🚀 go-pugleaf

In article <jim.703295980@st-michael> jim@cs.UAlberta.CA (Jim Easton) writes:

   Off hand I would say this is not too practical for you unless you want
   to generate a beam.  The second method involved what we called a
   "generating voltmeter".  This was plate mounted inside the tank 
   facing the terminal.  There was a grounded chopper plate rotating
   in front of it so an AC signal was generated on the plate the amplitude
   of which is proportional to the terminal voltage.  Calibrating this
   voltameter was easy (for us) - we calibrated it from the analysing
   magnet.


To lightning research types this instrument is known as the field
mill. It is a cleaver way of integrating a chopper circuit into the sensor.
It is also used in industry to measure man-made electric field
potentials -- they are used on military helicopters with a high votage
transformer to get the potential of the helicopter equal to the
ground to null-out static buildup. I have seen military surplus units.


Regards,
Albert Boulanger
aboulanger@bbn.com