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Entry  Wed Aug 8 20:34:29 2012, Jenne, Update, ASS, Trouble measuring sensing matrix 
    Reply  Wed Aug 8 20:50:39 2012, Koji, Update, ASS, Trouble measuring sensing matrix 
       Reply  Thu Aug 9 00:23:11 2012, Jenne, Update, ASS, Trouble measuring sensing matrix 
          Reply  Thu Aug 9 01:26:03 2012, Koji, Update, ASS, Trouble measuring sensing matrix 
Message ID: 7123     Entry time: Wed Aug 8 20:34:29 2012     Reply to this: 7124
Author: Jenne 
Type: Update 
Category: ASS 
Subject: Trouble measuring sensing matrix 

I turned on the ASS, without closing the loops, to try to measure the sensing matrix. 

The Yarm was locked (Eric did a nice job earlier - he'll ELOG ABOUT IT before he goes home!), and I used an LO CLKGAIN of 300 on all of the TRY Lockins.  Then I put on and took away a 10% offset in pitch, but it's almost impossible to see the difference. 

The attached is a truly awful screenshot, but you can kind of see what's going on.  The big steps are me increasing the LO gain, but around "0" on the x-axis I changed the pitch offset from 10% away to nominal.  Since there are such big oscillations, the change is basically non-existent.  Grrrr. I'll look at it again tomorrow, since I have an exiting bike ride home ahead of me....

 

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