Re: Coil Self Resonant Freq/Signal generator Question

["Kennan C Herrick" <kcha1-at-juno-dot-com> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)]

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.

> 
>  Connect the scope to the 1K:coil node.  Tune the
> > generator for a max. on the scope and read the resonant frequency 
> from
> > the counter.  ...and note how it varies when you move around the 
> coil!
> > 
> > Ken Herrick
> > 
> > On Thu, 24 Aug 2000 19:52:26 -0600 "Tesla list" <tesla-at-pupman-dot-com>
> > writes:
> > > Original poster: "Metlicka Marc" <mystuffs-at-orwell-dot-net>
> > >
> > > to all,
> > > this post came at a great time for me, see i am getting a fluke
> > > counter/tracer. i have been asking for information on reading 
> the
> > > frequency of various coils that i have and wanted to know if 
> anyone
> > > on
> > > the list has a workup for function generator, scope, counter
> > > technique's
> > > that they could post? or maybe a site for same?
> > > thank you,  marc edward metlicka.....mem
> 
> Ed
> 
> 
>