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Sun Aug 5 13:28:43 2018, gautam, Update, CDS, c1lsc flaky
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Mon Aug 6 00:26:21 2018, gautam, Update, CDS, More CDS woes
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Mon Aug 6 14:38:38 2018, gautam, Update, CDS, More CDS woes 
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Mon Aug 6 19:49:09 2018, gautam, Update, CDS, More CDS woes
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Tue Aug 7 11:30:46 2018, gautam, Update, CDS, More CDS woes
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Tue Aug 7 22:28:23 2018, gautam, Update, CDS, More CDS woes
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Wed Aug 8 23:03:42 2018, gautam, Update, CDS, c1lsc model started
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Thu Aug 9 12:31:13 2018, gautam, Update, CDS, CDS status update
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Wed Aug 15 21:27:47 2018, gautam, Update, CDS, CDS status update
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Tue Sep 4 10:14:11 2018, gautam, Update, CDS, CDS status update
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Wed Sep 5 10:59:23 2018, wgautam, Update, CDS, CDS status update
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Thu Sep 6 14:21:26 2018, gautam, Update, CDS, ADC replacement in c1lsc expansion chassis
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Fri Sep 7 12:35:14 2018, gautam, Update, CDS, ADC replacement in c1lsc expansion chassis
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Mon Sep 10 12:44:48 2018, Jon, Update, CDS, ADC replacement in c1lsc expansion chassis
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Thu Sep 20 11:29:04 2018, gautam, Update, CDS, New PCIe fiber housed 
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Thu Sep 20 16:19:04 2018, gautam, Update, CDS, New PCIe fiber install postponed to tomorrow
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Fri Sep 21 16:46:38 2018, gautam, Update, CDS, New PCIe fiber installed and routed 
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Message ID: 14140
Entry time: Mon Aug 6 19:49:09 2018
In reply to: 14139
Reply to this: 14142
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Author: |
gautam |
Type: |
Update |
Category: |
CDS |
Subject: |
More CDS woes |
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I've left the c1lsc frontend shutdown for now, to see if c1sus and c1ioo can survive without any problems overnight. In parallel, we are going to try and debug the MC1 OSEM Sensor problem - the idea will be to disable the bias voltage to the OSEM LEDs, and see if the readback channels still go below zero, this would be a clear indication that the problem is in the readback transimpedance stage and not the LED. Per the schematic, this can be done by simply disconnecting the two D-sub connectors going to the vacuum flange (this is the configuration in which we usually use the sat box tester kit for example). Attachment #1 shows the current setup at the PD readout board end. The dark DC count (i.e. with the OSEM LEDs off) is ~150 cts, while the nominal level is ~1000 cts, so perhaps this is already indicative of something being broken but let's observe overnight. |
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