| Definition: | the relative permeability obtained from the peak value of the magnetic flux density and the peak value of the applied magnetic field strength, at a stated amplitude of either, when the field strength is varying periodically with time and with an average of zero, and the material is initially in a specified neutralized state
NOTE 1 – Two amplitude permeabilities are in common use, namely :
i) that in which the peak values apply to the actual waveforms,
ii) that in which the peak values apply to the fundamental components, in which case it should be distinguished which of the waveforms, if either, is sinusoidal.
NOTE 2 – In the limit, X and X may be static values provided the material is in a cyclic magnetic condition.
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