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Entry  Fri Aug 30 18:40:01 2019, anchal, Notes, BEAT, Quick note: BN detector changed to NF1811 
    Reply  Wed Sep 4 14:41:33 2019, anchal, Notes, BEAT, Quick note: BN detector changed to SN101 and other changes 
       Reply  Thu Sep 5 19:52:06 2019, anchal, Notes, BEAT, Quick note: FSS gain reduced, Moku input range changed 
          Reply  Tue Sep 10 19:43:02 2019, anchal, Notes, BEAT, Quick note: Detector changed to NF1811 
             Reply  Mon Sep 16 18:03:33 2019, anchal, Notes, BEAT, Quick note: Detector changed to Sn101 
                Reply  Tue Oct 1 17:28:25 2019, anchal, Notes, BEAT, Quick note: Moku connected with USB 
                   Reply  Tue Oct 15 13:23:16 2019, anchal, Notes, Safety, Quick note: Shutting Down Lasers as Safety Sign is not working 
                      Reply  Tue Oct 15 18:53:00 2019, anchal, Notes, Safety, Quick note: Lasers started again 
                         Reply  Wed Oct 16 19:11:11 2019, anchal, Notes, BEAT, Quick note: Cavities locked; Changed BN Freq Counter Poll Rate 
                            Reply  Fri Oct 18 17:47:49 2019, anchal, Notes, BEAT, Quick note: BN Noise bakc to where it was. 
                               Reply  Mon Nov 4 20:13:44 2019, anchal, Notes, BEAT, Quick note: FSS Loop Gain Changes 
                                  Reply  Wed Jan 22 15:20:00 2020, anchal, Notes, BEAT, Notch improved on FSS RFPDs. Gain values increased as well. 
                                     Reply  Thu Jan 30 10:55:22 2020, anchal, Notes, BEAT, Lowest ever beatnote spectrum today. CTN_Daily_BN_Spec.pdf
                                        Reply  Wed Feb 12 10:01:04 2020, anchal, Notes, BEAT, Increased sampling rate to 125kSa/s; lowest noise in higher frequencies 
Message ID: 2530     Entry time: Wed Feb 12 10:01:04 2020     In reply to: 2523
Author: anchal 
Type: Notes 
Category: BEAT 
Subject: Increased sampling rate to 125kSa/s; lowest noise in higher frequencies 

I have increased the sampling rate of moku to 125 kSa/s (fastest allowed) for the frequency-time series acquisition. After reading matermost chat of Sean Leavey etc, I felt I might have downconverted aliased noise as earlier sampling rate was just 15.625 kSa/s. This didn't change the noise below 1 kHz but we see some improvement above 1 kHz so I'll keep this from now on. The measured time series files are not around 900 Mb, so I'm not saving them and only keeping the psd calculated using modifiedPSD.py script.


Latest BN Spectrum: CTN_Latest_BN_Spec.pdf

Daily BN Spectrum: CTN_Daily_BN_Spec.pdf


Relevant elog post:

CTN:2521 and replies: Beanote Spectrum vs FSS Gain Values 

CTN:2528: Cleaned up table; Installed hex beam dumps

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