Re: Non-linear capacitance

• To: tesla-at-pupman-dot-com
• Subject: Re: Non-linear capacitance
• From: "Jim Lux" <jimlux-at-jpl.nasa.gov> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
• Date: Mon, 10 Jan 2000 07:11:25 -0700
• Approved: twftesla-at-uswest-dot-net
• Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

> 
> Perhaps this is because of hysteresis effects (the same effects that
> make a dielectric amplifier possible as in a recent post by Bert Pool).
> The fact that you see identical behavior with the unit immersed in
> vaseline implies that this effect appears to be coming from the HV caps
> alone. Very interesting! Apparently, having non-linear elements in a
> voltage divider chain would make accurate measurements quite a
> challenge! :^)

Which, of course, is why the pro voltage dividers (e.g. those from Ross
Engineering, and others) use high pressure gas capacitors.  Physically
small, very linear, etc...  It's bad enough trying to compensate for the
parasitic C from the construction and corona effects.

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