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    User name Xf. Zhu, X. Zheng, W. Korsch

    Log entry time 13:20:08 on July18,2001

    Entry number 66623

    keyword=Target - EPR: 40.0 %

    12:45 pm EPR measurement

    Conditions: beam on, cell position: reference cell, B-field: 0 deg, lasers #5,6,7 on,
    all grad. coils off

    1st
    down: freq. shift = -44.01 KHz +/- 1.67 KHz, P = -40.19%+/- 1.52%
    up: freq. shift = 42.80 KHz +/- 1.76 KHz, P = 39.09%+/- 1.60%

    0th
    down: freq. shift = -44.68 KHz +/- 1.65 KHz, P = -40.80%+/- 1.51%
    up: freq. shift = 42.31 KHz +/- 1.75 KHz, P = 38.64%+/- 1.59%

    Comments: We did not find an EPR signal for quite a while; tested Lockin
    amp., checked outputs of Wavetek, SRS FG, everything ok. Finally we looked at
    output from PI feedback box (with modulation signal connected only), output
    signal looked quite noisy, disconnected V_mod. input and reconnected it
    again, then D2 appeared.
    Best guess for problem: oxidized contact of V_mod input.

    NOTE: Lockin AC gain: 40dB / Input limit: 30mV now .
    (all other EPR prms were as before).