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Entry  Sat May 23 11:03:20 2015, Felix Bachmair, Issue with Trigger rates below ~100Hz drs_v5_newStefan_10Hz.pngdrs_v5_newStefan_4Hz.pngdrs_v5_500_160Hz.pngdrs_5-0-0_4hz.png
    Reply  Thu Jul 2 08:53:17 2015, Felix Bachmair, Issue with Trigger rates below ~100Hz 
Message ID: 423     Entry time: Sat May 23 11:03:20 2015     Reply to this: 435
Author: Felix Bachmair 
Subject: Issue with Trigger rates below ~100Hz 

Hi

We are working with the DRS 4 V5 version and we investigated an issue with the trigger at rates below ~120 Hz.

As long as we have a trigger rate of more than 125 Hz. everything seems to work fine and we are recording more or less all events.

As soon as we go lower in input trigger rate to 100Hz, we see a drop in trigger rates to approx 15 - 20 Hz.

When we use the new firmware we can see that the busy signal is  0 for much longer times than usual up to .5 seconds.

 

We made a plot of input trigger rate vs trigger rate of drs: https://plot.ly/~simon.corrodi/316

 

In the  oscilloscope plots one can see the the trigger in in yellow and the trig out from drs board in blue.

 

Do you have any idea what could be the reason?

 

We also

Attachment 1: drs_v5_newStefan_10Hz.png  24 kB  Uploaded Sat May 23 19:21:25 2015  | Hide | Hide all
drs_v5_newStefan_10Hz.png
Attachment 2: drs_v5_newStefan_4Hz.png  27 kB  Uploaded Sat May 23 19:21:25 2015  | Hide | Hide all
drs_v5_newStefan_4Hz.png
Attachment 3: drs_v5_500_160Hz.png  18 kB  Uploaded Sat May 23 19:21:25 2015  | Hide | Hide all
drs_v5_500_160Hz.png
Attachment 4: drs_5-0-0_4hz.png  19 kB  Uploaded Sat May 23 19:21:25 2015  | Hide | Hide all
drs_5-0-0_4hz.png
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