Current probe

Details Current probe Current probe

1995-02-28

1995-12-19

Nguyen, Vinh P.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Self-calibration

324117H, G01R 3306

Patent

active

054771358

ABSTRACT:
A current probe comprising a Hall device and a secondary winding in a flux linking relationship with a magnetic circuit is self-calibrated by disconnecting the Hall device from the winding, passing a current through the winding so as to induce a magnetic flux in the magnetic circuit, measuring voltage developed by the Hall device in response to linking by the magnetic flux, calculating the Hall gain of the Hall device, and then adjusting the gain of a scaling output amplifier on the basis of the calculated Hall gain to compensate for variation in Hall gain due to changes in operating conditions.

REFERENCES:
patent: 3525041 (1966-08-01), Velsink
patent: 4639665 (1987-01-01), Gary
patent: 4901008 (1990-02-01), Quastel et al.
patent: 5132608 (1992-07-01), Nishifuji et al.
patent: 5146156 (1992-09-01), Marcel

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