After working on the Instrument's Host box with Robert on Tuesday, we were getting resigned to pulling this instrument as few tests remained.  Was going to swap the host box to test that as the source of the glitching as all our shenanigens got us bupkis--The 46 second glitching, the 0.02ish Hz comb, and the high noise shelf starting at 60Hz, all continued.  At least for a few hours.

Now when I look, the time series glitches all but disappeared by about 2330 utc Tuesday, see first attachment.  The second attachment is the spectra for the PEM STS and the ISI GND STS.  The reference traces are when the glitching was occurring showing the Comb and the Shelf.  So the current ADC channels don't have these features but noise floors still don't correspond with ISI GND STS: see below ~60mHz and above 10Hz.  This is the signal state a few weeks ago when Krishna looked at which time I found at least one STS mass completely misscentered.

So I propose the following at an opportunity: go measure the mass centering and other diognostics on the Host Box.  If there is anything suspicious, replace the Host Box.