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Entry  Fri Jun 1 14:56:08 2012, Jamie, Update, SUS, Oplevs all different, messed up oplevs.png
    Reply  Fri Jun 1 18:07:32 2012, steve, Update, SUS, Oplevs servo values 
    Reply  Fri Jun 1 19:48:54 2012, rana, Update, SUS, Oplevs all different, messed up 
    Reply  Wed Jul 11 16:19:08 2012, yuta, Update, SUS, oplev servo phiology 
Message ID: 6744     Entry time: Fri Jun 1 18:07:32 2012     In reply to: 6743
Author: steve 
Type: Update 
Category: SUS 
Subject: Oplevs servo values 

Quote:

For some reason the state of the oplevs is completely different for almost every suspension.  They have different sets of filters in the bank, and different filters engaged.  wtf?  How did this happen?  Is this correct?  Do we expect that the state of the oplevs should be different on all the different suspensions?  I wouldn't have thought so.

I discovered this because the PRM is unstable with the oplevs engaged.  I don't think it was yesterday.  Is something hidden changing the oplev settings?

 As of February 23, 2012 when oplev PIT and YAW transfer functions were taken

 

OPLEV SERVO 300^ 2:0 BR ELP RLP RES GAIN QPD counts OD mm           
                   
ETMY pit 300^ 2:0 BR 35 80 0.5 -1.5 15,500 ~1  
ETMY yaw 300^ 2:0 BR 35 80 0.6 -1.0      
ETMX pit 300^ 2:0 BR 35 80 0.5 0.5 1,500 ~1.5  
ETMX yaw 300^ 2:0 BR 35 80 0.6 1.0      
ITMY pit 300^ 2:0 BR   80   2.0 15,000 ~2.5  
ITMY yaw 300^ 2:0 BR   80   -4.0      
ITMX pit 300^ 2:0 BR   80   1.0 1,350 ~1.5  
ITMX yaw 300^ 2:0 BR   80   -2.0      
BS pit 300^ 2:0 BR 50     0.5 3,500 ~1  
BS yaw 300^ 2:0   50   3.3 -1.0      
PRM pit 300^ 2:0 BR     3.3 1.0 4,000 ~2  
PRM yaw 300^ 2:0 BR 35   3.3,  4 -0.5      
SRM pit 300^ 2:0 BR 40     -2.0 2,600 ~2.5  
SRM yaw 300^ 2:0 BR 40     2.0      

 

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