Help with ICL power supply fault (Farnell SMPS)

[Tony Duell]

> If you don't mind losing your second channel, you can always apply one input 
> to channel A and the ground reference to channel B, then set the scope to 
> "A-B" mode (ChA subtract ChB). Most scopes can do this, and this is exactly 
> what it's meant for.

If you do this, make sure the 'scope can stand a 'common mode voltage' of 
a few hundred volts, because that's what it's going to be seeing. I would 
think a fair number of 'scopes will not be happy looking at a signal of a 
few volts (so the Y attenuators are set to, perhaps, 1V/cm) with a common 
mode voltage of the full mains.

-tony