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On Mon, Nov 19, 2018 at 1:53 PM Tobias Pluess <tobias.pluess@...> wrote:

I had a bad diode in the log amp in IF section of my HP 8566B that manifested in a similar manner. See </g/HP-Agilent-Keysight-equipment/message/73067> for the thread. I have a couple of YouTube videos of the behavior mine exhibited. Here's one <>.

Key points that would have helped me isolate it at the time are:

1. Occurs in zero span at low levels for all frequencies - so not frequency dependent.

2. Does not occur in linear mode.

Good luck,

Siggi