[R-390] R 390 problem

[JMILLER1706 at cfl.rr.com]

To prevent tripping the GFI, I use an AC line isolation transformer 
(1:1), 117 VAC in, 117 VAC out.  Radio Shack web page used to have 
these at low cost, but not any more.  Here is a link:  
http://www.action-electronics.com/phciso.htm

----- Original Message -----
From: Gord Hayward <ghayward at uoguelph.ca>
Date: Wednesday, March 8, 2006 10:01 am
Subject: Re: [R-390] R 390 problem
To: R-390 at mailman.qth.net

> >  1.. Chassis is hot at 80 V AC
> 
> 
> The line filters usually have caps from each side of the line to 
> the chassis.
> This acts as a voltage divider making the chassis hot either way 
> the plug goes
> in.  I've been zapped a few times by this and have had a computer 
> interfacesmoke too.  Thats also why some trip GFIs.  Make sure you 
> have a good ground
> connected.
> 
> Cheers, Gord.
> 
> 
> -- 
> 
> Gordon L. Hayward, Ph.D., P.Eng.,
> Associate Professor, Biological Engineering,
> School of Engineering, University of Guelph,
> Guelph, Ontaro, N1G 2W1.
> 
> 
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