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User name jpchen
Log entry time 19:09:01 on May12,2009
Entry number 272746
keyword=reference cell: pressure reading 3 psig off, reset
Evacuated reference cell: vacuum gauge reading -3 while pressure gauge reading -12 psig. It should be -15 psig, so there is 3 psig off-set. I changed the off-set to make it to be -15 psig.