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    User name R. Michaels

    Log entry time 16:42:39 on August31,2009

    Entry number 287247

    This entry is a followup to: 287240

    keyword=re: ADCX6 (ROC26, 4th slot)

    The new 18-bit ADC which Luis put in has a good CSR value.
    It also has reasonable pedestals which can be adjusted, as
    he indicated in halog 287240.
    However, the signal shows some DAC noise, as well as jumps,
    see fig 1.
    The other 3 channels on this board are clean, see fig 2.
    My impression is this has to do with a ground loop.
    Maybe using a cap to break the ground will fix it, as
    I think was observed on L-HRS.

    FIGURE 1

    FIGURE 2