1. Lock loss
Except of the last three lock loss in Fig.1. ETMY MN SUM jump may affect, but in current six hours, the situation would be stable.
2. Sudden dropping the sensitivity
2-1. Around 17:26(UTC) Fig.2.
We can see the f^-3 like slope in 20 - 300 Hz.
There are large peaks in 40 Hz, 183 Hz, 185 Hz and 646 Hz
Both 183 and 185 Hz violin would come from the ETMX.
182.92188 NOEYIMP NOIYIMP NOIXIMP EXIMP 11/14:49:00
184.79688 NOETIMP NOIYIMP NOIXIMP EXIMP 11/14:14:00
646 Hz is really unknown (No hint from bruco)
2-2 Around 18:15 (UTC) Fig.3.
We can see the f^-3 like slope in 20 - 300 Hz.
There are large peaks in 494 Hz, 596 Hz, 617 Hz and 632 Hz (No hint from bruco)
2-3 Around 19:40 (UTC) Fig.4.
Not a slope, but many peaks appeared.
Peaks around 40 Hz became larger.
2-4 Morning time
As already reported, when the construction work started, the sensitivity became worse (Fig.5.)
This construction work sometimes stopped (< 5 min?), then sensitivity recovered.
Fig.6. and Fig.7. showed the spectrum during the construction work.
Around the harmonics of the power lines, there are side band signal, and around 857 Hz, many sideband signal appeared, but no peak in 857 Hz.
Anyway, why the width of the harmonics of power line noise (540 Hz and 660 Hz) large?
