From: Robert Baer
X-Mailer: Mozilla 4.75 [en] (Win98; U)
Subject: Re: Best insulator?
Date: Sun, 08 Sep 2002 07:30:16 GMT
NNTP-Posting-Date: Sun, 08 Sep 2002 00:30:16 PDT
Organization: EarthLink Inc. -- http://www.EarthLink.net
> I need to apply 500v to one lead of a twisted pair, relative to the other.
> The two leads are connected to two connectors mounted on a Tufnel base that
> I can't change. At the moment, I'm using Nylon 6 stand-offs from the base to
> the connectors. The assembly leaks 1nA which is greater than the 0.01nA
> leakage that I require. A PTFE washer might do the trick.
> "Ian Stirling" wrote in message
> > sally wrote:
> > > Thanks for the info. Are mylar stand-offs, screws, washers etc
> > > and how easy is mylar to drill and machine?
> > > Sally
> > I don't think mylar screws are readily available.
> > Nylon, and to some extent PTFE are.
> > What do you want to insulate, and how much?
> > There may be other solutions.
> > --
> > http://inquisitor.i.am/ | mailto:firstname.lastname@example.org | Ian
> > ---------------------------+-------------------------+--------------------
> > Money is a powerful aphrodisiac, but flowers work almost as well.
> > -- Robert A
In that case, teflon standoffs and teflon insulated wires would seem
to be the best solution.
It would help if the HI lead was a coax cable, with the shield driven
by the signal on the inner conductor, using a voltage follower.
One could get down to the femtoamp leakage region with the proper
voltage follower (obviously not off the shelf).