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    User name V. Sulkosky

    Log entry time 10:35:29 on October25,2007

    Entry number 209555

    Followups:

    keyword=LHRS BPM/Raster Cable

    After further troubleshooting, problems with the spot++ on both left
    and right HRSs, it appears that the BPM/Raster cable plugged into
    the ADC on ROC4, slot 21 channels 16-31 was plugged in upside down
    for the left HRS.

    The db_rb.Raster.dat database file claims that channels 16-19 are
    used for BPMA, 20-23 for BPMB and 24-27 for the raster. The way the
    cable was plugged in was reversed, i.e., BPMA 31-28, BPMB 27-24, and
    raster in channels 23-20. What I saw was that the ground was plugged
    into the positive inputs and the signal into the negative. This is
    opposite in comparison to the right arm BMP/Raster ADC in ROC2,
    slot # 23. I switched the cable so that it now agrees with the
    database file.

    This should be verified by an DAQ expert and tested when beam comes back.