Hand held testing device for indicating an electric test voltage

Details Hand held testing device for indicating an electric test voltage Hand held testing device for indicating an electric test voltage

1979-10-22

1981-11-17

Karlsen, Ernest F.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Using radiant energy

324103P, 324122, G01R 1302, G01R 1916

Patent

active

043014070

ABSTRACT:
There is disclosed a hand-held testing device for indicating different values of an electric test voltage. The testing device comprises at least one grip body adapted to be held in the hand and an electric circuit arranged therein. The grip body has a testing tip forming an input connecting point of the electric circuit adapted for receiving a test voltage and has a ground connection. The voltage divider connected between the connecting point and the ground connection has at least two ohmic resistors connected in series via a respective connector tap. Furthermore, the electric circuit has a plurality of display stages, each stage being connected to a respective connector tap of the voltage divider. Each display stage has a two-state amplifying element responsive to the voltage at the respective connector tap and has an optical display element indicating the presence of a given test voltage which is received at the connecting point. The display stages are interconnected by the outputs of the amplifying elements, such that only the amplifying element of the display stage which corresponds to the value of the given test voltage is switched on.

REFERENCES:
patent: 3555420 (1971-01-01), Schwartz
patent: 3818495 (1974-06-01), Sagara et al.
patent: 4004220 (1977-01-01), Kerber et al.
patent: 4006412 (1977-02-01), Campbell et al.
patent: 4017796 (1977-04-01), Tobias
patent: 4027236 (1977-05-01), Stewart
patent: 4206404 (1980-06-01), DuBois
"Car Ammeter", Elektor, vol. 4, No. 7 & 8, 1978, p. 79.
Snyder, R. A., "Simple Polarity . . . ", Electronic Design News, vol. 22, Nov. 5, 1977, p. 110.

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