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Entry  Fri Nov 7 10:52:57 2008, steve, Update, PEM, AC is back on acf.jpgacc_mc1.jpgtest.jpg
    Reply  Fri Nov 7 15:58:10 2008, rana, Update, PEM, AC is back on mc-acc.pdfmc-acc-quad.pdf
       Reply  Mon Nov 10 19:39:40 2008, steve, Update, PEM, thump noise from particle counter partcfm.jpg
          Reply  Tue Nov 12 23:05:06 2013, rana, Update, PEM, thump noise from particle counter 
             Reply  Wed Nov 13 11:30:07 2013, Steve, Update, PEM, particle counter MOVED Met1Moved.JPG
Message ID: 1121     Entry time: Fri Nov 7 10:52:57 2008     Reply to this: 1122
Author: steve 
Type: Update 
Category: PEM 
Subject: AC is back on 
The 20 minutes and 6 sec thumps are not related to the 40m ac units
This period is precisely right on so it is not likely mechanical as a source.
The time and frequency domain of this signal at attachment 2&3

First I had the chilling water cut off and later I turned off the fans
as 5 hrs temp plot shows
Attachment 1: acf.jpg  73 kB  | Hide | Hide all
acf.jpg
Attachment 2: acc_mc1.jpg  48 kB  | Hide | Hide all
acc_mc1.jpg
Attachment 3: test.jpg  70 kB  | Hide | Hide all
test.jpg
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