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| 40m Log |
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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: 13777
Entry time: Fri Apr 20 23:36:28 2018
In reply to: 13763
Reply to this: 13787
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| Author: |
Kevin |
| Type: |
Update |
| Category: |
PEM |
| Subject: |
Seismometer BLRMs |
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Steve secured the GPS time server in the rack above the AA board and removed the wooden block that it was resting on. The new rack is shown in attachment 1.
I then opened the AA board to see why the channels aren't working. Even though the board was powered and outputting 4.6 V, none of the chips were getting power. I must have shorted something while trying to diagnose this and the board is no longer powered either.
The schematic is given in D990147. The D68L8EX filter is bypassed on all the channels, as can be seen in attachment 3, so the board isn't really doing anything. Rana suggested that we could just bypass the whole circuit by wiring the IN channels directly to the OUT channels going to the ADC. I'll try that next for a single channel. |
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