On Wed, 30 Nov 2011 07:48:46 -0800 (PST), pfm wrote:

Many advocate the use of an isolating transformer. The oscilloscope
probe and ground are then used like multimeter leads. Tektronix and
others maintain this is a dangerous practice and may result in
cumulative damage to the oscilloscope. Differential probes are one
answer, though quite expensive.

Comments please. Thanks

BobH

Don't isolate the scope; instead power the unit under test through a
isolation transformer.

PlainBill