![]() This tool will calculate the permeability of a toroidal type core when the following values are entered by the user: three critical mechanical dimensions (outer diameter, inner diameter, part height), the number of passes through the aperture of the core, and the measured series inductance of the wound core. ![]() To evaluate the permeability, you will need insulated wire and some way to measure inductance with a 10kHz sinusoidal signal (in a pinch 1kHz-100kHz will yield a similar number for most materials). Calculating the initial permeability on the sample in question is the most reliable way to get an approximation of its material grade. ![]() This is the inductive portion of the complex permeability of a material measured specifically at 10kHz with a flux density of less than 10 gauss (sinusoidal excitation). ![]() The main characteristic differentiating Fair-Rite’s material grades is initial permeability. ![]()
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