Re: RE: weird resonance with HV cap

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Chris Estes <estescc@xxxxxxxxxxxx>




Tesla list wrote:


>Original poster: "Leigh Copp" <Leigh.Copp@xxxxxxxxxxx>
>
>Chris,
>
>As you probably know, neither your function generator, nor your
>capacitance meter are really producing enough current to simulate actual
>operating conditions. The difference between the theoretical response
>based on the cap meter reading and the measured fo may have more to do
>with the cap meter reading. The fact that the cap meter typically looks
>at a very limited range of frequency or dv/dt (depends on the kind of
>meter) to make its measurement, may skew the reading significantly on a
>capacitor with more dielectric. Your function generator probably has
>much more output current than the cap meter, and is going to be able to
>more completely polarize the dielectric in your homemade cap.
>
>I'm a bit confused - you said you had the scope -and- the generator on
>the secondary? Did you mean the gen was on the primary, and the scope on
>the secondary?
>
>Leigh

Well, first I just measured the secondary resonance. I drove the bottom
 of the secondary with one lead of the gen and grounded the other and
then probed the topload with the scope probe and I had the gen and
scope and ground wires as far away from the topload as possible to make
the capacitance as close to what the actual capacitance between the
topload and earth really is. Now I'm driving the primary with the gen
and viewing the primary on ch. 1 and probing the secondary on ch. 2. If
both circuits are matched I should see the amplitude of the primary
rise and then see a big rise in the signal from the topload. I'm going
to try some saltwater caps with some hdpe buckets I just got. I really
need to get this thing done so I won't have any excuse for not working
on my thesis. :)