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Jan 29, 2018 at 20:34 comment added David1 Thanks EE_socal. That makes sense, but just to check I understand properly: the scope probe ground is connected to mains supply earth; the power supply has a choice of mains supply earth or "COM" (not earthed); and the function generator ground is also not earthed. Having watched EEVblog #279 - How NOT To Blow Up Your Oscilloscope! <youtube.com/watch?v=xaELqAo4kkQ> I think it's all right to connect these together but just wanted to check.
Jan 29, 2018 at 20:25 history answered EE_socal CC BY-SA 3.0