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Entry  Thu Sep 4 19:39:36 2014, Tara, Evan, DailyProgress, FSS, TTFSS OLTFs pdhTFs.pdf
    Reply  Sun Sep 7 11:54:21 2014, Evan, DailyProgress, FSS, TTFSS OLTFs, residual frequency noise pdhTFs.pdfoltfNorth.pdfoltfSouth.pdffrnoise.pdfnoiseBudget.pdf
       Reply  Mon Sep 8 04:20:41 2014, rana, DailyProgress, FSS, TTFSS OLTFs, residual frequency noise 
       Reply  Wed Oct 2 19:09:31 2019, anchal, DailyProgress, FSS, TTFSS OLTFs; Repeated this 5 year old measurement FSS_OLTF.pdf
          Reply  Thu Jan 9 19:00:19 2020, anchal, DailyProgress, FSS, TTFSS OLTFs FSS_OLTF.pdf
             Reply  Wed Jan 22 14:16:28 2020, anchal, DailyProgress, FSS, TTFSS OLTFs FSS_OLTF.pdf
                Reply  Wed Jan 22 16:00:26 2020, anchal, DailyProgress, FSS, TTFSS OLTFs with Maximum Gain FSS_OLTF.pdf
                   Reply  Thu Jan 23 19:23:03 2020, anchal, DailyProgress, FSS, NFSS Boost Stage NorthFSSBosstStageTF.pdf
Message ID: 2515     Entry time: Wed Jan 22 14:16:28 2020     In reply to: 2508     Reply to this: 2517
Author: anchal 
Type: DailyProgress 
Category: FSS 
Subject: TTFSS OLTFs 

Repeated these measurements after changes to the RFPDs (Notch improved).

Inferences:

  • No significant shape change is observed in the Open loop Transfer Functions (OLTFs).
  • Only minor absolute value changes have happened which just indicate a change in overall transimpedance at omega frequencies of the RFPDs.
  • This indicates that if non-linearity was affecting anything, it at least wasn't the shape of the OLTFs or the suppression of laser noise.
  • Also, these measurements endorse that no major harm has been done to the circuits in the process of modification (as should be the case).

Data

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