An experimental study of the Koepsel permeameter (1914)
National Bureau of Standards · leaf 7
s it should be thoroughly de-magnetized. Residual induction in the bar or yokes will cause adeflection of the instrument even when no magnetizing currentis flowing. It is very difficult to reduce this residual deflectionto zero, but it should be made quite small, not over a few hundredgausses. To… … Fig. 2.—Photograph of the Koepsel permcameter used in this investigation The Koepsel Permeameter 105 deflected position) it is necessary to take readings on both sides ofthe zero point. This may be done by reversing either the auxiliaryor the magnetizing current, preferably the latter, since in…
Magnetism · measurements and use of instruments/ B8000 Power systems and applications
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