Correcting Measurement Error due to Heating by Operating Current of Resistance Temperature Detectors

The assessment of temperature measurement errors by platinum resistance temperature detectors (RTD) was carried out. High measurement accuracy assured with their individual calibration, the voltage divider circuit for measuring resistance, the substitution method and the transitional measure. In this case, error due heating the RTDs by their operating current needs correction. The proposed method of correction of RTD’s error due to heating by the operating current decreased this error in two times. The residual error was estimated to be no more than 0.004°C.