From: "Terrell W. Fritz"
Date: Sat, 21 Oct 2000 18:55:12 -0600
Subject: Re: [TSSP] New Secondary Voltage Profiling Instrument
Hi Richard, Been a long time, always good to here from you :-)) At 12:10 PM 10/21/2000 +0100, you wrote: >Terry > >Basically it's an electrophorus ...nice idea ... you've already spotted the >problems that might occur such as droop. I wonder if local ionisation will >allow the charge on the capacitor to bleed away before you get chance to >sample it on a high Z meter. If the coil is simply driven by a signal generator, the voltages are too low to go far. I was orginally thinking of capacitve coupling to the coil but the diode would never turn on (revision 1). Tonight's testing seems to indicate the method works very well. On an operating coil, as you pull the probe away, it will draw and arc and things my be quite nasty. Perhaps the coil could be turned on and then back off for the reading without moving the probe to avoid pulling it through powerful fields, streamers, and such ;-) > >Similar things have been done by using Toepfler profilers: methods of >determining electric field distributions using needles suspended on threads, >that sort of thing. Also, peope have wired various neon bulbs into coils in >crude attempts to visualise things, something I have never tried but maybe >others have had a go at. That is fun but the results are not at all clear. And of course, there are no hard numbers to play with. > >I don't think anyone has tried this sampling approach, either, so it'll be >great to see what happens. Oh good! I was worried that everyone would come back with "Wysock did that back in 64"... :-)) Always fun to stumble on something like this and find it is truly new and useful. It is hard to find new things after 100+ years of everyone else trying! So far it seems to be working extremely well! Cheers, Terry > > >Richard > > > >> Hi All, >> >> After a four redesigns, testing, great thoughts, and many hours work... I >> think I have come up with an instrument that will basically read off the >> secondary coil's voltage profile >
Maintainer Paul Nicholson, paul@abelian.demon.co.uk.