Portable digital ohmmeter

Details Portable digital ohmmeter Portable digital ohmmeter

1976-11-10

1978-08-01

Tokar, M.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

324 62, 324 64, 324 65CR, 324140R, G01R 3102

Patent

active

041045785

ABSTRACT:
A portable ohmmeter for use in measuring the resistance of an electrical contact including a direct current battery, and a resistive element serially connected with the contact and the battery to form a complete circuit. Included are means for sensing the voltage drop across both the resistive element and the contact, and a digital ratiometer for displaying the value of the resistance of the electrical contact. The digital ratiometer displays the ratio of the voltage drop across the contact to the voltage drop across the resistive element, which ratio is also the value of the resistance of the contact. Also included are means for calibrating the ratiometer as a function of the resistance of the resistive element.

REFERENCES:
patent: 2461425 (1949-02-01), Kelly
patent: 3382430 (1968-05-01), Cunniff

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