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Entry  Wed Aug 7 15:05:59 2013, Hermann-Josef Mathes, Repeated time calibration 
    Reply  Wed Aug 7 15:10:57 2013, Stefan Ritt, Repeated time calibration 
       Reply  Wed Aug 7 15:20:33 2013, Hermann-Josef Mathes, Repeated time calibration 
          Reply  Wed Feb 5 13:41:42 2014, Stefan Ritt, Repeated time calibration 
Message ID: 284     Entry time: Wed Aug 7 15:20:33 2013     In reply to: 283     Reply to this: 330
Author: Hermann-Josef Mathes 
Subject: Repeated time calibration 

Stefan Ritt wrote:

Hermann-Josef Mathes wrote:

Hi,

 

is there any (obvious) reason why it is not possible (or not indended) to repeat the time calibration of a DRS4 eval board several times. I get the shown error message from the 'drscl' tool as well when I try to call the corresponding method in the support library:

mathes@ikauger5:~/src/DRS4> drs-4.0.1/drscl
DRS command line tool, Revision 20430
Type 'help' for a list of available commands.

Found DRS4 board  0 on USB, serial #2362, firmware revision 17662

B0> tcalib
Enter calibration frequency [GHz]: 5
Creating Timing Calibration of Board #2362
[==================================================]
B0> tcalib 5
Creating Timing Calibration of Board #2362
Error performing timing calibration, please check waveforms

 

As I will be in holidays, the answer is not urgent.

Thanks

 -- Hermann-Josef

 

Ups, this is certainly a bug. Try to restart drscl between calibrations. Anyhow the calibration is poor (~20ps), so in a month or two we will have a much better one (~3ps), but that needs a new board (then will be called V5).

/Stefan

 

 Hi Stefan,

thanks for the quick reply, I know that this solution works with drscl but not within my code.

I tried to track it down, but gave up very soon. Seems as if AnalyzeWF() which is called by CalibrateTiming() finds to much zero-crossings when it is called the second time.

Regards

  -- Hermann-Josef

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