Alternating current comparator bridge for resistance...

Details Alternating current comparator bridge for resistance... Alternating current comparator bridge for resistance...

G - Physics

01

R

324/45

G01R 27/14 (2006.01) G01R 17/10 (2006.01)

Patent

CA 1154828

TITLE AN ALTERNATING CURRENT COMPARATOR BRIDGE FOR RESISTANCE MEASUREMENT INVENTORS William J.M. Moore Norbert L. Kusters ABSTRACT OF THE DISCLOSURE The ac current comparator bridge measures the resistance of an unknown resistor at 50-60 Hz with an accuracy in the order of 10 parts per million. The current in the unknown resistor is compared, using a current comparator, to the current in a reference resistor for the in-phase component, and to the current in a reference capacitor for the quadrature component or phase defect. Once an ampere-turn balance is achieved in the comparator by adjusting the winding turns, the unknown resistor's values are a function of the reference resistor, the reference capacitor, the voltage sources driving the currents through the unknown resistor and the references, as well as the turns of the windings.

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