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Message ID: 85     Entry time: Wed Mar 3 15:59:10 2010
Author: Tara Chalermsongsak 
Type: Laser 
Category: RC noise 
Subject: Noise from function generator 

 I took the data of frequency noise of the functiongenerator("Marconi") and spectrum analyzer's noise from Mott's elog on  Nov 13 14:37:11 2009,  AdhikariLab.  Thanks, Mott

 To measure the noise @160Hz, two Functiongenerators are set at 160MHz, then mix two signals togather to get phase noise. Multplying the phase noise by corresponding frequencies to get frequency noise. 

Assuming two ideal function generators, the freq noise is divided by sqrt(2) to get noise contributed by one function generator.

The attached graph shows frequency noise from Marconi noise, detector noise(spectrum analyzer that measured Marconi noise) , beat noise( noise from beating two beams after the cavities), and estimated noise.

VCO noise will be updated soon.

Attachment 1: Noise.pdf  19 kB  | Hide | Hide all
Noise.pdf
Attachment 2: Noise.fig  99 kB
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