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Calculating characteristics of an unknown ferrite toroid:

Often radio-enthusiast can found in his spare box some unknown ferrite toroid core. However, he doesn't know anything about its characteristics, he doesn't know the AL – the inductance factor or µ – the initial permeability of the core. So far as the magnetic flux is closed in the core and don't have an air gap, we can quite easy to estimate these values. We have to wind some turns on the core and to measure obtained inductance by using an LCR meter. The following calculator helps to determine characteristics of the toroid core. Here you can see the formulas that the calculator uses.

ENTER THE INPUT DATA:
 Select units: mm/cmmil/inch

 N = – Number of turns L = mHμHnH – Measured inductance D1 – Outer diameter of ring D2 – Inner diameter of ring h – Height of ring

RESULT:
 µ = – Initial magnetic permeability AL = – Inductance factor of the core [nH/N2]

The Ring_permeability plugin in Coil32 software allows to solve the same problem.

If you determined the magnetic permeability of the toroid core, you can calculate the number of turns for required inductance with this core.

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