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.

>Believe it or not, you will be able to check almost any voltage then.  But
>keep in mind that when you connect the ground of the probe to a circuit,
>that the entire chassis of that scope will be at that potential.
>Just a side note:
>Be careful when using different wall plugs.  I have seen a situation that
>one scope was plugged in on one wall, and we were measuring a circuit on
>another wall.  The 2 walls were wired to different legs of the 220. (US wall
>outlets are made up of 110 to ground of each leg of a 220 line)  Anyway,
>with a simple wiring mistake in one outlet of neutral and ground getting
>swapped (usually no problem)  when the probe touch the circuit, very big
>sparks flew!!

This is exactly why you don't do this sort of thing.
Regards...

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