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    User name brads

    Log entry time 18:03:33 on February 12, 2009

    Entry number 260735

    keyword=Lots of noise on BB T8 gate upstream of TS and scalers (and probably T6) due to T7 input

    The 'T7' trigger hsdn't been moved to a safe location and was still generating noise on adjacent channels in the slot 6 (from left) Phillips 726 ECL-NIM unit. The noise on T8 appears as a sharp, 2--3ns dropout of the T8 pulse to ground before it recovers. This was probably happening on T6 as well. That said, I couldn't see any glitches on the downstream T8 so perhaps these dropouts were either too short for downstream units to 'see'.

    The T7 signal was moved to a different unit and adjacent channels were checked for cross talk on the scope. I could still see some correlated noise on adjacent channels, but it was very low amplitude. None of the correlated drop-outs were seen either.

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