J. Kissel

I've briefly taken us out of observation ready at 2020-02-04 00:00:02 UTC to switch the PCALX vs. PCALY "cancelling" line "back" to 1153.1 and 1153.2 Hz respectively (having started the test after calibration tests this morning; see LHO aLOG 54868). Though, they're no longer cancelling, because they are at X = 1153.10 and Y = 1153.20 Hz, instead of both being at 1153.10 Hz as they used to be.

We've returned to observation ready with these new settings at 2020-02-04 00:00:19 UTC, with the frequency changes stored in the OBSERVE.snaps of the calex and caley models. We'll still need to save the settings in the safe.snap, but we can do that tomorrow during maintenance day.

This concludes the lower frequency, X = 530.1 and Y = 530.2 Hz test, having spent 
   2020-02-03 19:53:05 UTC = 1264794803
   2020-02-04 00:00:02 UTC = 1264809620
   dT = 14817.0 seconds or 4.11 hours 
with the 530 Hz line combination on.

Others will perform the data analysis on this data and post results in due time.