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From: Dave Plowman (News) on 30 Dec 2009 20:20
In article <3dcg89.io8.17.11(a)news.alt.net>,
Meat Plow <meat(a)petitmorte.net> wrote:
> On Wed, 30 Dec 2009 22:23:51 +1100, "Phil Allison"
> <phil_a(a)tpg.com.au>wrote:

> >.... Phil

> Yes you do give very bad advice.

I've got no objection to anyone saying I'm wrong. Provided they back it up
with facts. Mains electricity is always dangerous. Using an isolation
transformer can *reduce* that hazard. Not *eliminate* it. And as regards
connecting a grounded mains 'scope probe etc to equipment under repair
which you've fed via an isolating transformer - words fail me. Someone
that thick that they don't understand the safety issues should stick to
playing with themselves - like Phil.

--
*Dancing is a perpendicular expression of a horizontal desire *

Dave Plowman dave(a)davenoise.co.uk London SW
To e-mail, change noise into sound.
From: Phil Allison on 30 Dec 2009 20:54

"David Nebenzahl"


** Scumbags like YOU need a bullet in the head.




..... Phil




From: sparky on 31 Dec 2009 09:26
On Dec 30, 8:20 pm, "Dave Plowman (News)" <d...(a)davenoise.co.uk>
wrote:
> In article <3dcg89.io8.17...(a)news.alt.net>,
>    Meat Plow <m...(a)petitmorte.net> wrote:
>
> > On Wed, 30 Dec 2009 22:23:51 +1100, "Phil Allison"
> > <phi...(a)tpg.com.au>wrote:
> > >....   Phil
> > Yes you do give very bad advice.
>
> I've got no objection to anyone saying I'm wrong. Provided they back it up
> with facts. Mains electricity is always dangerous. Using an isolation
> transformer can *reduce* that hazard. Not *eliminate* it. And as regards
> connecting a grounded mains 'scope probe etc to equipment under repair
> which you've fed via an isolating transformer - words fail me. Someone
> that thick that they don't understand the safety issues should stick to
> playing with themselves - like Phil.


Dave, You seem to loack a basic understanding of isolation
transformers
and service techniques. The isolation transformer allows you to
scope
probe at any part of the circuit and create a "virtual ground"
anywhere in
the circuit.
Isolation transformers do not eliminate shock hazard but are a
very usefull
tool on the service bench. If used by someone with the KNOWLEDGE
to use it.
..
..
From: Dave Plowman (News) on 31 Dec 2009 09:47
In article
<9379d4f2-0894-4d69-b253-ceec49ff6fae(a)c3g2000yqd.googlegroups.com>,
sparky <sparky12x(a)yahoo.com> wrote:
> > I've got no objection to anyone saying I'm wrong. Provided they back
> > it up with facts. Mains electricity is always dangerous. Using an
> > isolation transformer can *reduce* that hazard. Not *eliminate* it.
> > And as regards connecting a grounded mains 'scope probe etc to
> > equipment under repair which you've fed via an isolating transformer -
> > words fail me. Someone that thick that they don't understand the
> > safety issues should stick to playing with themselves - like Phil.


> Dave, You seem to loack a basic understanding of isolation
> transformers and service techniques. The isolation transformer allows
> you to scope probe at any part of the circuit and create a "virtual
> ground" anywhere in the circuit. Isolation transformers do not eliminate
> shock hazard but are a very usefull tool on the service bench. If
> used by someone with the KNOWLEDGE to use it. .

There is no reason to have the 'ground' on your scope connected to actual
ground - with a suitable 'scope. Or perhaps you ground one leg of your DVM?

You seem to lack basic understanding of safe working practices.

--
*Do paediatricians play miniature golf on Wednesdays?

Dave Plowman dave(a)davenoise.co.uk London SW
To e-mail, change noise into sound.
From: sparky on 31 Dec 2009 10:09

>
> You seem to lack basic understanding of safe working practices.
>




Have you ever worked on a piece of equipment ?

Certainly not effectively !

Certainly not safely !
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