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Re: Measuring k
From: Malcolm Watts[SMTP:MALCOLM-at-directorate.wnp.ac.nz]
Sent: Wednesday, September 17, 1997 3:22 PM
To: tesla-at-pupman-dot-com
Subject: Re: Measuring k
Hi Julian,
> From: Julian Green[SMTP:julian-at-kbss.bt.co.uk]
> Sent: Wednesday, September 17, 1997 7:54 AM
> To: tesla-at-pupman-dot-com
> Subject: Re: Measuring k
>
> >
> > k = 1/(2 x T x Fr) where T = time taken to ringup (half a complete
> > beat hump). The formula is an approximation for the lossy case.
> >
> > Also approximate: k = (Fhi-Flo)/Fr where Fhi and Flo are the two
> > sideband responses you can see when running the primary from a signal
> > generator and monitoring the two response frequencies on a scope.
> >
> > Malcolm
>
> k = 1/(2 x T x Fr)
>
> T is time of full beat hump
> Fr is Frequency in Hz
>
> The 2x is needed to split the full beat hump in half to the point of
> full ring up voltage, and T x Fr gives the number of cycles.
Disagree.
> By observing the wave form on a scope the number of cycles needed to
> reach full ring up voltage can be counted so:
>
> 1
> --------------------------- = k
> NumberOfCyclesForFullRingup
On my large system, k is set at 0.12 or near as. Cycles to ringup =
3.5 - 4, Fr = 150kHz.
> But what is this? k = (Fhi-Flo)/Fr
See above. If you sweep the sig gen, the coupled system gives two
responses with a null at Fr. If Fr doesn't produce a null, either
something is being done wrong or the system is undercoupled re spark
production.
Malcolm