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DIY Isolation transformer box

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Mr. Scram:
The fact that oscilloscope grounds are tied together and to ground cannot be stressed enough. A typical oscilloscope differs from a multimeter in that regard and this difference may not be immediately obvious. You can use active probes to create isolated inputs and there also are oscilloscopes with isolated inputs but that's generally a specially listed feature.

Zero999:

--- Quote from: MarkF on August 25, 2019, 06:05:52 pm ---
--- Quote from: queennikki1972 on August 25, 2019, 02:30:29 pm ---MarkF I read several places that you should not float your scope, rather you should float the circuit instead????

--- End quote ---

That is correct.  You could bring the chassis of your scope live if you float it.
Never float your scope or any other test equipment for that matter.
Float your Device_Under_Test (DUT) instead.
Also, watch where you connect the probe GND clips, when using more than one probe, not to short anything (Remember, they are all connected together.).

And be especially careful if you're debugging a 'switching power supply' (even with it floated).

--- End quote ---

--- Quote from: queennikki1972 on August 25, 2019, 02:30:29 pm ---MarkF I read several places that you should not float your scope, rather you should float the circuit instead????

--- End quote ---
Yes and it's generally recommended to connect the oscilloscope's chassis to earth, even if it's being run off a battery (as in the Owon SDS7102-V), although it's not always practical, as if one is not using the mains, then there's little chance they'll have access to an earth connection. The exception being a scope meter, which has a fully insulated chassis.

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