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Entry  Thu May 30 13:15:55 2013, Evan, DailyProgress, Computers, Temporary south refcav autolocker 
    Reply  Fri May 31 13:21:37 2013, tara, DailyProgress, Computers, Temporary south refcav autolocker 
       Reply  Fri May 31 14:23:49 2013, Evan, DailyProgress, Computers, Temporary south refcav autolocker 
    Reply  Mon Jun 3 11:42:03 2013, Evan, DailyProgress, Computers, Temporary south refcav autolocker 
Message ID: 1188     Entry time: Fri May 31 14:23:49 2013     In reply to: 1187
Author: Evan 
Type: DailyProgress 
Category: Computers 
Subject: Temporary south refcav autolocker 

Quote:

Quote:

 Special bonus settings: the common gain on the TTFSS is 404 clicks, the fast gain is 426 clicks, and the offset is 967 clicks. Tara pointed out that the frequency loop would catch lock easier if the gain settings were around these low values rather that what they were previously (~600).

 The offset should be ~ 500. I turned it back down.

 OK. But if you sweep the laser frequency you can see a DC offset in the error signal (OUT1 on the common path on the TTFSS), and at least a few days ago it was making the loop catch in a place where it shouldn't.

Obviously the long-term solution is to track down the source of the offset and make it go away. But in the short term is there something we can do to make sure the loop doesn't lock to this false point?

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