Re: Oscilloscope grounding question...

On Fri, 25 Apr 2008 13:09:06 -0700 (PDT), "J.A. Legris"
<jalegris@xxxxxxxxxxxx> wrote:

On Apr 25, 8:34 am, Jim Yanik <jya...@xxxxxxxxx> wrote:
"Paul Hovnanian P.E." <p...@xxxxxxxxxxxxx> wrote innews:481170D7.DCC8885C@xxxxxxxxxxxxx:



Phil Allison wrote:

<seegoo...@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.


http://www.tek.com/Measurement/App_Notes/Technical_Briefs/tds3000-flo...

From '77 to '87 I was using a TEK accessory set of probes that
provided high voltage isolation between DUT and scope, so grounds were
never an issue.

I also had a wall-mounted, hit-it-with-your-palm, panic button which
would disconnect ALL power to the lab, if an emergency arose ;-)

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
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