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Entry  Mon Nov 23 21:30:29 2009, Jenne, Update, LSC, Measured MC length 
    Reply  Tue Nov 24 08:00:16 2009, rana, Update, LSC, Measured MC length 
       Reply  Tue Nov 24 10:36:21 2009, Koji, Update, LSC, Measured MC length 
          Reply  Wed Nov 25 03:05:15 2009, rob, Update, Locking, Measured MC length 
             Reply  Wed Nov 25 14:29:08 2009, rob, Update, Locking, Measured MC length--FSS trend FSStrendpowerjump.png
                Reply  Wed Nov 25 16:13:27 2009, rana, Update, PSL, Measured MC length--FSS trend 
                   Reply  Wed Nov 25 16:44:52 2009, Koji, Update, PSL, Measured MC length--FSS trend 091125_FSS.png
             Reply  Wed Nov 25 15:38:08 2009, rob, Update, Locking, Measured MC length 
Message ID: 2317     Entry time: Mon Nov 23 21:30:29 2009     Reply to this: 2319
Author: Jenne 
Type: Update 
Category: LSC 
Subject: Measured MC length 

With Koji's help, I measured the length of the Mode Cleaner.

The new modulation frequencies (as quoted on the Marconi front panels) are: 

165.980580 MHz

 33.196116 MHz

132.784464 MHz

199.176696 MHz

The Frequency Counter readback is 165980584.101 Hz (a 4Hz difference).  All of the Marconi's front-panel frequencies read ###.##### MHz Ext, and the Frequency standard has it's "locked" light illuminated, and the 1pps input light blinking, so I think everything is still nicely locked to the frequency standard, and the frequency standard is locked to the GPS.

While changing the marconi's, I accidentally touched the MC's 29.5 MHz marconi.  It is set back to the nominal value (according to Kiwamu's rack photos) of 29.485MHz.  But the phase might be sketchy, although hopefully this doesn't matter since we don't do a double demodulation with it.

I also ran the scripts in the wiki page: How To/Diagonalize DRMI Length Control to set the DD Phases.

 

 

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