[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<cburford1 at 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<cburford1 at 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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