Calculating characteristics of an unknown ferrite toroid:
Often radio-enthusiast can found in his spare box some unknown ferrite toroid core. However, he don't knows anything about its characteristics, he don't know the AL – the inductance factor or µ – the initial permrabiluity 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:
– Number of turns
– Measured inductance
– Outer diameter of ring
– Inner diameter of ring
– Height of ring
– Initial magnetic permeability
– Inductance factor of the core [nH/N2]
The Ring_permeability plugin in Coil32 software allows to solve the same problem.
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