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    User name kramerk

    Log entry time 01:25:10 on July24,2001

    Entry number 67337

    keyword=Target - NMR/EPR - 45.0%/44.1%

    Conditions: 3 lasers on, no gradient field, holding field @ 180 deg., pick-up coils position.

    00:44 - Asked MCC to mask the Target FSD
    00:45 - Moved Target into pick-up coils position
    00:48 - Performed NMR
    00:50 - Failed EPR. RF field did not turn on. There was no change in the resonance. I waited until the sweep trigger was finished. During this time the green light on the HP FG did not come on. I assumed it was a communications problem. I stopped the EPR VI. I put the HP FG in local and reset the amplitude to 0.4 V rms and turned the FG on.
    00:54 I tried to do another sweep, but now the EPR VI is not reading the SRS620 counter. I assume its a LabVIEW problem and exit LabView and reenter the TO screen and start the EPR AFP VI again.
    00:58 Perform a successful EPR measurement!
    01:00 Moved target back in to Pol. 3He position

    LabVIEW extraction of NMR signal - 45.0%

    EPR fits using Xiaochao's code:
    0th order fit:
    down: freq. shift = -49.14 KHz +/- 1.79 KHz, P = -44.88%+/- 1.63%
    up: freq. shift = 47.65 KHz +/- 1.64 KHz, P = 43.52%+/- 1.50%
    1st order fit:
    down: freq. shift = -48.23 KHz +/- 1.74 KHz, P = -44.04%+/- 1.59%
    up: freq. shift = 48.19 KHz +/- 1.62 KHz, P = 44.01%+/- 1.48%

    comments: final EPR looks good! Holding field a little lower than previous EPR.