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    User name R. Michaels

    Log entry time 03:28:37 on November22,2005

    Entry number 161008

    This entry is a followup to: 161006

    Followups:

    keyword=another rate calibation, saturation observed

    Actually run 3137 does NOT make sense !!

    Run 3138: Try again at lower currents

    Event 21K see 1 uA
    Event 62K ask for 0.5 uA
    Event 84K see 0.5 uA
    Request 0.2 uA
    Event 177K see 0.2 uA
    Event 218K ask for 2.0 uA
    Event ~250K have 2.0 uA

    We can see the "saturation" in rate online. Rates are semi-linear
    up to ~0.5 uA then saturates at 2 MHz. I think it may be due to
    the discriminator output which is 100 nsec --> max rate 10 MHz.
    Presumably we have significant electronic deadtime. FWIW, the
    scalers are rated 200 MHz. We could probably do a little better
    next time with narrow (10 nsec) pulses.