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Entry  Mon Apr 19 05:54:50 2010, rana, Configuration, PSL, RC Temperature Servo Turned OFF temporarily Untitled.png
    Reply  Mon May 3 17:49:41 2010, rana, Configuration, PSL, RC Temperature Servo Turned OFF temporarily rct.png
       Reply  Tue May 4 02:28:38 2010, rana, Configuration, PSL, RC Temperature Servo Turned OFF temporarily 
          Reply  Tue May 4 06:32:58 2010, alberto, Configuration, PSL, RC Temperature Servo Turned OFF temporarily 
             Reply  Wed May 5 02:37:55 2010, rana, Configuration, PSL, RC Temperature Servo Turned OFF temporarily Picture_7.png
Message ID: 2876     Entry time: Tue May 4 06:32:58 2010     In reply to: 2875     Reply to this: 2881
Author: alberto 
Type: Configuration 
Category: PSL 
Subject: RC Temperature Servo Turned OFF temporarily 

Quote:

 

 My attempt to passively measure the transfer function of the foam failed fantastically.

As it turns out, the room temperature fluctuations inside the PSL box reach the 1 mK/rHz noise floor of the  AD590 (or maybe the ADC) at ~1-2 mHz. Everything at higher frequencies is noise.

So to see what the foam is doing we will have to do something smarter - we need a volunteer to disable the RC temperature servo from the EPICS screen and then cycle the PSL table lights every hour in the morning.

We'll then use our knowledge of the Laplace transform to get the TF from the step responses.

 more detailed instructions needed....

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