'Osculation' ????
(Sorry, couldn't resist it !!!)
Tim
On Wed, 9 Sep 2020 at 00:52, fauffing via groups.io <fauffing=
[email protected]> wrote:
I believe I've narrowed the issue to the probe tip, as you've suggested.
Seems hitting it with a shot of cold air will calm the oscillation for a
short period of time. The probe tip seems to be an amplifier microcircuit
in the P6249 with 4 capacitors. The microcircuit had some red/rust color
material on the traces, and I am leaning to corrosion as a potential
contributor to the problem. Capacitors or microchip degradation may also be
contributors. The tip is very well contained within the housing, and easily
destroyed in attempting removal. There is a small, maybe 1/8" hole in the
housing covered by a piece of tape. The traces of the circuit can be
accessed at this point, with the remainder of the microcircuit well
contained in the housing. It does not seem to be easily repairable. I have
not been able to make further progress, and am not willing to sacrifice my
remaining two probes, as even with the osculation, they are usable at
higher frequencies.
