Using a scope

[Tom Cloud]

>> >>.... remember that the scope probe ground clip is attached
>> >>directly to the scope chassis and then to the AC ground.  Care
>> >>needs to be taken where it's attached in a circuit -- it's
>> >>NOT high Z
>> 
>> 
>That's where the isolation transformer comes in or you can break off 
>the ground tab on the mains plug so there is no return path. This is 
>not recommended by the electrical authorities though.

that's what I do (or put a 2-wire adaptor plug on the end
of the cord) -- just want to caution everyone that that puts
the scope chassis at the same joltage as wherever you hang
the probe ground clip

I *always* get rid of the grounding tab on the soldering iron,
since it can cause serious problems if you're soldering in
live circuits (which I often do) .... and don't get me started
about the hocus-pocus re static.

Tom Cloud <cloud at peaches.ph.utexas.edu>