[time-nuts] Re: NTP Accuracy

[Bob kb8tq]

Hi

I suspect that somebody somewhere in the documentation 
process got accuracy and resolution a bit crossed up. 

Resolution would be pretty easy to observe. 

In a broad sense, to be accurate to 1/2 ns, the time base in
the card would need to be pretty good. Even with a good 
onboard reference, there still would be a “this accurate over 
that time span” in a footnotes somewhere. 

NTP floats off through various networking bits and pieces. 
That would make direct measurement of sub ns sort of numbers
pretty much impossible via the normal protocol and interface. 

A bit more digging into that spec sheet is needed.

Bob

> On Feb 21, 2022, at 10:00 AM, martyn at ptsyst.com wrote:
> 
> Hello,
> 
> 
> 
> I have a board that is a NTP server.  Any ideas on how to test its accuracy?
> 
> 
> 
> To check it roughly I sync my PC to it, maybe set the time to +3 hours and
> confirm my PC follows.
> 
> 
> 
> But its supposed to be accurate to 500 ps and I want to verify that.
> 
> 
> 
> Best Regards
> 
> Martyn 
> 
> 
> 
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