Method of and circuit for ohmmeter calibration

Details Method of and circuit for ohmmeter calibration Method of and circuit for ohmmeter calibration

1987-12-02

1989-06-20

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Conductor identification or location

Inaccessible

324 62, 374173, 73 1R, G01R 2702

Patent

active

048412295

ABSTRACT:
The calibrator of an ohmmeter is compensated to eliminate any error as a result of the resistance of leads interconnecting terminals of the ohmmeter and a reference resistance to which the ohmmeter is connected during calibration. In accordance with one aspect of the invention, ohmmeter current flowing through a buffer amplifier biased by a floating power supply bypasses the ohmmeter leads. In accordance with another aspect, a current equal in magnitude but opposite in direction to the ohmmeter current is applied to the leads.

REFERENCES:
patent: 3805616 (1974-04-01), Sugiyama
patent: 4041382 (1977-08-01), Washburn
patent: 4169243 (1979-09-01), Payne et al.
patent: 4309653 (1982-01-01), Stack et al.
patent: 4323972 (1982-04-01), Winter

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