40m QIL Cryo_Lab CTN SUS_Lab TCS_Lab OMC_Lab CRIME_Lab FEA ENG_Labs OptContFac Mariner WBEEShop

40m Log  Not logged in

List  |  Find  |  Login  |  Help

Fri Nov 7 10:52:57 2008, steve, Update, PEM, AC is back on        Fri Nov 7 15:58:10 2008, rana, Update, PEM, AC is back on           Mon Nov 10 19:39:40 2008, steve, Update, PEM, thump noise from particle counter              Tue Nov 12 23:05:06 2013, rana, Update, PEM, thump noise from particle counter                 Wed Nov 13 11:30:07 2013, Steve, Update, PEM, particle counter MOVED

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

Attachment 2: acc_mc1.jpg  48 kB  | Hide | Hide all

Attachment 3: test.jpg  70 kB  | Hide | Hide all

ELOG V3.1.3-