RTD Self-Heating Effect


#1

When electrical energy is applied to a resistor it generates thermal energy which in turn radiates heat creating uncertainty, this is known as the self-heating effect.

At high temperatures it has little effect on temperature and thus temperature measurement, however at low temperatures or where accurate measurement is required heat generated by self-heating must be taken into account and eliminated. It is possible to reduce self-heating by reducing the measurement current to the detector.