Calibration and R-T Characteristics of NTC Thermistor

Abstract

The resistance of NTC thermistors is decrease with the increase of temperature,and they generally have nonlinear resistance(R)-temperature(T) behavior.In practice,such thermistor sensor needs to be individually calibrated over the operating temperature range to ascertain the R-T characteristics.The MF501 thermistor applied in spacecraft thermal test was illustrated in this paper to introduce a simple and effective calibration and data processing method.The fitting residual,average error and function transfer error were selected to assess the adequateness of the method.The result showed that the calibration error could be controlled within 0.45 ℃ based on three-point calibration over the operating temperature range and the precision was fully satisfied.Calibration precision could be improved with increasing the calculated calibration points.