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Re: toroid capacitance (fwd)
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Chip Atkinson
http://bhs.broo.k12.wv.us/homepage/chip/info.htm
--- Everyone is someone else's weirdo. ---
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---------- Forwarded message ----------
Date: Tue, 12 Nov 1996 12:23:53 +1200
From: Malcolm Watts <MALCOLM-at-directorate.wnp.ac.nz>
To: Chip-at-pupman-dot-com
Subject: Re: toroid capacitance
Hi Chip,
I'd like to add a bit to my intial reply:
> Hi Chip,
>
> > How does one measure the capacitance of a toroid? The only way I can
> > think of doing so is to measure the inductance of a secondary without the
> > toroid, and then attach the toroid and measure the frequency of
> > resonance. From this, work backwards to get C. Any other ideas?
>
> That's it really. You have to measure the capacitance in context.
>
> Malcolm
ADD: Measure the coil self-F after measuring L, then add the toroid
and measure the new F. From the first frequency you can work out the
resonator C, and from the second, you have resonator C + toroid C.
BTW, you will find that Medhurst's Cself formula will give the
resonator C to quite a high degree of accuracy.
Thanks,
Malcolm