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Entry  Thu May 28 16:43:52 2015, Steve, Update, PEM, Guralps swapped GursSwapped.png
    Reply  Mon Jun 1 15:22:19 2015, Steve, Update, PEM, Guralps X- short cable is bad seismGur1-2.png
       Reply  Wed Jul 29 14:32:01 2015, Steve, Update, General, How not to solder coldSoldering.jpg
          Reply  Thu Jul 30 10:38:18 2015, Steve, Update, PEM, Y sesimostation is back on Guralps_are_back_on.pngYstation.jpg
             Reply  Thu Jul 30 13:34:52 2015, Koji, Update, PEM, Y sesimostation is back on 
                Reply  Thu Jul 30 15:24:54 2015, Steve, Update, PEM, Y sesimostation is back on NewShortCable-Y-B-Gur2.pnginterfaceInputSwapped.pngsameasAtm2.png
                   Reply  Fri Jul 31 10:36:22 2015, Steve, Update, PEM, X seismo station short cable removed IMG_0009.JPG
                      Reply  Sat Aug 1 20:46:29 2015, Koji, Update, PEM, X seismo station short cable removed 
                   Reply  Wed Aug 12 11:44:13 2015, ericq, Update, PEM, Gur2 Channels still wonky gur2_centered.png
                      Reply  Fri Aug 14 09:07:45 2015, Steve, Update, PEM, Gur interface box is wonky Gur1&2.pnglongCablesSwapped.png
                         Reply  Fri Aug 14 12:10:08 2015, Koji, Update, PEM, Gur interface box is wonky 
                            Reply  Tue Aug 18 11:16:17 2015, Steve, Update, PEM, Gur interface box is wonky IMG_0009.JPG
                               Reply  Wed Aug 19 07:58:25 2015, Steve, Update, PEM, Gur interface box  GurADCbox.jpg
                                  Reply  Thu Aug 20 11:31:55 2015, Koji, Update, PEM, Gur interface box  IMG_1958.JPG
                                     Reply  Fri Aug 21 17:15:13 2015, Steve, Update, PEM, Gur interface box  
                                        Reply  Fri Aug 28 17:04:12 2015, Steve, Update, PEM, Gur interface box cable fixedNewLongCable.png
                                           Reply  Fri Aug 28 20:20:26 2015, rana, Update, PEM, Gur interface box cable 
                                              Reply  Tue Sep 1 10:36:06 2015, Steve, Update, PEM, Gurs swapped GurA@ETMY.png
                                                 Reply  Thu Sep 17 16:04:09 2015, Steve, Update, PEM, Gurs  
                         Reply  Fri Aug 14 17:20:01 2015, Jenne, Update, PEM, Gur interface box is wonky 
Message ID: 11497     Entry time: Wed Aug 12 11:44:13 2015     In reply to: 11469     Reply to this: 11505
Author: ericq 
Type: Update 
Category: PEM 
Subject: Gur2 Channels still wonky 

In previous elogs, we saw that the X and Y spectra out of GUR2 (X end Guralp seismometer) looked strange (i.e. inconsistent with the GUR1 spectra). 

This morning, Steve and I brought the handheld control unit to the Guralp to center the test mass, by adjusting the centering potentiometers inside the unit while monitoring the voltage readout corresponding to the DC mass position (manual has instructions). 

At first glance, this seemed like the likely culprit, as the offsets for the horizontal directions were much larger than the vertical one. We zeroed all three to within a mV or two. Unfortuntately, the spectra look the same as they did 10 hours ago. no

Since we already had the kit out, we checked the offsets for GUR1. Only the "East/West" had an offset over 50mV, so we zeroed that one, but left the others alone. 

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gur2_centered.png
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