[time-nuts] Cycle jumps in Z3801A PPS?

[Brian Kirby]

I cannot say what is happening with the second unit.

I have one, that started jumping like yours.  I did not see anything 
wrong with it.  I recycled the power and it came back OK and has now run 
nonstop for 4 months.....

Brian N4FMN

John Ackermann N8UR wrote:
> I'm looking at the PPS output of my pair of Z3801As.  One of them
> generates a nice plot with about 50ns peak to peak noise over 1 day
> (measured against a 5061A).  You can see that data at
> http://www.febo.com/time-freq/plots/cs1-z3801a_1.html.
>
> However, the second unit seems to have random jumps, usually for just
> one PPS sample and occurring once every hour or two, of very close to
> 100 nanoseconds.  You can see what I'm talking about at
> http://www.febo.com/time-freq/plots/cs1-z3801a_2.html.
>
> Since 10 MHz has a period of 100 ns, I'm guessing that this jump
> indicates some sort of one cycle slip in the PPS generator.
>
> Has anyone else seen this behavior?
>
> John
>
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