Electrical apparatus for testing voltage, polarity and continuit

Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Nonquantitative

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Details

324 51, G01R 1914, G01R 3102

Patent

active

042335604

ABSTRACT:
Electrical testing apparatus comprising a pair of input probe terminals, a multi-position mode selection switch, a source of direct voltage, an NPN transistor and a PNP transistor, and a pair of light-emitting diodes each connected in the collector-emitter circuit of a corresponding transistor and poled for conduction when the corresponding transistor is on. In one position of the switch connecting one of the input terminals to both bases of the transistors, an alternating voltage between the input terminals is indicated by both of the light-emitting diodes being energized, and a direct voltage between the input terminals is indicated by only one of the light-emitting diodes being energized, the particular one being determined by the polarity of the direct voltage. In either of two other positions of the switch connecting one of the input terminals to either of the light-emitting diodes, if a closed circuit exists between the input terminals one of the light-emitting diodes is energized depending upon the polarity, and if an open circuit exists neither diode is energized.

REFERENCES:
patent: 3553572 (1971-01-01), Harmon
patent: 3600678 (1971-08-01), Garrett
patent: 3735248 (1973-05-01), Reese
patent: 3806803 (1974-04-01), Hall
patent: 3872384 (1975-03-01), Laass
patent: 4027236 (1977-05-01), Stewart

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