Lamp failure detection apparatus

Details Lamp failure detection apparatus Lamp failure detection apparatus

1978-11-06

1980-09-09

Brigance, Gerald L.

Communications: electrical

Condition responsive indicating system

Specific condition

340642, 315135, 315136, G08B 2100

Patent

active

042220475

ABSTRACT:
A lamp failure detection arrangement includes a device for interrupting electrical energy to a lamp, and a testing device for generating a low level test signal and for supplying it during the testing interval to the lamp for test purposes without causing the lamp to provide illumination. A device responds to the test signal indicating a failure condition of the lamp for generating a failure condition signal, which can be used both to energize a standby lamp and to generate an attention-attracting signal for alerting an attendant to replace the faulty lamp.

REFERENCES:
patent: 3026448 (1962-03-01), Brown
patent: 3040243 (1962-06-01), Weiss
patent: 3197674 (1965-07-01), Hellman
patent: 3346770 (1967-10-01), Stewart
patent: 3659146 (1972-04-01), Munson
patent: 3706983 (1972-12-01), Olson et al.
patent: 3745547 (1973-07-01), Hapank
patent: 3797003 (1974-03-01), Ramshaw
patent: 3883777 (1975-05-01), Morita
patent: 3952229 (1976-04-01), Rekow
patent: 3967192 (1976-06-01), Kellogg et al.

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