Batteryless ohmmeter

Details Batteryless ohmmeter Batteryless ohmmeter

1977-03-04

1978-05-09

Krawczewicz, Stanley T.

Electricity: measuring and testing

Conductor identification or location

Inaccessible

320 1, G01R 2702

Patent

active

040889491

ABSTRACT:
An ohmmeter and circuit therefor which does not require an internal battery or a continuing coupling to an external voltage source during normal use, with the necessary operating electrical power supplied through a high capacity capacitor which, after initial energization by a temporary connection to an external voltage source, develops a stored source of operating power. As the operating current is constant, there is no necessity for scale adjustment prior to each use of the ohmmeter.

REFERENCES:
patent: 2455543 (1948-12-01), Williams
patent: 2841716 (1958-07-01), Rich
patent: 2980799 (1961-04-01), Bongrain et al.
patent: 2995704 (1961-08-01), Norgaard
patent: 3222523 (1965-12-01), Kowalski
patent: 3284707 (1966-11-01), Clinton
patent: 3328685 (1967-06-01), Hewlett
patent: 3491293 (1970-01-01), Seaborn, Jr.
patent: 3636440 (1972-01-01), Stanford
patent: 3811123 (1974-05-01), Hamm et al.

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