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Entry  Sun May 24 09:34:27 2015, Peter Steinberg, Peculiar behavior of time values for Rev5 DRS4 EB 
    Reply  Wed Jun 3 09:07:38 2015, Stefan Ritt, Peculiar behavior of time values for Rev5 DRS4 EB 
Message ID: 424     Entry time: Sun May 24 09:34:27 2015     Reply to this: 426
Author: Peter Steinberg 
Subject: Peculiar behavior of time values for Rev5 DRS4 EB 

Hi -

I am setting up a new DRS4 rev5 but using drivers and software we were recently using with a Rev4 (with a recent release of the drs4 code, from mid-2014). 

I am writing since I see peculiar behavior of the calibrated times when I read them back from the Rev 5.  I get events where the first time returns 0 (which was always the case on my Rev 4), but the following time is negative -- this seems to be wrong since the times should always increase.

Is it a problem with my running the time calibration or a problem with the board itself?  For the record, the integral nonlinearity displayed during time calibration "looks" very different when running with the same (recent) drsosc on the two boards.  The rev5 has apparently a much larger amplitude.

- peter

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