Electrical installations of electric light, power, traction and industrial electrical machinery (1902)
Kennedy, Rankin, d. 1917 · Edinburgh T.C. & E.C. Jack · leaf 77
ut if we take readingsfrom full load step by step downwards the readings will be wrong.However, by making the iron plates very thin and very soft—ofthe thinnest annealed ferrotype plate—this error is not serious inan instrument to be used as an indicator in a common installation.And it is always… … readino-s before plugging out and after plugging in again is ameasure of the hysteresis error. This short circuiting plugging out and in is a method of cuttingoff current from an ammeter only, and must never be attemptedon a voltmeter. Fig. 57 illustrates the method by a diagram: C isa copper coil…
Electrical engineering · Electric power
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