Re: Oscilloscope grounding question...

Jim Yanik wrote:

"Paul Hovnanian P.E." <paul@xxxxxxxxxxxxx> wrote in
news:481170D7.DCC8885C@xxxxxxxxxxxxx:

Phil Allison wrote:

<seegoon99@xxxxxxxxx

Running your mains powered test equipment (ie: scope) though an
isolation transformer would probably be a good idea.

** They all have one of them inside already !!!

YOU ASININE FUCKWIT MORON !!!

... Phil

My Tektronix 'scope chassis is tied to the AC supply ground. Since I'm
not always certain of how the unit under test is wired, I always check
voltage differences before connecting it.


You want to isolate the DUT,not the scope.
That way,the scope chassis stays grounded,and you don't get fried if you or
someone else lays their hand on the scope case.

TEK used to print a nice booklet on isolation measurement techniques and
do's and don'ts.I used to include one with every scope I serviced that had
the ground pin removed,after replacing the power cord[mandatory].
TEK also made some nice isolated probes.

That's a better approach, if you can do it.

It depends on what sort of DUT you are working with. If I'm poking
around in the metering/protection circuits of a BPA substation, odds are
that I don't have a suitable isolation transformer sized for that
application handy. :-)

--
Jim Yanik
jyanik
at
kua.net

--
Paul Hovnanian paul@xxxxxxxxxxxxx
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