[time-nuts] Capacitive temperature sensing

[Mike Monett]

  "Mike Monett" <XDE-L2G3 at myamail.com> wrote:

  [...]

  >  Gentlemen,

  > The problem  is very simple. If the sensor lead that  contacts the
  > mercury has a diameter of 0.010 inch, with a flat end, and  is 100
  > microinches away from the mercury, the capacitance is 0.35 pf.

  Sorry, I  used  a bad formula for the area of a  circle.  The actual
  capacitance is  0.1767 pF, still well within the  capability  of the
  AD7747.

  Regards,

  Mike Monett