Continuity tester

Details Continuity tester Continuity tester

1984-04-02

1986-04-01

Krawczewicz, Stanley T.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

324 62, G01R 3108

Patent

active

045800910

ABSTRACT:
The present invention provides a continuity tester comprising a D.C. coupled amplifier for providing a voltage to a transducer through a voltage threshold means, an A.C. attenuator for providing positive feedback to the amplifier, a first resistor connected between the input and the output of the amplifier and a second resistor connected in series with the transducer between the input and the output of the amplifier, the first and second resistors providing negative feedback to the amplifier, and means for connecting a circuit to be tested in parallel across the second resistor, whereby if the impedance of the test circuit is below a predetermined value, the amplifier becomes unstable and causes the transducer to produce a signal whose frequency is dependent on the impedance of the test circuit.

REFERENCES:
patent: 3284707 (1966-11-01), Clinton
patent: 3551796 (1970-12-01), Holder et al.
patent: 3689832 (1972-09-01), Leto et al.
patent: 3758855 (1973-09-01), Meyer
patent: 3870034 (1975-03-01), James
patent: 3872384 (1975-03-01), Laass
patent: 3901214 (1975-08-01), Taaffe
patent: 4163936 (1979-08-01), Shufro

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