My USB DSO model 6022BE and probe used 10X.
To comply the subject work, I have googled and understood that, need isolation trasformer(1:1, ie, 230v/230v) to protect the PC/DSO/DUT. And it also correct if use 230/12v for 2 nos in cascading connection, ie, Mains-230-12 --12-230v.
So, my questions are:
1) Why cant use the dso on the mains without isolation trf ?
2) is 10x probe sufficient, here dso will take 23v with 10x probe. or should i use 100x?