Correlation Study of a Thermistor Thermometer

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Abstract
Using a thermistor in a dc bridge configuration, a relationship is developed between the bridge open‐circuit output potential and the absolute temperature. This thermistor function accurately predicts temperature magnitudes and changes in temperature over large spans. The inflected shape of the bridge open‐circuit output potential versus absolute temperature allows for an excellent linearization of the output potential over an appreciable temperature range. The function is completely determined by the temperature coefficient of resistance of the thermistor, by a characteristic bridge resistance ratio, and by the absolute temperature. The function has been programmed satisfactorily in FORTRAN IV.

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