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Entry  Sat Sep 22 01:03:30 2012, Den, Update, PEM, ETMY table X.pdfY.pdfZ.pdf
    Reply  Mon Sep 24 17:03:39 2012, Jenne, Update, PEM, 1X1 rack power 
    Reply  Fri Oct 12 22:44:49 2012, Den, Update, PEM, ETMY table 6x
       Reply  Sun Oct 14 11:41:42 2012, Den, Update, PEM, ETMY table DSC_4739.JPG14OCT2012.pdf14OCT2012.xml
    Reply  Thu Dec 13 01:49:53 2012, rana, Update, PEM, seismometers a.pdf
       Reply  Thu Dec 13 21:21:34 2012, Den, Update, PEM, seismometers gur.pdfgur_fix.pdf
Message ID: 7539     Entry time: Fri Oct 12 22:44:49 2012     In reply to: 7429     Reply to this: 7540
Author: Den 
Type: Update 
Category: PEM 
Subject: ETMY table 


Seismic noise on the ETMY table measured to be a few times higher then on the floor in horizontal direction in the frequency range 50 - 200 Hz. Attached are compared spectrums of X, Y and Z motions.

Accelerometers were installed on the ETMY table and nearby ground to measure amplification of the seismic noise due to the table. During this experiment ground and table motions were measured simultaneously.

DSC_4734.JPG     DSC_4736.JPG

Attachment 1: etmy_x_psd.pdf  38 kB  | Hide | Hide all
Attachment 2: etmy_y_psd.pdf  38 kB  | Hide | Hide all
Attachment 3: etmy_z_psd.pdf  37 kB  | Hide | Hide all
Attachment 4: etmy_coh.pdf  58 kB  | Hide | Hide all
etmy_coh.pdf etmy_coh.pdf etmy_coh.pdf
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