Transfer functions of the lower stages of PR3 (HAM2) have been measured over the week end, with the sus undamped and the ISI damped.

M2-M2 tfs are showing good agreement with model and previous measurements (except for unexpected resonance at 0.97Hz in the L-L tf)
M3-M3 L-L is ok. P-P has a factor of 4 discrepancy with the model (similar pb as with SR3, which I thought I fixed but apparently not. I resaved a safe.snap with corrected EUL2OSEM matrix). Y-Y shows signs of couplings.

To note : The amplitude of excitation was too large, since the dac saturated for both M2 and M3 measurements (cf screenshot). I modified the drive parameters file "/ligo/svncommon/SusSVN/sus/trunk/Common/MatlabTools/SchroederPhaseTools/TFSettingsLHOHLTS", which should have correct gains from now.

The results are presented in the attachments :

1. H1 PR3 M2-M2 undamped tfs (green) compared with the model (blue)
2. H1 PR3 M2-M2 undamped tfs (pink) compared with undamped tf (in vacuum) from July last year (orange)
3. H1 PR3 M3-M3 undamped tfs (green) compared with model (blue)
4. H1 PR3 M3-M3 undamped tfs (pink) compared with H1 SR3 (cyan) (in chamber, in air, ISI locked) and L1 SR3 (in chamber, under vacuum, ISI isolated)

Data, scripts and safe.snap were commited under the svn