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Entry  Tue Sep 7 08:12:50 2021, Aidan, Computing, Cymacs, +/-18V power supply to AI/AA chassis was actually +18V, -14.5V IMG_4578.jpgIMG_4577.jpg
    Reply  Tue Sep 7 11:52:40 2021, rana, Computing, Cymacs, +/-18V power supply to AI/AA chassis was actually +18V, -14.5V 
Message ID: 2658     Entry time: Tue Sep 7 08:12:50 2021     Reply to this: 2660
Author: Aidan 
Type: Computing 
Category: Cymacs 
Subject: +/-18V power supply to AI/AA chassis was actually +18V, -14.5V 

[Aidan]

I was working in the QIL on Friday and I heard a clicking sound coming from the rack where the DAQ is installed. It turned out to be the DC power supply for the AI/AA chassis. One of the voltage was floating around from ~14.2V to ~14.8V and the unit was clicking as it did this. Since the AA/AI chassis expect +/-18V which is regulated down to +/-15V, this was, to use the scientific term, bad.

I set the low voltage channel back to 18V. We have noticed previous drifts DAC channels - it's possible this was the cause.

 

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