Laboratory and Factory Tests: In Electrical Engineering (Classic Reprint) - Softcover

Excerpt from Laboratory and Factory Tests: In Electrical Engineering

Instruments should not be used in close proximity to dynamos, motors or conductors carrying large currents, for readings are affected by magnetic leakage from these sources, and the steel magnets in the instruments are liable to be permanently changed. A certain method of detecting this trouble is to note whether the instrument reads the same when it is turned around into different angular positions.

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