Resistance measuring circuit

Details Resistance measuring circuit Resistance measuring circuit

G - Physics

01

R

324/45

G01R 27/02 (2006.01) G01R 27/14 (2006.01)

Patent

CA 1079807

APPLICATION OF JOSEPH P. CARMODY RESISTANCE MEASURING CIRCUIT ABSTRACT A resistance measuring circuit for providing an output signal which is linearly proportional to the difference in resistance between two unknown resistances. The measuring circuit includes a constant current source for driving both unknown resistances in a series circuit by connecting the series circuit in a feedback loop of an operational amplifier. The volt- age drops across the unknown resistances are applied to the inverting and non-inverting inputs of a second operation ampli- fier used as a differential amplifier, respectively. The effect of leadwire resistance to the unknown resistances is cancelled by the subtractive operation of the second amplifier. Further, the first amplifier is supplied with a variable input signal to provide a zero suppression capability for the linear output signal.

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