In addition to the BSC10 accelerometer, the amount of floor motion also increases over the past 6 weeks, though not in a sudden fashion.
This does not correspond to the time of the most recent fan swap, judging by fan accelerometers.
New EX and EY Accelerometer Power Conditioners were installed 30 January 2024. This is roughly the same time as some of these jumps in the trend. The EY BSC 10 accelerometer cable had a questionable connector but still functioned so I believe we left it, it may need to be replaced.
https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=75592
We replaced the loose connector but did not see any effect on the signal. While down there we looked at the output and found that channel 5 output was very noisy, and looking back at the notes in my prior ALOG, channel 5 = PEM EY BSC ACC X and back then it did not register as an accelerometer. I assume this accelerometer is not functional or the cabling is not correct. We plan to go back on Tuesday and track down the issue with this accelerometer and possibly repair the channel in the power conditioner chassis.
Other notes
The INPUT to CH3 on the power conditioner is "TBL-Y" accelerometer cable. When unplugged this affected "BSC-Y" signal plot.
The INPUT to CH4 on the power conditioner is "BSC-Z" accelerometer cable. When unplugged this affected "BSC-Z" signal plot. (this one was correct)
Looking back at my analysis of the drawings in the linked ALOG, the above note matches the drawings in the DCC D1300773. I propose we assume the cables are swapped incorrectly but labeled correctly, and we rearrange the cables to match the drawing.
Marc, Fil, Gerardo, Janos
Refer to LHO:76728.