> You can get a good idea of the vacuum by just grabbing
> the drive mechanism and seeing you can pull it straight
> out. The same as reducing the capacitance but without
> turning the screw. A bad vacuum will be easy to pull--
> only a couple of pounds of force max. A good cap will
> require 30 or 40 pounds of force depending on the surface
> area of the bellows.
It will depend on the cross-section area of the shaft. (Think about it).
Anyway, 95 percent of atmospheric pressure is hardly a vacuum at all!
Bert, VE3QAA
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