[time-nuts] Is my Cs C-Field set OK or do I need to take more data?

Doug Hogarth doug at niceties.com
Sun Jan 9 21:26:59 EST 2005


Maybe I'm missing something, but I would collect more data and not worry
about the C-field (frequency offset) at this time.
I'd focus on the ~80ns peak-to-peak that you saw over 10k seconds vs
GPS-disciplined Rb.
That seems too large, so experiment with things like different loop
constants, verify triggering, consider temporarily turning off the
displining, etc.

-----Original Message-----
For the last few days I've been tweaking the C Field setting on a FTS
4060/S24.  Here's some data taken using the 1 PPS output of a GPS
disciplined Rb oscillator (PRS10) as the "A" trigger input to an SR 620 TI
counter.  The "B" stop input is the 1 MHz output from the Cs source.
http://www.pacificsites.com/~brooke/pdf/sn1013_C-Field.pdf






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