Hi,
Is an active probe possible with a FET input op amp like the AD4717?
-Deiv
Do you mean Ada4817-1? Yes, it is possible. Look at http://welecw2000a.sourceforge.net/docs/Hardware/Aktiver_Tastkopf_mit_OPA659.pdf
ada4817 can replace opa659 there.
Another useful link is http://www.mikrocontroller.net/topic/188227