Faulty lamp tester

Details Faulty lamp tester Faulty lamp tester

1990-08-06

1991-09-10

Wieder, Kenneth A.

Electricity: measuring and testing

Electric lamp or discharge device

Electric lamp

324403, 324515, 324530, 324556, 324133, G01R 3122

Patent

active

050477218

ABSTRACT:
A detector (42) is provided for testing a string of lamps (12) that are connected to a wire (14) in a series configuration. The detector (42) has a probe (44) disposed on the end thereof with a cavity (56) formed therein. The cavity (56) is operable to be disposed around the socket (30) of lamp (12). The electrodes (34) and (36) disposed in the interior of the socket (30) are disposed parallel to two electrodes (60) and (62) that are embedded in the probe (44). A detector circuit is provided for detecting the presence of an AC signal capacitively coupled from one of the electrodes (34) and (36) to one of the capacitive plates (60) and (62), respectively. A large DC signal will be present for a defective bulb having at least one of the electrodes (34) or (36) connected to one side of an AC supply (18).

REFERENCES:
patent: 1745419 (1930-02-01), Henneberger
patent: 2461962 (1949-02-01), Carlson
patent: 2503677 (1950-04-01), McHenry
patent: 2907949 (1959-10-01), Rogers et al.
patent: 4052665 (1977-10-01), Gruenwald
patent: 4617519 (1986-10-01), Rosenthal

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