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Re: (Fwd: secondary waveforms)
Hi Skip, all,
Interesting observations....
<snip>
> The current waveforms look great....now. Just like they are supposed to.
> On top of looking good they can tell you a lot about what's going on.
> For instance...my system was quenching on about the fifth notch due at
> least in part to the fact that the coupling was too tight (k=.25). By
> reducing the coupling I gained another 4" of discharge length and the
> gap now quenches at the third notch.
>
> More to come..
>
> Skip
Points of note: Less energy is getting to the secondary with
lower k (more lost in the gap in the process because of increased
transfer time), the new value of k may now mean that transfer occurs
in an integral number of half cycles of ring (greater peak Vout
despite greater gap loss - but this is unsubstantiated at this point),
and finally quench time is substantially altered despite absolutely
no change to the gap system. I think this is clear evidence that (a)
typical gap systems have far less control over quenchtimes than an
optimal secondary unload (energy retained in Ls controls the gap),
and (b) I think this shows that a system exhibiting this
characteristic must be considered coupled during secondary discharge
(until the gap has extinguished).
Being able to monitor Is means that you should be able to
position a discharge rod to achieve the optimum output impedance
under normal running conditions as opposed to single shot running.
If you do, I would be most interested to hear your observations.
Malcolm