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Entry  Sat Feb 19 17:25:29 2011, S S Upadhya, how to synchronize Sampling frequency of two evaluation boards 
    Reply  Sat Feb 19 22:46:35 2011, Stefan Ritt, how to synchronize Sampling frequency of two evaluation boards 
       Reply  Mon Feb 21 08:10:31 2011, Stefan Ritt, how to synchronize Sampling frequency of two evaluation boards 
          Reply  Mon Feb 21 12:42:33 2011, S S Upadhya, how to synchronize Sampling frequency of two evaluation boards 
Message ID: 114     Entry time: Mon Feb 21 08:10:31 2011     In reply to: 113     Reply to this: 115
Author: Stefan Ritt 
Subject: how to synchronize Sampling frequency of two evaluation boards 

Stefan Ritt wrote:

S S Upadhya wrote:

 Dear sir,

We have two evaluation boards of DRS4. We would like to use 8 inputs to be recorded on a trigger and we would like to find the relative time difference of inputs. So is it possible to synchronize the sampling frequency of the two evaluation boards. 

with best regards

S S Upadhya

No, not in this version. We plan a future version of the evaluation board with clock synchronization, but that board will not be ready before 2-3 months. Anyhow the board is more meant as an evaluation board, to test the chip and develop own electronics, and not to build a complete DAQ system. Note that CAEN distributes now a VME board containing the four DRS4 chips and 32 channels on a board. 

Well, one thing you can do is to generate an external trigger and send it to the external trigger input of both cards. Then you can determine the time in respect to the trigger point in both boards. But since the trigger cell jitters by 2-3 cells in each chip, the accuracy is limited to about 1-2 ns when running at 2 GS/s. 

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