Electricity: measuring and testing – Magnetic – Calibration
Patent
1989-08-04
1991-07-16
Wieder, Kenneth A.
Electricity: measuring and testing
Magnetic
Calibration
324537, 324381, 324117H, G01R 3500
Patent
active
050327917
ABSTRACT:
An apparatus for testing the operativeness of a Hall effect device (HED), such as in an automotive application, without requiring removal of the HED for testing. The apparatus includes a connector for connection to the HED, a connector for connection to a voltage supply, and an indicator. A permanent magnet is physically positioned with respect to the HED so that a properly functioning HED would produce a Hall effect current within a predetermined range. A ferrous metal strip is provided, shiftable between an interference position between the permanent magnet and the HED and a clear position not between the permanent magnet and the HED. The indicator is connected so as to be lit when the HED is producing a current within the predetermined range, and not lit when the HED is not producing a current within the predetermined range. Also disclosed is a method for testing the operativeness of a HED. The method includes supplying a testing apparatus as described above. The apparatus is connected to inputs of the HED, and the indicator observed. The metal strip is then positioned between the permanent magnet and the HED, and the indicator observed, to determine whether the HED is producing a current of at least the predetermined level. In a disclosed embodiment, the HED constitutes part of a vehicle engine distributor, and the ferrous metal strip may be a distributor rotor vane.
REFERENCES:
patent: 3210653 (1965-10-01), Williams
patent: 3241055 (1966-03-01), Knudsen
patent: 4156191 (1979-05-01), Knight
patent: 4488112 (1984-12-01), Thompson
patent: 4491794 (1985-01-01), Daley
patent: 4514687 (1985-04-01), Van Husen
patent: 4692697 (1987-09-01), Bray
patent: 4829248 (1989-05-01), Loubier
A & E Manufacturing Co., Inc.
Solis Jose M.
Wieder Kenneth A.
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