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Message ID: 1580     Entry time: Sun Sep 13 11:31:04 2015
Author: Antonio 
Type: DailyProgress 
Category: BEAT 
Subject: PLL noise comparison at different PDH gain settings 



Measurement of the PLL noise have been taken at different PDH gains settings. Noise start to increase when the gain on the oh North loop

are below North: Common/Fast=500/300 and South: Common/Fast=420/420. Stays fairly the same with higher values.


The measurement are still in V/sqrt(Hz), but for now I use them only for comparison purpose.



Noise comparison at different gains: In the legend are the "values" of the gains (the numbers on the knobs)

Current measurements in Vrms/sqrt(Hz)

Beat freq = ~ 65 MHz;

FM deviation = 400kHz

gain = 20;



Data are on the lab control/home/data/20150912_PLL_noise/


Attachment 1: NoiseComparison_20150912_Vrms.pdf  40 kB  | Hide | Hide all
Attachment 2: NoiseComparison_20150912_Vrms.pdf  40 kB  | Hide | Hide all
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