[Halld-cal] [New Logentry] BCAL fADC pedestal data with detector off

[dalton at jlab.org]

Logentry Text:
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Pedestal data was taken in the BCAL north fADCs for 25 hours from 12:31 yesterday until 13:22 today with the BCAL detectors powered off.  The same type of time dependent changes were observed (see Fig. 1) as previous two evenings (referenced log entries).   The distribution of the differences in the average over time can be seen in Fig. 2, with a most probable value for this time period of ~1.5 channel change.  

The changes track very well with the temperatures in the crates, which can be seen in Figs. 3 through 5.  I find this to be very compelling evidence that the effect is due to temperature changes on the fADC boards themselves.

This time there are no glitching channels.  The largest change, of 4.36 ADC samples, was for roc 43, slot 5, channel 14 - see Fig. 6.

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This is a plain text email for clients that cannot display HTML.  The full logentry can be found online at https://logbooks.jlab.org/entry/3285753
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