By far the easiest geometry to evaluate would be a toroidal type shape though any core with a closed magnetic structure can be evaluated with a reasonably high degree of accuracy. ![]() With a bit of extra effort, a signal source along with an oscilloscope could be used. ![]() In general, an LCR meter is the optimal piece of equipment to make this measurement. 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 should be about the same for most materials). Calculating the initial permeability on the sample in question is the most reliable way to get an approximation of what material it is made of. 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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