[Boatanchors] Question for the group

J. Forster jfor at quik.com
Sun Jan 30 13:54:48 EST 2005


It's a fairly old technique to estimate the Q of a coil and look for shorted
turns. Basically you set the coil up with a capacitor (either stray or an
external C) and apply a pulse and watch the damped sine wave decay. Quantitative
measurement is tricky, but it's useful to compare known good coils with unknown
ones. Even a single shorted turn can dramatically change the display pattern. It
will also show up cracked ferrite cores.

-John

GBrown wrote:

> I have seen an O-scope used to "RING" a coil. I cant find to much on the net
> about this. Anyone ever do this with success and if so.......how?
> Regards,
> Gary...WZ1M
>





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