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Entry  Wed Sep 21 23:05:16 2011, Paul, Update, SUS, ITMY and SRM actuator response functions - fitting results ITMY_PITCH_actuator_response_FIT.pngITMY_YAW_actuator_response_FIT.pngSRM_PITCH_actuator_response_FIT.pngSRM_YAW_actuator_response_FIT.png
    Reply  Wed Sep 21 23:25:51 2011, kiwamu, Update, SUS, Re:ITMY and SRM actuator response functions - fitting results 
       Reply  Wed Sep 21 23:44:45 2011, Paul, Update, SUS, Re:ITMY and SRM actuator response functions - fitting results 
Message ID: 5508     Entry time: Wed Sep 21 23:25:51 2011     In reply to: 5507     Reply to this: 5509
Author: kiwamu 
Type: Update 
Category: SUS 
Subject: Re:ITMY and SRM actuator response functions - fitting results 

Did you take the 180 deg shift into your account ?

Since your measurement was done when the loop was closed, there must be an additional 180 deg phase shift (in other words, minus sign).

Quote from #5507

In the end I just fitted the response magnitude. I was initially fitting the complex response function, but ran into problems which I think were cased by overall phase offsets between the data and test function. Can I canvass for opinion if fitting the magnitude is OK, or should I try again fitting the phase too?

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