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    User name Moffit

    Log entry time 23:49:39 on March28,2008

    Entry number 228945

    keyword=Zero suppression for BB ADCs (vme)

    For the TWOARM and TS_hadron configuration, zero suppression is enabled after taking atleast 1000 events from T8 (event_ty=8) for ROC5 (BB trigger plane crate). This event threshold is set in the string from the CODA MSQL database(nped=1000).

    Interesting thing about these CAEN 792 ADCs... you can enable zero suppression for ONLY x2 or x16 the value set as the threshold (settable by a single bit). We wanted to set the threshold to be the pedestal mean (at least, for now)... so we shifted the pedestal mean by 1 bit, and set the zero suppression for x2 of this value (done all within the thresholdvme.c routine).

    Tomorrow... I will include ROC5 in the pedrun configuration (to automagically get T8s and set new thresholds).