On 6/16/21 12:05 PM, Jim Brown wrote:
On 6/16/2021 11:45 AM, Lux, Jim wrote:
Out of curiosity, what was the spread in apparent parameters?
I'd have to look at the spreadsheets -- it's been three years. But
because resonances are involved, f the parameters I measured, Rs, Xs,
and Zmag at a given frequency for a 10-turn winding, almost 2:1 for
some data points. With respect to fundamental properties, I'd guess
that Fair-Rite's 20% number is pretty good. But those fundamental
properties from a circuit point of view are mu' (inductance) and mu''
(loss).
There's also the dimensional tolerances on the actual cores, too. The
cross sectional area and path length. Nowhere near a 20% effect but
still, it was surprisingly large when I was doing a notional design at
work. Somewhere (perhaps from you) I heard that one of the
uncertainties is the shrinkage during the firing process, since they're
not "machined" out of a block of something.
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