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

Magnus Danielson magnus at rubidium.dyndns.org
Sat Dec 9 16:15:27 EST 2017


Hi,

On 12/09/2017 10:02 PM, Chris Caudle 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.

No, you have a large scale-factor so you really don't need that much of 
precision to achieve it.

Cheers,
Magnus


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