Identifying ferrite materials #2

A correspondent wrote about Identifying ferrite materials asking how to use the method on an analyser that does not display X, but displays R and |Z|.

The method described calls for making a winding of the least number of turns for which measurement can reasonably be made, and finding the lowest frequency where R=X.

If your analyser does not display X (or |X|), you can exploit the relationship that |Z|=(R^2+X^2)^0.5. When R=X, |Z|=1.414R… so you would look for the lowest frequency where |Z|=1.414R.

Having found that, compare it with the table given or datasheet graphs to find candidate mixes.