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Measure high Voltage 500V DC and Current in a floating system

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mjoelner:
Yes, floobydust.

Thanks for that input (to all of you really, it has been very helpfull this far). The scope can easily be grounded, so I will definately do that from now on.

I noticed the noise issues when I did the measurement, and I had a feeling it would be very noisy with such a small voltage over the resistor. This is why I decided to try the pseudodifferential method. If I grounded the scope, and used the pseudo differential method, would I also then put myself and the gear in harms way? I am starting to think I should go very low with the voltage and see where it takes me when I slowly turn it up. That might maybe give me some insight, (that some of you probably have told me allready but I did not fully understand)

I could help it a bit by using a bit bigger resistor. I have a couple, so I could potentially put a couple in series. 

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