Swend
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It really depends on the intended probe frequency range, which wasn't specified along this thread. The shown resistor divider primarily suffers from HV resistor parallel capacitance, which is causing large error already in the kHz frequency range. A first order compensation improves the probe function a lot, it's probably sufficient for the relative low frequency signal this thread is dealing with.
The setup in this thread looks pretty much like "my first DIY HV probe". Don't expect same performance as with calibrated professional products or other expert designs.
"my first DIY HV probe" - ;-) Actually it's my second, the first one was with a 10x10M resistors that didn't work quite well. Maybe I should run a fundme.com campaign and get me some prof equipment, or maybe I could pass the hat around on edaboard ;-)
Anyway, I gave the dividers a once-over again this morning, and I targeted 33KHz so with a 100pF across the 100K and the 100M/100K divider became 1000:1, and max frequency around the 1MHZ mark.