Minimax Approximation of the Resistance-Temperature Thermistor’s Dependence

Abstract

The evidence to support feasibility of using minimax approximation to calculate the parameters of thermistors’ thermometric characteristic models has been provided. Minimax approximation ensures the achievement of the minimum possible calibration error, while the least squares method minimizes the sum of squared errors. A rational expression has been proposed to describe the dependence of temperature on thermistor’s resistance. The effectiveness of the model in the form of a rational expression is illustrated with actual calibration results. This model provides higher accuracy in reproducing temperature compared to generalized Steinhart-Hart models.