Method and apparatus for measuring the current flowing in a work

Details Method and apparatus for measuring the current flowing in a work Method and apparatus for measuring the current flowing in a work

1976-03-08

1977-11-22

Corcoran, Robert J.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

With coupling means

324251, 324117H, 324225, G01R 3300

Patent

active

040597989

ABSTRACT:
Magnetic cores of clamp-on type current measuring devices having a Hall-effect device for measurement of D.C. currents are provided with stabilizing coils which are periodically energized to substantially eliminate the characteristic hysteresis effect of the core material. A magnetic core of the type which is split to permit opening and subsequent clamping onto a conductor, has one section thereof provided with an air gap in which the Hall-effect device is positioned. A stabilizing coil is positioned on one section of the magnetic core and the coil and is periodically energized with a damped oscillatory current. This damped oscillatory current is at least applied immediately prior to the taking of any current measurement and is preferably applied periodically to maintain the stability of the magnetic core.

REFERENCES:
patent: 3482163 (1969-12-01), Peek et al.
patent: 3706032 (1972-12-01), Vikstrom

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