At 15:15 11-11-09, Peter Dodd wrote:
Does anyone know of a method of measuring the characteristics
(permeability) of ferrite cores? I have a box of these most without
any identification although I do have T200, 68-2T and T68-2s whose
characteristics are known.
It occurs to me that you can make a tuned circuit and measure
resonance with a GDO when a ferrite core is inserted into the
inductance. A graph could be made of the different resonances with
different cores, to extrapolate the unknowns.
However I think that ferrite bulk might be a problem. For example I
guess the red T cores use the same material but would there be a
difference between the T200 and the T68?
I have lots of material about ferrites in general - I just want to
know what I have in my junk box. I am not interested in exact
measurements, I just want to know if a core is suitable for a specific job.
Regards
Peter, G3LDO
Peter,
just my 2 Eurocents... wound a few (5 to 20) turns, measure L and
take physical dimensions of the toroid, use G4FGQ's toroid.exe, and
then play with the parameters in the program to find wich
permeability gives the L you measured. The program is pretty
accurate, Reg did a nice job.
73 - Marco IK1ODO
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