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| 40m Log |
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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: 14949
Entry time: Tue Oct 8 08:08:18 2019
Reply to this: 14989
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| Author: |
gautam |
| Type: |
Update |
| Category: |
PEM |
| Subject: |
PEM BLRMS anomaly |
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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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