40m QIL Cryo_Lab CTN SUS_Lab TCS_Lab OMC_Lab CRIME_Lab FEA ENG_Labs OptContFac Mariner WBEEShop
  40m Log  Not logged in ELOG logo
Entry  Thu Dec 16 15:10:18 2010, josephb, kiwamu, Update, CDS, ETMY working at the expense of ETMX 
    Reply  Fri Dec 17 02:22:06 2010, kiwamu, Update, CDS, ETMY damping: not good 
       Reply  Mon Dec 20 10:06:36 2010, kiwamu, Update, CDS, ETMY damped 2010Dec18.png
Message ID: 4075     Entry time: Mon Dec 20 10:06:36 2010     In reply to: 4068
Author: kiwamu 
Type: Update 
Category: CDS 
Subject: ETMY damped 

  Last Saturday I succeeded in damping the ETMY suspension eventually.

This means now ALL the suspensions are happily damped. 

It looked like some combination of gains and control filters had made unstabie conditions.


  I actually was playing with the on/off switches of the control filters and the gain values just for fun.

Then finally I found it worked when the chebyshev filters were off. This is the same situation as Yuta told me about two months before.

Other things like the input and the output matrix looked nothing is wrong, except for the sign flips at ULSEN and SDSEN as I mentioned in the last entry (see here).

So we still should take a look at the analog filters in order to make sure why the signs are flipped.

ELOG V3.1.3-