Electronics > Beginners

Power Supply, isolation?

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MichaelNL:
Since we're talking scope probing now: please help me clear up some confusion in my mind.

If I connect a DUT to an isolation transformer and use only one probe of my scope it's not possible to short something out via the scope, right?

And if I were to use two probes in the same situation but remove the ground lead from the second probe (so that the ground of the scope is connected to only one point in the DUT) there's also no way to short something out. Is that assumption correct too?

Zero999:

--- Quote from: MichaelNL on November 06, 2018, 11:26:13 am ---Since we're talking scope probing now: please help me clear up some confusion in my mind.

If I connect a DUT to an isolation transformer and use only one probe of my scope it's not possible to short something out via the scope, right?

And if I were to use two probes in the same situation but remove the ground lead from the second probe (so that the ground of the scope is connected to only one point in the DUT) there's also no way to short something out. Is that assumption correct too?

--- End quote ---
If only one ground clip is connected or they're both connected to the same point, then you should be safe.

Beware that with the device connected to an isolation transformer and the secondary being earthed via the 'scope, the circuit is now referenced to mains earth and you lose the protection of any upstream RCD/GFCI.

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