> Giles wrote:
> >Rodrigo,
> >Just convert the 3 pin wall plug to a 2 pin wall plug.  (lift the ground
> >pin)
>
> NO !  NO  ! NO !   THIS IS NOT THE RIGHT WAY TO DO THIS !
> Rodrigo has said he is a beginner - don't let him fry himself.
> We don't need dead PicListers - they don't contribute to the list. :-)
> Isolated probe adapters are the safe way to do these measurements.
> Some of the TEK LCD 'scopes have isolated probes IIRC.


I agree that this is bad practice - especially for a beginner who has no
idea what they are doing.
No offence meant Rodrigo BUT you really are not aware of all the factors
involved and it is quite easy to kill yourself - or someone who comes by
while you are working - if you follow this advice.

That said, I have done this on occasion - but you have to be aware that the
scope is then at mains potential and be aware of other dangers and problems
it may cause. Rather than lifting the scope ground lead, which makes it
non-standard and potentially dangerous forever, I use a "tapon" or double
adaptor type plug (tghe type which allows several appliances to plug into
the same power outlet in a large stack of plugs).
Colour this tapon BRIGHT RED. Cut off the earth pin. Place it in the power
outlet and plug the scope power plug into it.  You now have a floating
ground scope that is just waiting to kill you, your fellow workers and your
visitors and to direct main voltage into other equipment if you common its
ground with other grounds under certain conditions. Only do it if you
understand all this and control it and even then don't do it if you can help
it.



        RM

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