Temperature measurements by means of NTC resistors and a two-parameter approximation curve (CROSBI ID 139294)
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Ilić, Damir ; Butorac, Josip ; Ferković, Luka
engleski
Temperature measurements by means of NTC resistors and a two-parameter approximation curve
Table data for resistance-versus-temperature (R-T) dependence of negative temperature coefficient resistors (NTCRs), which have resistance RN = 10000 ohm at a temperature of 25 °C and limits of error 0.2 °C in the range from 0 °C to 70 °C [1-4], are analysed. Determination of two approximation curves is described: a three-parameter one (abbreviated AC1) and a two-parameter one (AC2). These curves are compared with the three-parameter Steinhart-Hart equation (S&H) by using the table data of resistance for different NTCRs and calculating the following for all of them: unknown parameters by the least-squares method, approximated temperature using determined parameters, and the difference from the table data of temperature. The obtained results are presented, showing a very good agreement of curves, with their mutual differences within a few millikelvins, and the differences from the table data mostly within 10 mK for the range from 0 °C to 70 °C (differences are larger only at a few points). Therefore, the presented two-parameter approximation curve AC2 can be very conveniently used with some NTCRs for the calculation of unknown temperature from the measured resistance.
NTC resistors; approximation curve; least-squares method
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