40m QIL Cryo_Lab CTN SUS_Lab TCS_Lab OMC_Lab CRIME_Lab FEA ENG_Labs OptContFac Mariner WBEEShop
  40m Log  Not logged in ELOG logo
Entry  Sat Jan 17 15:07:28 2015, manasa, Update, General, Beat note frequency discrepancy 
    Reply  Mon Jan 19 11:03:32 2015, manasa, Update, General, RF connections to adder 
    Reply  Thu Jan 29 11:59:48 2015, manasa, Update, General, Beat note frequency discrepancy Freq_compare1.pngFreq_compare2.png
Message ID: 10956     Entry time: Thu Jan 29 11:59:48 2015     In reply to: 10918
Author: manasa 
Type: Update 
Category: General 
Subject: Beat note frequency discrepancy 

Below is the set of plots comparing measurements for the green and IR beat notes frequencies. The measurements were made on the spectrum analyzer at the same time. So I have not taken measurement error into account. 
From the plots, the discrepancy is not very large.

Attachment 1:
Shows the two sets of measurements scaterred along y=x.

Attachment 2:
Since plot 1 shows the points tightly scattered to y=x, I plotted the difference between the two measurements against their mean to blow out the deviations.

I will do the same comparison using the frequency counter readout once we have RF amplifiers installed.

Attachment 1: Freq_compare1.png  8 kB  | Hide | Hide all
Attachment 2: Freq_compare2.png  8 kB  | Hide | Hide all
ELOG V3.1.3-