Hi
> On Apr 26, 2017, at 2:31 AM, Mark Sims <hol...@hotmail.com> wrote: > > If your frequencies of interest can be divided down to to the 1PPS range, > the TAPR TICC makes for an excellent frequency counter. The TADD-2 Mini > divider handles 1/2.5/5/10 Mhz or with a PIC chip swap 1/5/10/15 MHz. The > TICC has around 100 ps of jitter so you can get 1E-10 resolution at 1 > second... the TICC noise floor at 1000 seconds is less than 1E-13. > > I used the TICC to adjust my 5065A and FTS-4060 cesium C-fields. Referenced > to a 5071A, the results are better than 0.00002 Hz (the spec'd limit of the > devices). > > Attached is a plot of the FTS-4060 using a 5071A as the reference. Over a > 1000 second interval the average frequency is off 0.000002 Hz. This gets one off into the area of “how do I build a 9/10/11/12 digit a second counter?”. As everybody has guessed by now, that’s the project I would do rather than a straight counter. TICC, F7, a dirt cheap FPGA card …. Bob > > Ignore the yellow debug output in the plot... I'm currently working on how > to scale and plot the new MTIE (Maximum Time Interval Error) data that > Heather can now > calculate.<ticc.gif>_______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
