Cable length influence (2/3/4 wire connection)

[JochiSt]

For the implemented two wire connection, the wire resistance spoils the temperature with its bias resistance.

A three wire / four wire connection might be better than the existing two wire connection. But this needs proper evaluation first.

[JochiSt]

Four wire connection is rather difficult to implement, because this would require an additional differential amplifier stage at the PT100 input.

[JochiSt]

The 4 wire connection is implemented by using a differential amplifier. This should cancel out the cable losses.