[time-nuts] How To Measure Long Term Phase Stability Of An Oscillator

[W3KL]

Magnus. Thanks.  If I understand, this reduces to a measurement of frequency
stability along a measurement of phase noise?

Jeff

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Magnus Danielson
Sent: Sunday, September 22, 2013 7:47 AM
To: time-nuts at febo.com
Subject: Re: [time-nuts] How To Measure Long Term Phase Stability Of An
Oscillator

On 09/22/2013 01:30 PM, W3KL wrote:
> How does one make a measurement of the phase stability of an 
> oscillator over a time period much larger than the oscillator period?  
> For example, I have an oscillator with a frequency of 4 MHz and I want 
> to measure the phase drift of the RF between a given point in time and 
> then a time 4 seconds later.  I want to make a measurement that has a 
> precision of 0.1 degree or better.
You want to measure a drift of 4/(4E6*3600) = 278 ps. You systematic
frequency error can be at maximum 1.39E-10 relative, For your noise side
look at TDEV at tau of 4 s, multiply that number by at least three and it
should when added with peak frequency error be below 278 ps.

Cheers,
Magnus
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