[time-nuts] Re: Instruments for 1PPS accuracy measurement

[Magnus Danielson]

Ed,

Depending on what your challenge / interest is, different starting 
points may be more relevant. Doing a E5504 is naturally awesome and 
great starting point for your type of challenge. I know that I need to 
improve my abilities in that end of the spectrum. However, the 
mentioning of PPSes makes the counter and GPSDO end of things a 
reasonable starting-point. I've found that learning both long-term 
stability and phase-noise. Actually, there is a third aspect which is 
the jitter tolerance of systematic (often modeled on sine) which adds to 
this.

For ADEV and friends, I mostly use the TimePod these days, because of 
the low noise-floor, but I think doing a cheap counter for first rounds 
of learning is reasonable, and then once things becomes clearer, 
specialization in tools can be done more in the direction needed. I have 
not got a PhaseStation or E5504 yet for instance. Got a PhaseStation at 
work I can borrow thought. :)

I do got some interesting other setups, but need to work on those.

Cheers,
Magnus

On 2024-09-05 00:29, Ed Marciniak via time-nuts wrote:
> Is it reasonable to suggest someone download lady heather or PN (via 
> KE5FX) and play with some hardware that works with it so they know the 
> right questions to ask?
>
> I jumped off the deep end, starting with an E5504 phase noise system.
>
> For my use case though, I want to build better microwave LOs and 
> quantify the improvement. They could be 10Hz off and it wouldn’t 
> matter. They just can’t be drifting too much to find other states ins 
> buried in the noise?
> ________________________________
> From: Bob Camp via time-nuts <time-nuts at lists.febo.com>
> Sent: Wednesday, September 4, 2024 2:15:58 PM
> To: Discussion of precise time and frequency measurement 
> <time-nuts at lists.febo.com>
> Cc: Bob Camp <kb8tq at n1k.org>
> Subject: [time-nuts] Re: Instruments for 1PPS accuracy measurement
>
> Hi
>
> What are you trying to do?
>
> Some GPSDO’s can be *very* accurate.
>
> As you go from worrying about nanoseconds to worrying about 
> picoseconds or femtoseconds the “what you need” (and what it costs) 
> goes up.
>
> In what environment are you trying to do it?
>
> A research organization with million dollar equipment budgets is very 
> sort of thing than a basement lab looking for gear on eBay.
>
> Do you already have a standard to compare to?
>
> All of this work is a “compare A to B” sort of thing. This becomes at 
> least as important as the measuring instrument. Ideally you would like 
> a standard that is much better than the device you are measuring. This 
> can get a bit crazy.
>
> What is the objective of your project?
>
> This as much as anything will drive what you need and what you should 
> be looking for.
>
> Lots and lots of directions this could go and heading in the wrong 
> direction is going to get very confusing very fast.
>
> Bob
>
>> On Sep 4, 2024, at 6:33 AM, jelveh_t--- via time-nuts 
>> <time-nuts at lists.febo.com> wrote:
>>
>> HiI am new to time and frequency measurements.
>> I want an instrument to measure and compare 1PPS stability and 
>> accuracy of different GPSDOs and GPS modules.I did not see any advice 
>> or help on the site for the instruments suitable for these type of 
>> measurements.Would you mind helping me find a list of suitable 
>> instruments? It would be appreciated if the price and lead time of 
>> each instrument is provided, as well.Thank you for helping me.
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