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Entry  Wed Nov 11 12:50:10 2009, Jenne, Update, PEM, Seismometer Noise Characteristics HuddleTest_Aug2009data.png
    Reply  Thu Apr 22 20:28:40 2010, Jenne, Update, PEM, Seismometer Noise Characteristics Gur1_Gur2_noise.png
       Reply  Thu May 27 23:59:54 2010, rana, Update, PEM, New Foam Box installed Untitled.png
          Reply  Fri May 28 00:40:53 2010, rana, Update, PEM, DAQ down 
             Reply  Fri May 28 10:44:47 2010, josephb, Update, PEM, DAQ down 
                Reply  Tue Jun 8 18:39:36 2010, rana, Update, PEM, DAQ down 
                   Reply  Tue Jun 8 20:52:25 2010, josephb, Update, PEM, DAQ up (for the moment) 
          Reply  Fri May 28 11:26:35 2010, Jenne, Update, PEM, New Foam Box installed 
          Reply  Tue Jun 1 11:47:14 2010, steve, Update, PEM, lead balls on concrete P1060269.JPG
             Reply  Wed Jun 9 19:47:08 2010, nancy, Update, PEM, lead balls on concrete 
                Reply  Thu Jun 10 07:53:14 2010, Alberto, Update, PEM, LaTeXlabs 
                   Reply  Thu Jun 10 10:58:02 2010, Koji, Update, General, LaTeXlabs 
                      Reply  Thu Jun 10 11:10:21 2010, Alberto, Update, General, LaTeXlabs 
Message ID: 3006     Entry time: Fri May 28 11:26:35 2010     In reply to: 3002
Author: Jenne 
Type: Update 
Category: PEM 
Subject: New Foam Box installed 

Quote:

Valera and I put the 2 Guralps and the Ranger onto the big granite slab and then put the new big yellow foam box on top of it.

There is a problem with the setup. I believe that the lead balls under the slab are not sitting right. We need to cut out the tile so the thing sits directly on some steel inserts.

You can see from the dataviewer trend that the horizontal directions got a lot noisier as soon as we put the things on the slab.

 You'll have to ask Steve how deep he cut, but the tile is cut around the lead balls, so they are not sitting on the linoleum.  They might just be sitting on the concrete slab, or whatever Steve found underneath the tile, instead of fancy steel inserts, but at least they're not on the tile.  I don't know why things got noisier though...

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