5 Feb
2015
5 Feb
'15
11:20 a.m.
With most
'scopes one side of the input is grounded [...]
Ah. That's the part I was
missing! I (naively :-) assumed that the
'scope's whole input amplifier would be 'floating', and the input
signal would be taken as referenced to the 'ground' on the probe,
which could itself be floating.