On 05/09/2011 14:40, Electron wrote:
> But then I thought: did I really need the isolation transformer? Couldn't
> I just cut the 'scope's ground wire instead?? :P
>

You should have the test gear earthed.

Earth the reference point of equipment under test (i.e. negative input=20
at bridge of SMPSU, not mains neutral).

Then connect supply via  a proper isolated transformer that has no earth.

--=20
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