Naoki and I left PSAMs at 8.8/-0.67 in 77268, and yesterday afternoon 77389 we changed them in a test that we reverted. But last night a 3am, the offsets didn't change but the PSAMs strain readbacks changed. The PSAMs actually changed as this can be seen in the alignment readback sensors. Plot attached
Did some strange electronics issue happen with SQZ last night that also impacted the TTFSS: 77418
After suggestion from Richard, it seems like lots of things in H1-SQZ-R1 saw a glitch at 9:58UTC (2:58amPT), plot attached. This may have been caused by or related to the SQZT0 - Laser Locking Fiber Beat Note Chassis power regulator board failure: 77418, 77403.
As the PSAMS have hysterisis, when ZM5 turned back from 0V to it's noimnal, the strain volatge readback chanegd from -0.6V to -1.5. We reverted it back to -0.6V.
ZM2 PSAMS changed less than 1%.
This starts FRS Ticket 31062.