Testing device for detecting contact chatter in electrical compo

Details Testing device for detecting contact chatter in electrical compo Testing device for detecting contact chatter in electrical compo

1985-06-05

1987-08-11

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Electromechanical switching device

Relay

340644, G01R 3112, G01R 3102, G08B 2100

Patent

active

046864784

ABSTRACT:
A contact chatter detector includes a bipolar power supply and a switching system which permits the fixed contacts of a relay under test to be connected either to the positive or the negative terminal of the power supply, the movable contacts of the relay under test being grounded. Depending upon the switch position and whether or not chatter is present, the fixed contacts may be at ground potential, a positive potential, or a negative potential. Binary gates continuously monitor the fixed contacts, and are able to accommodate the three input states by receiving power from power supply translation circuits which effectively adjust the gates to be responsive to the negative potential and ground at one switch position and to ground and the positive potential at another switch position. Interruption alarms connected to the gates determine whether chatter exceeds a predetermined minimum, regardless of the rate at which the chatter pulses occur. The contact chatter detector can easily be expanded to permit testing of more than one relay simultaneously.

REFERENCES:
patent: 3355660 (1967-11-01), Drazic
patent: 3364419 (1968-01-01), Anderson
patent: 3648233 (1972-03-01), Clark
patent: 3872473 (1975-03-01), Melgaard et al.
patent: 3993949 (1976-11-01), Magno et al.
patent: 4173735 (1979-11-01), Merchant
West, "Contact Bounce Tester", IBM Technical Disclosure Bulletin, vol. 20, No. 3, 1977, pp. 1081-1082.

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