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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: 11537     Entry time: Fri Aug 28 17:04:12 2015     In reply to: 11523     Reply to this: 11540
Author: Steve 
Type: Update 
Category: PEM 
Subject: Gur interface box cable 
Ara! Onara suru tsu-mori datta keh-do, un-chi ga de-chatta...
Quote:

 

Quote:

As reported previously, the transfer functions of the channels look fine. (i.e. All channels almost identical.)
I checked the chain from the unit input to the DAQ BNC connectors. They were all OK.

Today I have been checking the signals on the unit with the long DB37 cables connected.
I could not see anything on the Gur2 channels on the board. I looked at the DB37 for Gur2 and felt something is wrong.

I opened the housing of the cable and realized that all the pins are not fully inserted.
The wires were crimped improperly and prevents them to be fully inserted.

=> We need to redo the crimping to insert them.
=> We need to check the other side too.

I'm making a new long cable. Both connector ends of this X arm long cable were terrible. It was removed from the cable tray yesterday.

The Y arm Guralp is running fine. The interface box is open in front of 1X1 on a cart and it is alive!    Please be aware of it !

The new cable was made this way:

Pins were located with ohm meter for locations and both ends were cut off.The Belden 1424A cable than was soldered to DB37 and Guralp circular connector " IKPT06F16-26S-ND "

This cable will connect the ADC interface box CCD# DO 60506 to Guralp seismometer at the sout end.

The Guralp's each 3 axies will be connected through a twisted pair to the differential input op amp

Gur  ouput  vertical axis + -  on circular connector   A, B  to DB37 pin 1 &20

Gur output        N/S axis + -  on circular connector   C, D to DB37 pin 2 & 21

Gur output       E/W axis + -  on circular connector   E, F to DB37 pin 3 & 22

Power +12 VDC  from DB37 pin 29 to Gur circular connector pin c (lower case)

Power -12 VDC  from DB37 pin 24 to Gur circular connector pin  M Note: this connection was absent at the first test of this cable!

Ground              from DB37 pin 10 to Gur circular connector pin b (lower case)

Summery: I may destored the opamp  at the Guralp A at the south end.

 

 

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