Today I processed the data from the lower stage transfer functions taken few weeks ago on the 3 MC suspensions.

Attached are the plots showing respectively M2 to M2 and M3 to M3 Phase 3b DTT undamped transfer functions for MC1 MC2 and MC3.

Measurements are consistent with the models (blue curves). Only MC2 M2-M2 and M3-M3 pitch show a small discrepancy at around .85Hz, frequency that corresponds to the first vertical mode. 

*Measurement and data processing details*

dtt templates are saved and commited under :

/ligo/svncommon/SusSVN/sus/trunk/HSTS/H1/${susID}/${sagLevel}/Data/${date}_H1SUSMC1_M2_WhiteNoise_${DOF}_0p01to50Hz.xml

mat results files are saved and commited under :

/ligo/svncommon/SusSVN/sus/trunk/HSTS/H1/${susID}/${sagLevel}/Results/${date}_H1SUS${susID}_${sagLevel}

During the process, a function called "calib_hsts.m" has been created under /ligo/svncommon/SusSVN/sus/trunk/HSTS/Common/MatlabTools and is being used in plotHSTS_dtttfs_${M1/2/3}.m, since the calibration of the second stage of MC2 is different than MC1 and MC3 (different coil driver).

the function defines the DC scaling factor to calibrate data with inputs :

susID ('MC1','MC2','MC3',...)

level ('M1','M2','M3') 

is sensor input filter engaged ? ('true','false')