Yesterday during commissioning, I did some injections on the HAM1 ISI to try to measure the coupling of table motion at that chamber to DARM. Consistent with the multiple logs Elenna has put in the last few days, I don't see much evidence for coupling above 10hz. First 4 attached images show results for the X, Z, RY and RZ dofs. I didn't do Y or RX, I suspect from these results there's not a lot of reason to pursue those, but the each measurement is only 90s and are relatively low risk.

For each injection, I sent a bandpassed (butter("BandPass",8,10,100) in diaggui)  the input of the iso loops, with amplitudes between 2 and 4 (I think 4 would have been fine for all dofs, as far as the IFO was concerned). I then made dtt templates for each excitation dof with spectra for the relevant BLND GS13 dof and CAL_DELTAL, put those filenames and locations in the coupling_plot.py and used the coupling_util.py function attached here, as well as the darm calibration txt. I'm sure these exist somewhere in the svn or something (couldn't find them) but it's taken several days to get this sorted on my own and want half a chance of figuring it out again in the future. I got some help from Huyen, but also used some older copies I had from previous measurements.