Automatic temperature measuring circuitry

Details Automatic temperature measuring circuitry Automatic temperature measuring circuitry

G - Physics

01

K

73/72

G01K 7/16 (2006.01) G01K 7/20 (2006.01)

Patent

CA 1205650

AUTOMATIC TEMPERATURE MEASURING CIRCUITRY Abstract of the Disclosure An AC temperature measurement circuit utilizing a standard platinum resistance thermometer (SPRT) which is supplied with a constant current through a precision resistance. The voltage across the SPRT is multiplied by a fixed gain by means of a high gain AC feedback amplifier. The ratio of the output of the fixed gain AC feedback amplifier to the AC reference voltage across the precision reference resistance is effectively determined using a digital-to-analog (D/A) transformer. The resistance value of the SPRT is then determined as a function of the reference resistance value, the value of the fixed gain, and the value of such ratio. Appropriate means are provided to determine the temperature represented by the resistance value of the SPRT.

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