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

[W3KL]

Magnus.  Thanks.  Re-read your original post and along with your latest I
now understand what's needed.

I will come back if I have other questions.

Thanks!

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 1:02 PM
To: time-nuts at febo.com
Subject: Re: [time-nuts] How To Measure Long Term Phase Stability Of An
Oscillator

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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