Now that the latest QUAD build has been completed, Yaw Diagonalization measurements were run on the M0 and R0 masses of the new quad build.  On Friday, the measurement on M0 was run which indicated less-than-ideal coupling of the F1 OSEM to Yaw.  Ideally, the isolation should be at around ~30dB for each OSEM not contributing to the Euler-based DoF. The first attached plot shows the F1 OSEM at around ~18-20dB isolated from F2 and F3, the "Yaw" OSEMs.  The measurement excitation for this measurement was a sine wave at 1.353Hz with a 100-ct amplitude.  

A slight "Roll" on the M0 mass was noticed with a bubble level after these results, and it was decided to try to correct the offset by adding shims under the M0 blade springs.  After realignment, the Yaw diagonalization measurement was run again with the same result (it is actually this measurement that is attached as the first pdf - the measurement from Friday was identical).  

A new measurement was then set up with slightly different drive parameters.  The drive frequency was changed from 1.353Hz to 1.3Hz with the same amplitude.  The second attachment is a plot of the results.  The F1 OSEM is now noticeably more isolated at this frequency with an isolation of ~28-30dB from "Yaw". Thus, the Yaw diagonalization for the M0 mass on the new quad build is now in an ideal configuration.