I'm trying to measure the leakage current along an insulator energize with HVDC (the effect of space charges is been considered).

-          Can I connect a picoammeter to the ground electrode? If yes, please how do I protect the picoammeter so as not to damage it?

Or

-          Can I connect a voltage divider (with 5kohms and 50ohms connected in series) at the ground electrode, measure the voltage across the 50ohms with a picoscope and from there I can use V=IR to get my current? If yes, please how do I protect the picoscope from getting damaged?

Thanks.

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