Re: Measuring self-capacitance directly (Re: flat secondary)

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Original poster: "Malcolm Watts by way of Terry Fritz <twftesla-at-qwest-dot-net>" <m.j.watts-at-massey.ac.nz>

Hi Marc,

On 24 Feb 2002, at 22:34, Tesla list wrote:

> Original poster: "Metlicka Marc by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <mystuffs-at-orwell-dot-net>
> 
> Antonio wrote:
>  How are you measuring the self-capacitance?
> 
> 
> Hello Antonio,
> I have found that i get the best readings with the coil placed directly
> on my ground grid placed on the floor, I connect one lead to one wire of
> the coil (base or top) and connect the other to the grid. The grid is
> not connected to external ground, just the meter. For the flat coil i
> placed it on a teflon ring that i have to allow some space and connected
> the same. I use twisted pair wire for the leads of my gen rad cap bridge
> and this gives the best results.

Am I to understand that during measurement, the coil is located 
really close to a ground plane of sorts? Unless I'm mistaken, you'll 
be measuring the capacitance of a rather large flat plate capacitor.
Could you confirm please?

Thanks,
Malcolm

> I have also found that i can get fairly accurate toploadC readings
> reading without and then with the topload in place, I first tried this
> last year while getting tssp measurements, mostly because i didn't know
> it wouldn't work? 
> I'm not quite convinced of the accuracy yet, but i seems good so far.
> Take care,
> Marc M.
> 
> 
> 
>