Ohmmeter for circuits carrying unknown currents

Details Ohmmeter for circuits carrying unknown currents Ohmmeter for circuits carrying unknown currents

1976-07-28

1977-09-06

Krawczewicz, Stanley T.

Electricity: measuring and testing

Conductor identification or location

Inaccessible

G01R 2702

Patent

active

040471047

ABSTRACT:
A direct reading ohmmeter for neutralizing the effects of foreign voltages is disclosed including alternately connected stages for registering the Thevenin Equivalent open circuit voltage across test probes as well as a voltage whose value is a function of the resistance to be measured, and circuitry monitoring these stages for determining the value of the unknown resistance by a continuous subtraction of the stored voltages.

REFERENCES:
patent: 1905348 (1933-04-01), Edwards et al.
patent: 2578455 (1951-12-01), Seely
patent: 3172038 (1965-03-01), Goodman, Jr.
patent: 3417331 (1968-12-01), Gauss, Jr.
patent: 3675122 (1972-07-01), Rose

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