Re: [time-nuts] TimeLab phase difference (slope sec/sec)

[Chris Burford]

Hi Dana,

My PRS10 is the DUT that has its 1PPS(Out) wired into the TICC on ChA. 
The reference is my GPSDO which has a 8663-XS DOCXO and has its 
1PPS(Out) wired into the TICC on ChB. The 10 MHz clock signal for the 
TICC comes from my GPSDO also, which as I understand, need not be quite 
so precise when measuring in time interval mode.

Chris


On 07/03/19 04:01:38, Dana Whitlow wrote:
Chris,

Ok, one source is a PRS-10.  Is it the DUT or the reference?  And if it's
the DUT, what
is the reference source?

Dana


On Tue, Jul 2, 2019 at 8:00 PM Chris Burford<cburfo...@austin.rr.com>
wrote:

Hi Bob,

I'm seeing 4.22E-12 as the slope value in the upper right of the TimeLab
phase difference plot. Is that telling me that my DUT is within +4.22ps
/ sec from my reference 1PPS for the 24 hour measurement duration?

I have attached a screen capture that will hopefully make its way
through for viewing.

Thanks,

Chris

On 07/02/19 11:50:10, Bob kb8tq wrote:
Hi

The difference in seconds between the start phase and the end phase
divided by the number
of seconds duration gives you the parts in whatever of the error.

If you see 1us ( = 1x10^-6 seconds)  of change in a second, you are off
by 1 ppm (or 1x10^-6).
If you see 1 us of change in 1,000 seconds you are off by 1 ppb (or
1x10^-9). At a bit over 10
days (1,000,000 seconds) your 1 us change is 1 ppt (or 1x10^-12).

Bob

On Jul 2, 2019, at 10:17 AM, Chris Burford<cburfo...@austin.rr.com>
wrote:
Is the slope value for the phase difference shown in TimeLab an average
of the overall data sample duration? The reason I ask is that my service
manual for my RFS says:
/"//A faster way to make the comparison between the reference frequency
and the DUT is to use the time interval measurement mode of the counters.
In this case, the time intervals between the 10MHz zero crossings of the
reference frequency and the DUT are measured and averaged. If this time
interval changes by less than 10ps per second, then the DUT is within 1
part in //10^11 of the frequency reference."/
I'm just curious if the phase difference slope value can be plugged in
to this equation.
Regards,

Chris


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