Combined continuity and voltage test instrument

Details Combined continuity and voltage test instrument Combined continuity and voltage test instrument

1978-10-10

1980-09-30

Tokar, Michael J.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Nonquantitative

324 51, 324122, G01R 1914

Patent

active

042258170

ABSTRACT:
An electrical testing device comprising two circuit legs connected in parallel to a pair of test probes. The first circuit leg is primarily for indicating continuity and includes a battery in series with a current limiting resister, a diode, and a sounding device across which is connected a zener diode for protection purposes. A second circuit leg includes a resistive voltage divider in series with a zener diode with, in a preferred form, a neon indicator light connected in parallel to all but one of the resisters in the divider network. The functioning of the circuitry as a voltage indicator or a continuity indicator is dependant solely on the nature of the circuit to which the probes are connected.

REFERENCES:
patent: 3416074 (1968-12-01), Schoonover
patent: 3546587 (1970-12-01), Turecek
patent: 3614610 (1971-10-01), Legatti
patent: 3786468 (1974-01-01), Moffitt
patent: 3831089 (1974-08-01), Pearce
patent: 3872384 (1975-03-01), Laass
patent: 3962630 (1976-06-01), Chaffee
patent: 4015201 (1977-03-01), Chaffee
patent: 4027236 (1977-05-01), Stewart

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