Lower stages transfer functions of HAM3 suspensions (MC2 - PR2) succesfully completed over the week end and were processed today. They match very well model and previous measurements. One interesting feature is worth noticing though : the M3-M3 tfs of PR2 (Long Pitch and Yaw) (see 4th attachment) shows a high Q resonance at 45Hz, which is certainly not mechanical, but might be related to the 'turn-up' seen with other osems.
A quick dtt tf was taken, driving the L channel, confirming the presence of the feature. It also shows up with coil driver in state 1 and state 2. The attached dtt screenshot shows that the feature comes from the LR channel. More investigation will be done tomorrow.

The tfs results are presented in the attachments as follow :

1. H1 MC2 M2-M2 undamped tfs compared with model
2. H1 MC2 M3-M3 undamped tfs compared with model
3. H1 PR2 M2-M2 undamped tfs compared with model
4. H1 PR2 M3-M3 undamped tfs compared with model
5. H1 PR2 / MC2 M2-M2 tfs compared with previous in chamber, in vacuum measurements
6. H1 PR2 / MC2 M3-M3 tfs compared with previous in chamber, in vacuum measurements

Data and scripts were commited to the svn