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    User name V. Sulkosky

    Log entry time 19:02:42 on February 09, 2009

    Entry number 260047

    This entry is a followup to: 260010


    keyword=Re: L1A Signal at left HRS TS

    Jack and I looked at the L1A signal coming from the BigBite weldment on a
    RG-8 cable. The signal was fairly distorted such as Bob and I saw
    yesterday afternoon while switching to 1-DAQ mode. The signal at the
    BigBite weldment looked fine. Jack was concerned about the crimping of the
    RG-8, so we checked the reflection from the RG-8 cables. They
    termination appears to be fine. If the problem returns, which only
    appears to happen during accesses, we will replace the RG-8 cable.

    In the process of doing these checks the signal coming to the left HRS
    TS cleaned up. Prior to this, Jack and I had checked the connector
    upstairs and was unable to change the distortion in the signal. The
    problem appears to have originated at the BigBite weldment patch panel.
    When Jack applied pressure to the connection downstairs, I could see the
    distortion come back. For now we left the cable as is.

    Prior to leaving the hall, I took a couple of runs 1187 and 1188.
    Figure 1 shows the correlations between Raster BPM signals between the
    copy in BigBite and the left HRS and the difference between the helicity
    from the ADC and TIR. These plots show the behavior that we expect to

    A copy of this log entry has been emailed to: rom,moffit,kalyan,brads,segal

    Correlation Check for 1188