[time-nuts] IEEE Spectrum - Dec 2017 - article on chip-scale atomic frequency reference

Bob kb8tq kb8tq at n1k.org
Sat Dec 9 18:33:06 EST 2017


Hi

If the frequency sensitivity is 1x10^-13 / G you don’t need a lot of precision
in your measurement of G. The same issues apply to things like magnetic 
field and the rest. 

Bob

> On Dec 9, 2017, at 4:02 PM, Chris Caudle <chris at chriscaudle.org> wrote:
> 
> On Sat, December 9, 2017 2:39 pm, Magnus Danielson wrote:
>> The standard acceleration is internationally agreed at 3rd CGPM in 1901
>> to be 9.80665 m/s^2.
> 
> So does that mean e.g. NIST and BIPM need to measure the acceleration at
> their respective locations to within parts in 10^17 or 10^18 in order to
> compare their frequency standards?
> That seems not practical.
> -- 
> Chris Caudle
> 
> 
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