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    User name brads

    Log entry time 17:50:16 on November 18, 2008

    Entry number 249583

    keyword=T7 (BB Cerenkov-only) unplugged from Trigger Supervisor

    At Xin's request I unplugged the twisted-pair T7 (BB Cerenkov only) trigger signal running to the Trigger Supervisor (unplugged at the NIM-ECL converter immediately upstream of the TS). The T7 signal _does_ still run into the scalers and TDC (so you will still see rate on the xscaler display), but no triggers will be handled by the TS regardless of prescales. Apparently it was causing increased deadtime, even when it had the max prescale value at the TS. (I thought the max prescale value was special-cased in the TS CRL and caused the trigger to be disabled... perhaps it's '0'? Or maybe I just imagined that feature...)

    Anyway, T7 is not a meaningful trigger right now. All I want is the scaler information (which is still present).

    The unplugged end of the cable (red-beige pair) is clearly labelled with a '7' and was tucked in with the bundle running to the TS.

    A copy of this log entry has been emailed to: xqian, kalyan