I am working with an instrument which has a supply of 230V AC or 400V DC. AC source is isolated at the input via 1:1 transformer and DC source is a floating supply.
I have a Yokogowa DL1620 oscilloscope. The power cord of scope does not have an earth pin. So my question is: I know unit under test shall be isolated always as I done however, can I work on an isolated unit with unearthed scope?
Also if scope is earthed then "ground" of unit under test will be at 0V. Is it desirable?