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Entry  Fri Sep 20 12:55:02 2019, gautam, Update, CDS, c1iscaux testing 
    Reply  Mon Sep 23 10:49:34 2019, rana, Update, CDS, c1iscaux testing 
    Reply  Wed Sep 25 20:10:13 2019, Koji, Update, CDS, c1iscaux testing testDetectMons_190925.pngtestIPPOS_190925.png
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                   Reply  Tue Oct 8 03:32:42 2019, Koji, Update, CDS, CM servo board testing 7x
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                         Reply  Tue Oct 8 18:42:39 2019, Koji, Update, CDS, CM servo board testing boosts.pdf
                            Reply  Mon Oct 14 16:06:28 2019, Koji, Update, CDS, CM servo board testing pole_zero_filter.pdf
                               Reply  Mon Oct 14 16:19:30 2019, Koji, Update, CDS, CM servo board testing testb2.pdf
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                                        Reply  Mon Oct 14 17:32:28 2019, Koji, Update, CDS, Portal Elog entry for the recent CM servo board tests CM_Servo_Diagram.png
                         Reply  Tue Oct 8 20:23:03 2019, gautam, Update, CDS, c1iscaux testing 
    Reply  Mon Sep 30 11:20:43 2019, gautam, Update, CDS, c1iscaux testing - CM board code updated CMsoftTest.png
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Message ID: 14955     Entry time: Tue Oct 8 18:42:39 2019     In reply to: 14953     Reply to this: 14965
Author: Koji 
Type: Update 
Category: CDS 
Subject: CM servo board testing 

The boost filters of the CM servo board were tested. Their ZPK models were made.


The transfer functions of the boost filters were measured with the SG output of a SR785 connected to IN1. The IN1 gain was set to be 0dB. The transfer function was taken between the IN1 input and the TEST1A output.
With no boost and normal boost, the input signal amplitude was fixed to 20mVpk. For the other boosts, however, I could expect large gain variation through a single sweep. Therefore automatic SG amplitude tracking was used. The target was to have the output to be 1V with maximum amplitude of 100mV.

Attachment 1 shows the measured transfer functions.

The pole and zero frequencies of the boosts were estimated using LISO. Here the TFs were normalized by the TF of 'no boost' to cancel the delay of the other stages including that of the monitor channel.

 

ZPK model of Normal Boost:

pole 44.0597566447
zero 4.3927650910k

factor 98.8275377818

 

ZPK model of Super Boost (State1):

pole 878.5368382789
zero 17.5107366335k
factor 20.0840668188

 

ZPK model of Super Boost (State2):

pole 714.8112014271
pole 1.0147609373k
zero 13.2470941080k
zero 22.2259701828k

factor 404.5411036031
 

ZPK model of Super Boost (State3):

pole 886.3650348470
pole 420.4089305781
pole 887.8490768202
zero 8.3635166134k
zero 15.7953592754k
zero 20.5144907279k

factor 8.2051379423k

 

Attachment 1: boosts.pdf  146 kB  Uploaded Tue Oct 8 19:46:19 2019  | Hide | Hide all
boosts.pdf
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