Along with the development of new instrumentation, the test procedure itself was also standardized. By “walking” the potential probe toward the current probe and graphing the measurements, the ...
Null balance Megger earth tester, patent number 963374, catalogue number 63220, instrument number 2038884, by Evershed and Vignoles Ltd, Acton Lane Works, Chiswick, 1950-68. Null balance Megger earth ...
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