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| 40m Log |
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 Sat Sep 22 01:03:30 2012, Den, Update, PEM, ETMY table 
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 Mon Sep 24 17:03:39 2012, Jenne, Update, PEM, 1X1 rack power
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Fri Oct 12 22:44:49 2012, Den, Update, PEM, ETMY table 6x
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Sun Oct 14 11:41:42 2012, Den, Update, PEM, ETMY table
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Thu Dec 13 01:49:53 2012, rana, Update, PEM, seismometers
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Thu Dec 13 21:21:34 2012, Den, Update, PEM, seismometers
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Message ID: 7429
Entry time: Sat Sep 22 01:03:30 2012
Reply to this: 7433
7539
7819
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| Author: |
Den |
| Type: |
Update |
| Category: |
PEM |
| Subject: |
ETMY table |
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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. |
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