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On Fri, Dec 31, 2021 at 04:52 PM, ebrucehunter wrote:

Looking at the manual: the P6201
input impedance declines to around the 50-ohm region by 1 GHz; so it is not of
much advantage in the upper UHF region.

That's a natural consequence of the input capacitance being 3pF. One remaining advantage of a Hi-Z probe like the P6201 is the 100 kOhm input resistance, so it won't present a significant DC load if the AC signal is offset against ground. With a Lo-Z probe, there's always the 50/500/5000 Ohm DC load on the test point.

Raymond