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Vintage Biddle / Megger Null Balance Earth Resistance Tester - Catalog 63220
$ 15.83
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Description
Vintage Biddle / Megger Null Balance Earth Resistance TesterJames G. Biddle Co. - Plymouth Meeting, PA - Made in England
The Biddle 63220 is a Null Balance Earth Resistance Meter. It measures ground resistance using a hand-cranked oscillator with four resistance ranges adjustable from 0.01 to 9990.00 Ohms.
The 63220 measures the ground resistance by applying a test current through an earth electrode under test which returns through the soil and a remote terminal.
The potential between the earth electrode and a remote terminal potential is observed and balanced against an equal potential in the Earth Tester.
When a null condition is achieved, a read out in ohms is displayed on a meter which, under proper test procedures, is the earth electrode resistance.
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