Abstract: In order to improve measuring-temperature accuracy of the NTC thermistors, we discuss two NTC thermistors calibration equations. Firstly, we use the least square method to solve coefficients of equation with MATLAB, and then use a measurement standard uncertainty on two kinds of correction equations to fit precision evaluation, achieve high precision NTC thermistor correction equation. Finally, based on the cases of water temperature measureruent in the laboratory, NTC thermistor linear correction equation can be used in the actual teaching experiment environment.

Key words: NTC thermistors calibration equations, least square method, A measurement standard uncertainty