Ibrahim, Oli

Attached are the most recent (07-10-2024) BBSS Transfer Functions following the most recent RAL visit and rebuild. The Diaggui screenshots show the first 01-05-2024 round of measurements as a reference. The PDF shows these results with respect to expectations from the dynamical model. Here is what we think so far:

• Results are less coherent in certain orders of magnitude, namely L, P, Y.
• The percieveable roll we have not fixed in M3 does not seem to change the Roll TF measurement
• The F3 OSEM sways more than the others as a response to the TF excitations and is in general, more reactive than the others (attached gif)
• Pitch has unexpected and shifted peaks, which seem to cross couple into the other TFs
• Most percieveeable in Y, there is increased signal noise from around 1.5-6hz
• The F1, LF and RT OSEMs have drifted from their nominal centered positions (this will be a seperate alog).

Thoughts:

The nicest sounding conclusion here is that something is wrong with the F3 OSEM because it is the only OSEM and/or flag involved in L, P, Y (less coherent measurements) but not in the others; F3 fluctuates and reacts much more irratically than the others, and in Y, the F3 OSEM has the greatest proportion of actuation than P and a higher magnitude than L, so if there were something wrong with F3, we'd see it in Y the loudest. This is exactly where we see the loudest ring-up. I will take spectra and upload this in another alog. This would account for all issues but the F1, LF and RT OSEM drift, which I will plot and share in a seperate seperate alog.