u/BackgroundPlenty7755

Hello peeps, I’m super new to a lot of this stuff and currently building out my amp testing bench.

I’m wondering how the whole isolation transformer with an oscilloscope works.

I’m aware you have the DUT connected to the iso transformers and the scope connected outside of this (like to a regular receptacle connected to the grid)

So I understand that this set up prevents you or at least helps loop you out of any fault paths back to ground within the DUT, but once you connect the ground probe of your scope to the DUT, does that not create a pathway back to the neutral through the scope itself? I know using an iso transformer is supposed to prohibit the scope from potentially being damaged due to shorts, but if the ground probe is connected how is it not defeating the purpose of the iso transformer? Maybe I’m over complicating it, I’ve seen in videos that people will mention once you attach the ground probe, you have to be careful because the ground is now connected back so maybe the scenario of using the scope is when you would be more inclined to ensure GREATER safety verses when you’re using a multimeter and other equipment like a variac and current limiter.

Not sure if this makes sense I’m sorry I just hope someone can tell me I’m stupid and explain it to me lol