Electromagnetic device with magnetic null means

Details Electromagnetic device with magnetic null means Electromagnetic device with magnetic null means

1978-03-13

1980-04-08

Tokar, M.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

With electromagnetic field

G01R 120

Patent

active

041974948

ABSTRACT:
An electromagnetic device is disclosed for use in a polygraph instrument for moving a recording pen in response to sensed electric current. The device includes a movable magnet that is rotated by a magnetic field produced by the sensed current flowing through the coil of an electromagnet. Null magnets are releasably held at selected positions and in a particular arrangement relative to the movable magnet and have their respective magnetic field strengths and positions such that they automatically return the movable magnet to a null position when the current being sensed is removed from the coil.

REFERENCES:
patent: 3275936 (1966-09-01), Huston
patent: 3867696 (1975-02-01), Raymond

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