We looked at Arnaud's TFs taken last night on SRM and determined that there was something unhealthy in the vertical/roll, pitch directions of motion as seen by the top BOSEMs (T1, T2, T3). Travis investigated and tweeked a few seemingly non-issues:
Slightly offcenter T2, possible loose cable connections (ha!), possibl droopy C3 cover at the top. A quick look at DTT roll and vertical and these don't seem to have helped... Arnaud is looking at verifying direction of excitation motion now.
Richard found that the binary cabling was pointing incorrectly. He recabled according to spec and actuation has restored to the BOSEMs we couldn't see actuation on previously. A look at a new roll DTT TF and things look healthier.
HOWEVER - Arnaud also pointed out that the side actuation has a sign flip somehwere. Travis dug into documentation and found that the side BOSEM is mounted on the incorrect side of the suspension. We'll switch it and retake the full TF set this weekend.
Side osem actuates in the right direction, so top mass actuation is now fully functionning. Phase 2b transfer functions will be running tonight.
In fact, the SRM is supposed to have the side BOSEM mounted opposite to most othere HSTS, with an appropriate sign flip in the side coil gain, functionality is as expected.