Well if he knew the relation between PSD and close-in phase noise and that the routine measurement for PSD is spectrum analyser ...
Another Chinese proverb:
Study without reflection is a waste of time.
Reflection without study is dangerous.
http://www.computeraudiophile.com/f30-abbingdon-music-research-ifi-audio-sponsored/measuring-ipower-much-ado-about-nothing-part-4-uploaded-and-complete-28982/#post558122
If you have to add an isolation transformer, you better hire your favourite Jazz band to play in your living room it will...