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Re: 600kV voltmeter

Original poster: "Dr. Resonance" <resonance@xxxxxxxxxx>

This is a very interesting point Bert and I don't have the answer. I just know that our measurements were in very close agreement with Terry's planar antenna measurements on our Tek storage scope and also in close agreement with the inductance ratio equation. We used 70% --- a value to adjust downward to fit the plotted curve.

Dr. Resonance

> >
> >This procedure has always been shrouded in mystery and overlooked by most
> >modern physics textbooks, but it's an easy procedure.
> >The easiest way to measure the sec output is to put a string of diodes in
> >the HV power supply with a large resistance --- say 5-10 megOhms.  This
> >charge the cap slowly and the sparkgap fires once every 5-10 seconds (5RC
> >time constant to full charge).
> >This spark length is measured from the toroid to a 7-12 inch ground
> >terminal.  It may then be compared with the peak DC potential charts in
> >Handbook of Chemistry & Physics.  Use the standard impulse generator
> >for best accuracy.
> >This method has long been overlooked by experimenters but is possible
> >because the sparklength in a single shot mode is completely independent
> >the waveform (Abbdulah's book on HV Engineering).
> ><Snip>
> Hmm... I wonder if the above assumption is really true for increasing
> amplitude oscillatory RF waveforms seen during secondary ringup. To my
> knowledge, this case is not covered anywhere in the literature. Most most
> research involves 50/60 Hz, dual exponential unipolar impulses (1/50 usec,
> etc), DC, or at best oscillatory discharges superimposed on dual
> exponential waveforms to simulate utility switching transients.
> Let's take the case where initial breakout occurs at the HV sphere at some
> voltage that is significantly lower than the ultimate peak voltage of the
> Tesla Coil. In this case, the initial streamer will form at some time
> to the completion of the first ringup, creating a hot conductive leader
> that cannot (as yet) bridge the entire gap. Wouldn't this be followed by
> further streamer growth once the terminal voltage rose to the the next
> (higher) peak? Also, once an increment of charge of one polarity has been
> injected into the surrounding region, the next voltage should help to
> further intensify the E-field seen by the streamer tips, perhaps leading
> incremental on subsequent peaks until the true peak was reached? The
> might be sparks that are still longer (for a given true peak voltage) than
> that those given in the sphere gap tables. I wonder...  :^)
> -- Bert --
> --