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Entry  Tue Feb 27 16:34:26 2018, Steven Block, DRS4 Dead times 6x
    Reply  Tue Feb 27 17:04:12 2018, Stefan Ritt, DRS4 Dead times 
       Reply  Tue Feb 27 18:04:18 2018, Steven Block, DRS4 Dead times 
          Reply  Tue Feb 27 18:12:32 2018, Stefan Ritt, DRS4 Dead times 
Message ID: 659     Entry time: Tue Feb 27 16:34:26 2018     Reply to this: 660
Author: Steven Block 
Subject: DRS4 Dead times 

Hello All,

I am currently trying to figure out how to properly characterize the dead time of the DRS4 board. My most recent experiment to try and answer this question involved using an external trigger that can range from 1Hz to 2MHz. I fed this trigger into the DRS4 and collected 1000 samples with no input to any channels. I repeated this across the range of my external trigger by a factor of ten [10Hz, 100Hz, 1kHz...etc]. After I had saved these runs in XML format, I looked at the difference between timestamps on the events. Attached are my findings. Can someone offer an explanation for the periodic peaks? I am new to the DRS4 and don't really understand how it works. My guess is that there is a buffer that has to be emptied every so often, but if so, the buffer emptying time varies with the frequency of the trigger. I would ideally like to be able to know the relation of the dead time to a particular setting I change on the DRS4 such as locking the sampling speed or changing external trigger frequency. 

Best,

Steven

Attachment 1: 1kHz.png  72 kB  | Hide | Hide all
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Attachment 2: 1MHz.png  71 kB  | Hide | Hide all
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Attachment 3: 10Hz.png  253 kB  | Hide | Hide all
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Attachment 4: 10kHz.png  68 kB  | Hide | Hide all
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Attachment 5: 100Hz.png  73 kB  | Hide | Hide all
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Attachment 6: 100kHz.png  69 kB  | Hide | Hide all
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