patrick.thomas@LIGO.ORG - posted 16:35, Monday 16 January 2017 - last comment - 16:40, Monday 16 January 2017(33347)
Observing
23:49 UTC Accepted SDF differences from corrective maintenance (sdf_diff.png) and went to observing. We increased the gain on ETMY mode 10 to damp the 4735 Hz violin mode. PI mode 28 almost immediately rang up after going to observing. I was able to damp it by changing the phase and gain. PI mode 27 rung up soon after. I had much more trouble damping this one, but it seems to have come back down now. I dropped out of observing upon changing its PLL set frequency (H1:SUS-PI_PROC_COMPUTE_MODE27_PLL_SET_FREQ) to match its frequency count (H1:SUS-PI_PROC_COMPUTE_MODE27_PLL_FREQ_COUNT_OUTPUT). 00:21 UTC Accepted SDF difference for change in PI mode 27 PLL set frequency (sdf_diff_pi.png) and went back to observing. The range started around 60 MPc and is steadily decreasing.
Images attached to this report
Comments related to this report
00:37 UTC Dropped out of observing to change gain for ETMY mode 10 from .1 to .02, as the mode 10 output was starting to ring up (see attached).
Images attached to this comment
