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40m
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| 40m Log |
Not logged in |
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 Tue Dec 26 17:24:24 2017, Steve, Update, General, power outage 
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 Thu Dec 28 17:22:02 2017, gautam, Update, General, power outage - CDS recovery
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Thu Jan 4 14:39:50 2018, gautam, Update, General, power outage - timing error
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Fri Jan 5 21:54:28 2018, rana, Update, General, power outage - timing error
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Fri Jan 5 22:19:53 2018, gautam, Update, General, power outage - timing error
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Sat Jan 6 18:27:37 2018, gautam, Update, General, power outage - IFO recovery
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Mon Apr 16 22:09:53 2018, Kevin, Update, General, power outage - BLRM recovery
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Tue Apr 17 09:57:09 2018, Steve, Update, General, seismometer interfaces
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Wed Apr 18 20:33:19 2018, Kevin, Update, General, seismometer interfaces
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Fri Apr 20 23:36:28 2018, Kevin, Update, PEM, Seismometer BLRMs
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Tue Apr 24 21:19:08 2018, Kevin, Update, PEM, Seismometer BLRMs
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Wed Apr 25 17:44:39 2018, Arnold, Update, PEM, PEM Anti-Alias wiring
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Thu Apr 26 09:35:49 2018, Kevin, Update, PEM, PEM Anti-Alias wiring
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Thu Apr 26 20:22:21 2018, Kevin, Update, PEM, ADC common mode rejection with new seismometer connections
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Wed May 16 21:02:22 2018, Kevin, Update, PEM, ADC common mode rejection with new seismometer connections
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Thu Jun 14 15:24:32 2018, Steve, Update, PEM, ADC DAC In Line Test Boards are in
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Tue Jan 2 15:43:35 2018, Steve, Update, VAC, pumpdown after power outage
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Wed Feb 7 15:50:42 2018, Steve, Update, VAC, IFO pressure monitoring
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Message ID: 13790
Entry time: Thu Apr 26 09:35:49 2018
In reply to: 13788
Reply to this: 13794
13964
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| Author: |
Kevin |
| Type: |
Update |
| Category: |
PEM |
| Subject: |
PEM Anti-Alias wiring |
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I wired all 32 channels going to the AA board directly to the ADC as described in the previous log. However, instead of using the old AA board and bypassing the whole circuit, I just used a breakout board as is shown in the first attachment. I put the board back in the rack and reconnected all of the cables.
The seismic BLRMs appear to be working again. A PSD of the BS seismometers is shown in attachment 2. Tomorrow I'll look at how much the ADC alone is suppressing the common mode 60 Hz noise on each of the channels.
Steve: 5 of ADC DAC In Line Test Boards [ D060124 ] ordered. They should be here within 10 days. |
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