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