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 <[email protected]> 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 > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
