Electricity: measuring and testing – Electromechanical switching device – Relay
Patent
1982-06-01
1985-01-01
Tokar, Michael J.
Electricity: measuring and testing
Electromechanical switching device
Relay
324 64, 324415, G01R 3102
Patent
active
044917970
ABSTRACT:
In the testing of dry circuit contacts, a constant current source is applied to the contacts. The open circuit voltage of the source is set to a predetermined maximum value and then the short circuit current at the contacts measured. If the current value is below a predetermined maximum value, the voltage of the source is increased to bring the short-circuit current to the predetermined value. The voltage drop across the contacts is then measured and the contact resistance calculated. This arrangement makes adjustments to take into account variations in the test circuit, such as different lead lengths and other variables, without subjecting the contacts at any time to an open circuit voltage or short circuit current above maximum values.
REFERENCES:
patent: 2810109 (1957-10-01), Breggin
patent: 3217243 (1965-11-01), Franklin
patent: 3510760 (1970-05-01), Hellstrom et al.
patent: 3515982 (1970-06-01), Longworth et al.
patent: 3928795 (1975-12-01), Lechner
patent: 4232262 (1980-11-01), Emo et al.
Relay Testing Procedures, Tech. Committee II Progress Report, NARM, 4/59, p. 11.
Relays, Radio Electronics, 1/62, pp. 46-48.
Relay Testing, Electrical Review, 2/46 pp. 293-295.
Jelly Sidney T.
Northern Telecom Limited
Tokar Michael J.
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