Problem sem4160 SNF 2009-08-26 09:52:28: emission current erratic

druist at snf.stanford.edu druist at snf.stanford.edu
Wed Aug 26 09:52:28 PDT 2009


imaging was good, but the emmision current was behaving erratically.  Specifically, when the current would drift down & I'd press the on button to bring it backup to the usual 12 uA. Sometimes the current would go up to 24 uA, sometimes it would go to zero.  Turnining the emmission off & on one or two times would get the emmission back to the usual value.




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