>Fun reading on 'short wires'
>
> http://www.emcesd.com/tt2001/tt010101.htm

Humph - I fair took the mickey out of a colleague who was attempting to look 
at a 5V digital signal, and couldn't see anything on the scope. His ground 
lead was about 4' of hook-up wire from the ground post on the scope front 
panel, and no ground lead at all on the probe. The picture was that swamped 
with 50Hz that there was absolutely no way he was going to see a typical 5V 
digital signal that was sub-microsecond long.

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