction lies in its role in compensating for the temperature difference between the measuring junction and the reference point.

The term "Constant Reference Junction" is often used to describe an idealized reference junction that does not change temperature, ensuring accuracy in the voltage readings. However, in practical applications, this reference may not be entirely constant, yet it remains crucial in the thermoelectric measurement process to account for environmental conditions.

The "Display Junction" is not a recognized term in standard thermocouple terminology, which may lead to confusion. In typical setups, the display or readout unit is simply an output that translates the voltage signal into a readable temperature format but does not specifically define a junction in the context of thermocouple operation.