Electricity: measuring and testing – Fault detecting in electric circuits and of electric components – In vehicle wiring
Patent
1990-06-25
1991-07-09
Wieder, Kenneth A.
Electricity: measuring and testing
Fault detecting in electric circuits and of electric components
In vehicle wiring
324556, 324133, 324 725, G01R 3100
Patent
active
050309161
ABSTRACT:
An auto electric tester has been provided that is simpler in construction, easier to manufacture and can expedite the location of several electrical problems more easily than all known prior art. The tester comprises a casing, circuitry mounted within the casing, four electrical conductors extending from the casing and connected to the circuitry. The circuitry comprises a full-wave bridge rectifier connected to a first two of the conductors, a relay connected across the bridge so that current flowing in two conductors in either direction to the bridge can activate the relay, a first circuit tap made between the bridge and relay extends to a third one of the conductors and includes in series a diode and a load resistor, second and third circuit taps extend in parallel from the first circuit between said diode and said load resistor to the fourth conductor, said second circuit including in series a relay switch operated by said relay and audible indicator, said third circuit including in series a resistance and a visual indicator.
REFERENCES:
patent: 4177420 (1979-12-01), Tripp
patent: 4353026 (1982-10-01), Edwards, Jr.
Meuller Robert W.
Wieder Kenneth A.
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