Open finder

Details Open finder Open finder

1987-10-19

1989-03-14

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

Of individual circuit component or element

324519, 324520, 324 66, G01R 2726, G01R 3104, H03K 3284

Patent

active

048127523

ABSTRACT:
A circuit tester provides an indication of open circuit faults of individual conductors in cables. An oscillator circuit in the tesster includes a capacitance as an internal part of the circuit. Test probes connect conductor pairs to the oscillator circuit, thus changing the effective capacitance of the circuit. This changes the frequency output of the oscillator in accordance with the length of the conductors. Test indications may include a low pass filter and an audio circuit, or a circuit to convert frequency to a voltage or digitalized output. The tester may be used with automated test equipment.

REFERENCES:
patent: 2603686 (1952-07-01), Lloyd
patent: 3502971 (1970-03-01), Glosek
patent: 4103225 (1978-07-01), Stephens
patent: 4173736 (1979-11-01), Adams

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