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Entry  Mon Nov 3 15:16:28 2014, Dmass, Noise Hunting, Noise Budget, New beat spectrum: ErrSigs.pngBeatNz.png
    Reply  Mon Nov 3 16:15:21 2014, Dmass, Noise Hunting, Noise Budget, Beat spectrum not ltd by  
       Reply  Mon Nov 3 20:27:28 2014, Dmass, Noise Hunting, Noise Budget, ISS servo fail? 
          Reply  Wed Nov 19 14:54:36 2014, nicolas, Noise Hunting, Noise Budget, ISS servo fail?  
       Reply  Tue Dec 2 22:51:52 2014, Dmass, Noise Hunting, Noise Budget, Beat spectrum not ltd by  PDH_demod_chain.png
          Reply  Sat Sep 12 14:25:05 2015, Dmass, Noise Hunting, Noise Budget, Beat spectrum not ltd by  
    Reply  Mon Nov 3 20:36:14 2014, Dmass, Noise Hunting, Noise Budget, New beat spectrum: 
       Reply  Tue Nov 25 22:45:43 2014, Dmass, Noise Hunting, Noise Budget, New beat spectrum: 
          Reply  Wed Dec 3 17:02:31 2014, Dmass, Noise Hunting, Noise Budget, Noise budget cleaning up 
             Reply  Thu Dec 4 02:45:49 2014, Dmass, Noise Hunting, Noise Budget, Noise budget cleaning up PDH_sensing_nz.pngLB1005inputNoise.png
                Reply  Sun Dec 7 12:42:55 2014, rana, Noise Hunting, Noise Budget, Scatter Noise hump is RAM 
Message ID: 1174     Entry time: Wed Dec 3 17:02:31 2014     In reply to: 1168     Reply to this: 1175
Author: Dmass 
Type: Noise Hunting 
Category: Noise Budget 
Subject: Noise budget cleaning up 

Looked at noisebudget on SVN and some of the measurements are dated / no loner applicable:

Update Noisebudget:

  • PDH sensing noise with transformers in demod chain
  • LB1005 input referred noise with low pass + higher gain setting
  • Current driver output noise (measured across resistive load with Rai's low noise preamp)
  • PDH loops E+W
  • Transmitted RIN E+W (potentially new minima)

Take and compare:

  • Err and control for E+W PDH past 100 kHz (and scope RMS / peak to peak vs integrated RMS of PSD)

 

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