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

[Magnus Danielson]

Jeff,

You need to measure phase with sufficient resolution and rate of time. I
was vague on the equipment side but rater noted what you needed to do in
the analysis-side.

I would prefer to measure it at least with 10 measurements a second. Bob
mentioned resolution, which is important as you don't want your
measurement being swamped by measurement noise.

I would use a TimePod, but not all of us have one, which is a pitty as
it is a good instrument suitable for exactly this.

Cheers,
Magnus

On 09/22/2013 02:01 PM, W3KL wrote:
> 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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