We have started looking at the synthetic supersensors we created in seiproc for SPI commissioning and there are some things going on there I don't understand. For the 2 attached plots I look at 3 different versions of the table motion or loop error point, some calibrated GS13 CAL channels, the synthetic supersensors and the ISO loop inputs. For each subplot, red is the supersensor, blue is CAL CART GS13s, and green is the ISO in, first image is HAM2, second is HAM3, they weren't taken at the same time, so the spectra don't look exactly the same. I (probably naively) would expected all of these too look the same, with a caveat about sensor correction for the supersensor channels, the cps used there is before the sum with sensor correction, so the GS13 CAL and supersensor not matching  between .1 and a few hz  for X,Y and Z is because of that.  What I  (and I think Brian and Jeff) don't understand is why the ISO IN channels don't match. The input to the iso loops should just be the sum of the blended cps +senscor and gs13s. The blend filters I put in seiproc to construct the synthetic supersensor are the same ones we run nominally on the ISI. For the rotational degrees of freedom these should be the easiest to understand, but RX & RY for HAM2 and HAM3 are very different. Not sure what is going on. I had found one case of wrong sensors connected to filters in seiproc for HAM2 Z, but that has been fixed.

I have checked the signal routing out of the ISI master blocks to ipc senders to ipc receivers in seiproc and down to filter modules that generated the supersensors and haven't found any more errors, but it's a lot to look through. I have also spot checked that the right filters are installed in a number of places where supersensors don't look right, and have not found any errors so far there, either. I will try to keep looking. One of the next things I  will do is read all the filters in matlab and plot them there, to make sure that all the filters are right.