CMS Pixel Detector Miscellaneous
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Entry  Mon Oct 28 17:01:05 2019, Matej Roguljic, Software, Investigating the bug with the Keithley client 
    Reply  Tue Oct 29 16:38:32 2019, Matej Roguljic, Software, Investigating the bug with the Keithley client 
       Reply  Wed Oct 30 16:54:58 2019, Matej Roguljic, Software, Investigating the bug with the Keithley client 
Message ID: 30     Entry time: Wed Oct 30 16:54:58 2019     In reply to: 26
Author: Matej Roguljic 
Category: Software 
Subject: Investigating the bug with the Keithley client 

Matej Roguljic wrote:

Matej Roguljic wrote:
We took module 1529 and tried recreating the issue observed in the beginning of October. To do this in a reasonable amount of time, a "shorttest" procedure was defined which consists only of pretest and pixelalive. Three runs were taken

Run number 1: Shorttest@10,IV@10
Run number 2: Shorttest@10, IV@10,Cycle(n=1, between 10 and -10), Shorttest@10, IV@10
Run number 3: Shorttest@10, IV@10, Cycle(n=5, between 10 and -10), Shorttest@10, IV@10

In runs 1 and 2, IV was done from -5 to -155 in steps of 10
In run 3, IV was done from -5 to -405 in steps of 10

No issues were observed during the tests themselves.

Running MoReWeb shows the Temperature, Humidity and Sum of Currents plots while individual tests show only Pixel Alive map. IV plot is missing in the MoReWeb output, however, it is present in the ivCurve.log file. Tried investigating why IV is not shown, but couldn't get to the bottom of it.

Tomorrow we'll use M1529 and M1530 in a FullTest to check if the problem would appear.



M1530 was put in the coldbox and qualification was started, but the pxar output was full of deserializer errors. The continuous stream of errors made the log file pretty large and slowed down the execution of the qualification so it was aborted. Later it was noticed that there are green depositions on the module like it was on the HDIs irradiated at 60Co facility in Zagreb which is probably why there were so many errors.

M1521 was used instead of M1530 along with M1529. Full qualification was launched around 11:00. It ended around 6:30 without any issues.


Running full qualification on 30.10. in the morning on modules 1510, 1529, 1521. Fourth module was not included since there was an issue with the 4th DTB which will be investigated late. Like the previous day, the qualification ended around 17:00 without issues. In conclusion, the issue is not present in the qualification setup at the moment.
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