I still don't understand why you are claiming this and I know how they work. You have to understand what you are doing in the first place plus understand your test equipment. I used to use HP / Motorola / IFR service monitors, along with a few other pieces. I don't remember how to fully utilize them anymore, but I did then. If you don't understand what "could be" happening in a circuit, how can you understand what yet another piece of test equipment is trying to say?
