>>2952271
>reference probe of a scope

never heard of that term
and google hasnt either
which means you're a noob inventing their own terminology which means we cant rely on anything you say
but none of that actually matters
what counts is that you learned a very important lesson today:
scopes, and all other test equipment that's grounded directly, or thru shared ground wires, must never ever be connected to live voltage
to avoid that, you use isolation transformers on the unit under test, or on all the test gear