I don't really think this is related to the poor range, but it seems that one of the cps on HAM3 has excess high frequency noise and has been noisy for a while.
First image is 30+ day trends of the 65-100hz nad 130-200hz blrms for the HAM3 cps. Something happened about 30 days ago that cause the H2 cps to get noisy at higher frequency.
Second image are rz location trends for all the HAM ISI for the last day around the power outage. HAM3 shows more rz noise after the power outage.
Last image are asds comparing HAM2 and HAM3 horizontal CPS. HAM3 H2 shows much more noise above 200hz.
Since finding this, I've tried power cycling the CPS on HAM3 and reseating the card, but that so far has not fixed the noise. Since this has been going for a while, I will wait until maintenance to try to either fix or replace the card for this CPS.
I've replaced the noisy cps, and adjusted the cps setpoint to maintain the global yaw alignment, meaning I looked at the free hanging (iso loops off) position before and after the swap and changed the RZ setpoint so the delta between the isolated and freehanging position for RZ was the same with the new sensor. New sensor doesn't show either the glitching or high frequency noise that the old sensor had. I also changed the X and Y set points, but those only changed a few microns and should not affect IFO alignment.
