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Many 10 Mohm probes available on the market:

[URL unfurl="true"]https://www.pmk.de/files/downloads/PML%20Series%20Datasheet.pdf[/URL]


In earlier years, most 10:1 probes had 10 Mohm input R, increased bandwidth of modern passive probes often resulted in 1 Mohm.


Base node has 200 nA bias, 1 Mohm probe turns transistor off.


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