On Dec 1, 6:25*pm, "Phil Allison" wrote:
"pfm = *bull**** artist "

Thanks. No question about the scope being grounded, no one suggested
otherwise. Tektronix maintain that floating measurements, taken in a
DUT powered by an isolating transformer, is bad practice.

** Nothing like that is in the app note YOU cited.

*In fact there is no mention of the idea at all making the app note seem
deliberately misleading.

... *Phil

Try this: http://www.tek.com/Measurement/App_N...ng/safety.html