[time-nuts] Primary Time Standards

[Tom Van Baak (lab/iPad)]

> Absolutely, but you can still pull a new Cs out of the box and it will
> run at the same frequency as your old Cs.

Not quite "the same". This is called the re-trace spec which is poorer than the stability spec. Vintage Cs standards like the 5060 or 5061 powered up within about 1e-10 or 1e-11. The 5071A retrace spec (called reproducibility in the data sheet) is 1e-13.

/tvb