Resistance measuring circuit

Details Resistance measuring circuit Resistance measuring circuit

1976-12-03

1978-08-22

Krawczewicz, Stanley T.

Electricity: measuring and testing

Conductor identification or location

Inaccessible

73362AR, 324123C, G01R 2702

Patent

active

041091965

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 voltage drops across the unknown resistances are applied to the inverting and non-inverting inputs of a second operation amplifier 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.

REFERENCES:
patent: 3411081 (1968-11-01), Schulz
patent: 3437925 (1969-04-01), Gillette
patent: 3568044 (1971-02-01), Elazar
patent: 3817104 (1974-06-01), Sapir
patent: 3913403 (1975-10-01), Arcara

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