Re: Coil Self Resonant Freq/Signal generator Question

["Ed Phillips" <evp-at-pacbell-dot-net> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)]

Tesla list wrote:
> 
> Original poster: "Kennan C Herrick" <kcha1-at-juno-dot-com>
> 
> On Fri, 25 Aug 2000 16:00:41 -0600 "Tesla list" <tesla-at-pupman-dot-com>
> writes:
> > Original poster: "Ed Phillips" <evp-at-pacbell-dot-net>
> >
> > Tesla list wrote:
> > >
> > > Original poster: "Kennan C Herrick" <kcha1-at-juno-dot-com>
> > >
> > > The way I do it is with a signal generator, scope & counter:
> > Connect
> > > generator & counter together so the counter reads the generator's
> > > frequency.  From that node, drive the bottom of the coil via a
> > low-value
> > > resistor e.g. 1K.
> >
> >       That is a mighty high value!!!!!  100 ohms would be more
> > appropriate
> > and would still spoil the Q of a typical coil.  When I'm trying to
> > make
> > coil Q measurements here by the delta f / f method I use a value of
> > 1
> > ohm.
> 
> [kch]  Yeah, I'm sure you're right.  It's been a while since I've done
> it.  But I don't know if it would change the resonant frequency...and
> that's what one is after.

	If that's all you're trying to measure, you are of course correct.  I
am usually interested in the Q as well, "just for kicks".

Ed