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Tue Oct 8 08:08:18 2019, gautam, Update, PEM, PEM BLRMS anomaly
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Wed Oct 23 11:49:21 2019, gautam, Update, PEM, PEM BLRMS anomaly 
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Thu Oct 24 18:37:15 2019, gautam, Update, PEM, T240 checkout
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Tue Nov 5 12:37:50 2019, gautam, Update, PEM, T240 interface unit pulled out 
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Wed Nov 13 19:34:45 2019, gautam, Update, PEM, Follow-up on seismometer discussion 
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Wed Nov 13 20:15:56 2019, rana, Update, PEM, Follow-up on seismometer discussion
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Wed Nov 13 23:40:15 2019, gautam, Update, PEM, Follow-up on seismometer discussion
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Thu Nov 14 12:11:04 2019, rana, Update, PEM, Follow-up on seismometer discussion
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Fri Nov 15 00:18:41 2019, rana, Update, PEM, Follow-up on seismometer discussion
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Fri Nov 15 12:16:48 2019, gautam, Update, PEM, Follow-up on seismometer discussion
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Mon Nov 18 14:32:53 2019, gautam, Update, PEM, Follow-up on seismometer discussion
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Tue Nov 19 21:53:57 2019, gautam, Update, PEM, Follow-up on seismometer discussion
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Message ID: 14989
Entry time: Wed Oct 23 11:49:21 2019
In reply to: 14949
Reply to this: 14992
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Author: |
gautam |
Type: |
Update |
Category: |
PEM |
Subject: |
PEM BLRMS anomaly |
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I looked into the seismometer situation a bit more today. Here is the story so far - I think more investigation is required:
- There is an abrupt change in the PEM BLRMS channels around 6pm PDT every day. This has been consistently seen for the last two weeks.
- The seismometer spectra look normal - see Attachment #1. The reference traces are from some months ago. There is elevated activity between 0.1-0.3 Hz, but this is seen in all the seismometers in all 3 DoFs.
- I looked at the minute trend of the raw seismometer outputs (before being BLRMSed) for the last 200 days and don't see any abrupt change in characteristics (the data gap is due to the issue in this thread).
- All the correct BLRMS filters seem to be engaged in the respective filter banks.
Attachment #2 has some spectrograms (they are rather large files). They suggest that the increase in noise in the 0.1-0.3 Hz band in the BS seismometer X channel is real - but there isn't a corresponding increase in the other two seismometers, so the problem could still be electronics related.
Quote: |
Yesterday, Koji and I noticed (from the wall StripTool traces) that the vertex seismometer RMS between 0.1-0.3 Hz in the X-direction increased abruptly around 6pm PDT. This morning, when I came in, I noticed that the level had settled back to the normal level. Trending the BLRMS channels over the last 24 hours, I see that the 0.3-1 Hz band in the Z direction shows some anomalous behaviour almost in the exact same time-band. Hard to believe that any physical noise was so well aligned to the seismometer axes, I'm inclined to think this is indicative of some electronics issues with the Trillium interface unit, which has been known to be flaky in the past.
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Attachment 2: |
specGrams.zip
10.335 MB
Uploaded Wed Oct 23 19:17:23 2019
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