Testing of enclosed electromagnetic relays

Details Testing of enclosed electromagnetic relays Testing of enclosed electromagnetic relays

1979-11-05

1982-01-19

Tokar, Michael J.

Electricity: measuring and testing

Electromechanical switching device

Relay

324205, G01R 3102

Patent

active

043119611

ABSTRACT:
An apparatus for testing enclosed electromagnetic relays includes a probe displaceable into the relay enclosure to engage the movable contact thereof. The probe is associated with a force transducer and a displacement transducer which provide inputs to a circuit including microprocessor unit which operates to detect the probe force required to break contact between the movable contact and the normally closed contact and to detect the position of the probe when such break occurs and when the normally open contact is made and to calculate the contact travel from the position signals it receives. Contact over travel is also measured by applying current to the relay winding and measuring probe displacement required to re-engage the contact.

REFERENCES:
patent: 1296932 (1919-03-01), Dodge
A. H. Haller et al., "Testing Relays", Western Electric Tech. Digest, No. 44, Oct. 1976, pp. 25, 26.

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