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Re: Beginner Measurements
Tesla List wrote:
>
> > > Subject: Beginner Measurements
> > > Subject: Quick and Dirty resonance check
> > Subject: Re: Beginner Measurements
> > > Subject: Beginner Measurements
>
> >From bturner-at-apc-dot-netFri Oct 25 21:49:01 1996
> Date: Fri, 25 Oct 1996 01:40:49 -0700
> From: open_minded <bturner-at-apc-dot-net>
> To: tesla-at-pupman-dot-com
> Subject: Re: Beginner Measurements
>
> Tesla List wrote:
> >
> > > Subject: Beginner Measurements
> > > Subject: Quick and Dirty resonance check
> >
> > >From hullr-at-whitlock-dot-comThu Oct 24 22:22:23 1996
> > Date: Thu, 24 Oct 1996 10:55:52 -0700
> > From: Richard Hull <hullr-at-whitlock-dot-com>
> > To: tesla-at-pupman-dot-com
> > Subject: Re: Beginner Measurements
> >
> > Tesla List wrote:
> > >
> > > Quick and Dirty resonance check
> > >
> > > >From jparisse-at-ddlabs-dot-comWed Oct 23 21:37:51 1996
> > > Date: Wed, 23 Oct 1996 10:49:27 -0700
> > > From: "Jeff W. Parisse" <jparisse-at-ddlabs-dot-com>
> > > To: tesla-at-pupman-dot-com
> > > Subject: Beginner Measurements
> > >
> > > All,
> > >
> > > I just started using a tip from Richard Hull to measure the resonant
> > > freqs of our tesla coils and I feel as if I've discovered the "next
> > > level" (a self realization... I know you guys already know this stuff).
> > > I'll repost the tip at the bottom of my post...
> > >
> > > My questions are... Now hungry for more actual readings (instead of
> > > computer projections or forumlae) I want to know if there is a way to
> > > measure primary resonance with a VOM, Frequency Counter and Frequency
> > > Generator (old Heathkit 1Hz - 1MHz, 10V)?
> >
> > Yes, Gary Petersen had a nice article in the TCBA news some ten years
> > ago, can't remember the issue, on primary measurement. But why do it?
> > Who cares! What ever you find will definitely be incorrect!
> >
> >
> > I find the resonant frequency of my loaded resonator,...in place. Next I
> > use the standard frequency equation for caps and inductors solved for L=
> > ( .0253/(Freq squared X tank capacitance) ) This gives me the theoretical
> > tap inductance on the primary. I now use an inductance meter to locate
> > that point on the primary and then just ingore it and grab one extra full
> > turn! Fire it up.... Move tap to max spark from there. Usually optimum
> > tune is found to be from 1/2 turn to 1.5 turns more than the theoretical,
> > calculated tune point. This ultimately depends loading and geometry.
> >
> > Richard Hull, TCBOR
> >
>
> Richard -
>
> I have a question - the added 'extra' inductance from the theoretical
> lowers the frequency. That's a given. What I am wondering is that aside
> from the additional 'loading' effects on the secondary, are we dealing
> with some dI/dT stuff in the primary inductor itself? Obviously, the
> primary's magnetic field isn't going to appear instantaneously, so I am
> wondering if there are some impulse-delay factors involved.
>
> - Brent
Brent,
I would think that this di/dt factor would not be a factor in the final
frequency, but that the capacitive Ion loading would be the total
determining factor in resonator frequency shift downwards.
Richard Hull, TCBOR