Relay checking device

Details Relay checking device Relay checking device

1991-03-26

1992-07-28

Wieder, Kenneth A.

Electricity: measuring and testing

Electromechanical switching device

Relay

324121R, 324418, 324423, 340644, G01R 3132, G01R 3102

Patent

active

051343754

ABSTRACT:
A relay device having a relay element mounted on a circuit board, the relay element having a pair of contacts which are closed and electrically conducted by a control signal of a first level and opened by the control signal of a second level to form a contact gap; an LED for emitting light toward the contact gap; a phototransistor for receiving light from the LED, the phototransistor not receiving the light while the pair of contacts are closed, and receiving the light passing through the contact gap while the pair of contacts are opened; and a checker circuit for checking if the relay device operates normally or abnormally in accordance with the relationship between an output from the phototransistor and the level of the control signal.

REFERENCES:
patent: 4147977 (1979-04-01), Dimmick
patent: 4479117 (1984-10-01), Marquardt
Heilweil et al., "Testing Electromagnetic Switching Devices", IBM Technical Disclosure Bulletin, vol. 9, No. 4, Sep. 1966, p. 367.

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