[time-nuts] GPSDO - Does it work?

[Azelio Boriani]

It is normal for a counter to have a +/- 1 count of wander. Then you
have to consider the reference for that counter. When you connect a
GPSDO on the input of a counter with its internal reference used as a
timing source, you are measuring that internal reference accuracy and
stability, not the GPSDO's one. To verify a new GPSDO it is necessary
to have another (know good) GPSDO or a Cs reference. Missing that, you
can use the PPS output of the GPS receiver but then an average process
is needed: say, a digital 'scope with the display persistence function
and... wait a lot of time (or use a high resolution TI counter and the
TimeLab software).

On Mon, Jul 15, 2013 at 4:38 AM, Bob Stewart <bob at evoria.net> wrote:
> OK, I finally decided to plug my new GPSDO into my 5334B and give it a try.  I made mine with 2 outputs: 10MHz and 5MHz.  So, I did the obvious, and perhaps naively expected to see a steady 5.0000000 on the 5334B.  Instead, it bounces back and forth between 4.9999999 and 5.0000000.  Ummm?  Yeah, it's way more accurate than anything I can imagine needing, but it looks like I still have two clocks?
>
> Bob - AE6RV
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