I think if your manager, uses an Oscilloscope in such a way, that he is frying boards. Then i cant honestly see the company being around long can you? So you have access to a bench meter, i mentioned this i think, but you are deciding to track down shorts, with 2 wire not 4 wire? why is this Billy?
We have 4 bench meters here, all older but very capable machine, 2 are 6 1/2 digit 2 are 5 1/2 digit. On them, and many others like them there are 5 terminals for Ohms. We happen to have kelvin leads but obviously you dont have to. So forget the guard terminal for now, 2 terminals take the reading two terminals supply the constant I. The reading on auto Ohms range should with nice sharp probes, and a careful approach, get you to within less than 1/2 inch of a short no problem.
So what reason can you give for using 2 wire? It cannot be speed, you are under no time pressure, you can spend all day and, sometimes more, trouble shooting one board.
Let's take a look at that first. Your manager probes a (i assume non working board) with an Oscilloscope, why is he doing this? Is he meant to be trouble shooting? Because you know what Billy, that dose not add up to me, if he is probing the board then why pass it to you? He is aware he know's far more than you, afteral he has to tell you how to use a DMM. So why would that person then hand you a board they cant find a fault on?
Why would this person, who apparently know's what he is doing, get you to pull 40 chips (thats alot of chip for a motor control board, let me guess...they are all FPGA's), when this person suspects you have a short and is aware there is access to a bench meter that will read sub milli ohm?
Then you end with the classic Billy tactic............thread is dead so steer onto another topic floating scopes (sorry i mean floating the scope ground).
I can answer that question for you. Search this site. There is a huge amount of information and professional opinion on floating scopes, as you are very much aware, that is a topic sure to fire up a debate and get polarized opinion. It has been done to death here Billy, try another path
And no i am not expecting you to answer a single question i have asked, how can you answer any of them? it would take you too long to come up with a logical answer to most of them
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