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Entry  Fri Jul 12 12:51:13 2013, Charles, Update, ISS, RMS Noise from PMC Transmission 
    Reply  Fri Jul 12 13:15:43 2013, Koji, Update, ISS, RMS Noise from PMC Transmission 
       Reply  Fri Jul 12 18:30:20 2013, Charles, Update, ISS, RMS Noise from PMC Transmission 
Message ID: 8839     Entry time: Fri Jul 12 18:30:20 2013     In reply to: 8838
Author: Charles 
Type: Update 
Category: ISS 
Subject: RMS Noise from PMC Transmission 

Quote:

It would be better to measure the power spectrum density of the fluctuation.
The RMS does not tell enough information how the servo should be.
In deed, the power spctrum density gives you how much the RMS is in the entire or a specific frequency range.

I wanted the RMS noise simply to establish a very rough estimate of thresholds on RMS detectors that will be part of my device. If you refer to elog 8830, I explain it there. Essentially, when the ISS is first engaged, only one of the 2 or 3 filter stages will be active. Internal RMS threshold detection serves to create a logic input to switch subsequent filters to their 'on' stage.

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