(Fwd) Re: Floating Scopes

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Malcolm Watts by way of Terry Fritz <twftesla-at-qwest-dot-net>" <m.j.watts-at-massey.ac.nz>

Hi Winston,
             An addendum to my earlier reply:

On 6 Dec 2002, at 8:38, "Tesla list" <tesla-at-pupman.co wrote:

 > Hi Winston,
 >
 > On 4 Dec 2002, at 19:27, Tesla list wrote:
 >
 > > Original poster: "Winston Krutsch by way of Terry Fritz 
<twftesla-at-qwest-dot-net>" <u236-at-earthlink-dot-net>
 > >
 > > Hi All,
 > >
 > > 	I just bought a cute little Tektronix model 321 scope.  It is rated to
 > > only 5 MHz, but that's OK, since it's battery powered, and was built
 > > before 1963 :-)).  It's all solid state, too (not sure if that's good or
 > > bad, yet).
 > >
 > > 	Anyway, I was wondering if I could stick this thing on the inside of my
 > > toroid for making topload current measurements, without letting out its
 > > smoke.  I'd then view the screen from the coil's controls via binoculars
 > > ;-)).  My gut says "no", since the scope's components use the case as a
 > > ground, and RF might make things a bit messy.  Comments???  I know I
 > > could float it at a high DC potential, but I'm not sure about RF.
 >
 > Not if the scope is mains-powered. Nothing must be outside the
 > topload if the Faraday Cage protection is to work. There will be
 > topload potential impressed across the scope's power transformer and
 > of course, the topload would be effectively shorted to ground.

I missed the fact that it is a battery scope. In that case, the
answer is yes.

My apologies.

Regards,
Malcolm