Once HAM3 is balanced, and the ISI sensors and plants are checked, we'd like to take a 1mHz resolution Ry to Ry transfer function of the CRS to verify its response, and infer if the Center of Mass is below the Rotation Point. The measurement consists in driving Ry of the ISI and normalizing the CRS response to the Ry drive with the CPS response to that same drive (which is flat in the 1mHz - 1Hz region)

A template for this measurement was created under the folder :

/ligo/svncommon/SeiSVN/seismic/HAM-ISI/H1/HAM3/CRS/CRS_tilt_TF_070626.xml

Ideally those measurements would look like the ones we measured at MIT (see https://alog.ligo-la.caltech.edu/SEI/index.php?callRep=2564)

The excitation is running through the RY ISO exc point with the ISI damped with the following awggui template : 

/ligo/svncommon/SeiSVN/seismic/HAM-ISI/H1/HAM3/CRS/ry_exc.txt 

(open awggui from this folder ->File->Open Configuration-> Select ry_exc.txt) 

The first number in the notch filter notch(0.016,30,20) will need to be adjusted to the actual CRS frequency. The excitation gain in the 'overall Gain'  will also need to be adjusted to minimize saturation, and maximize coherence with the CRS.