It looks like we had another incident of the POP90 power changing, (circled in the striptool screenshot) similar to what Stefan described in 31181. Is this still a problem with the demod as RIchard found the first time? If its only an intermittent problem with the POPAIR 90 demod, we probably don't need to worry about fixing it before O2 because that is jiust a monitor and won't be used if we are able to close the beam diverters for the run.
Detchar question:
Did we have RF45 glitches around these times? The times are roughly 16:26, 16:30, 16:36 and 16:42 Nov 19th local time, which is 0:26, 0:30, ect Nov 20th UTC time.
We were able to fix some obvious problems with this but the problem with the shield was not changed as we did not test it after the fact. Though this problem should only appear if someone was in the rack. Would be interesting to see if anything is on 9,or 45MHz
I took at look at the auiliary channels we used to create DQ flags monitoring RF45 noise in O1, namely H1:LSC-MOD_RF45_AM_CTRL_OUT_DQ and H1:ASC-AS_B_RF36_I_YAW_OUT_DQ. I created BLRMS of these channels in the same way we did in O1 to threshold on. In all of these plots we see a steady BLRMS over 21 hours from 20th Nov 00:00 - 21:00 UTC, indicating that these channels do not see any form of RF45 noise we are used to:
* Plot 1 - BLRMS of H1:LSC-MOD_RF45_AM_CTRL_OUT_DQ between 10-100Hz in 60 seconds strides
* Plot 2 - BLRMS of H1:LSC-MOD_RF45_AM_CTRL_OUT_DQ between 10-100Hz in 1 second strides
* Plot 3 - BLRMS of H1:ASC-AS_B_RF36_I_YAW_OUT_DQ between 30-170Hz in 1 second strides
Hveto for this day indicated that H1:ASC-AS_A_RF45_Q_PIT_OUT_DQ was a good channel to veto noise with on Sunday. I therefore did a BLRMS of this channel:
* Plot 4 - BLRMS of H1:ASC-AS_A_RF45_Q_PIT_OUT_DQ between 5-100 Hz in 1 second strides
This channel does show excess noise at certain times of the day. If we were to threshold on this BLRMS using the 99.5% BLRMS value during this time period, we would capture the times Sheila mentions and also veto 8/10 top ten pycbc live triggers for this day.
Not conclusive that this noise is RF45 noise similar to what we saw in O1, investigating further...
Seemingly another incident: circa 2016-11-23 20:25:30 Z.