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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: 7429     Entry time: Sat Sep 22 01:03:30 2012     Reply to this: 7433   7539   7819
Author: Den 
Type: Update 
Category: PEM 
Subject: ETMY table 

I've installed Guralp readout box back and it turned out that it does not work with voltage provided from the rack (+13.76 0 -14.94).  +/-12 voltage regulators inside the box convert it to -0.9 0 -12. I've connected the box to +/-15 DC voltage supply to measure seismic motion at the ETMY table. Readout box works fine with +/- 15.

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.

Attachment 1: X.pdf  39 kB  | Hide | Hide all
X.pdf
Attachment 2: Y.pdf  39 kB  | Hide | Hide all
Y.pdf
Attachment 3: Z.pdf  39 kB  | Hide | Hide all
Z.pdf
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