5 Feb
2015
5 Feb
'15
12:19 p.m.
That amounts to a differential (rather than single-ended) input, and I
would consider that the _right_ way to do it. But, of course, that
costs, and single-ended is plenty good enough for most purposes, so
that's what most scopes do. :-(
Even when a 'scope has true differential inputs the common-mode range
may not be large enough to include mains.
-tony