[time-nuts] V standards

Tom Van Baak tvb at LeapSecond.com
Thu Dec 11 18:55:12 UTC 2008


Mark Sims writes:
> I am a bit of a mass nut (OK I have a LOT of digital scales
> with resolutions down to a nanogram and up to 60Kg with
> 0.01g res).  Many of the industrial scales require you to
> enter your lat/lon/altitude (or at least your general location)
> so they can better model and compensate for gravity.
> A 3 meter (1 story in a building) change in altitude affects
>gravity by 1 part/million...  easily noticeable on even a modest
> analytical balance.  Modern lab balances can easily resolve
> 1 part in 20 million.  The better ones exceed 1 part in 100 million.
> Industrial scales can do 1 part per million of max capacity...
> not too shabby for a mass to digital converter.

Mark,

That's very cool that they would model static gravity effects like
that. Makes sense at that level of resolution.

Do you know of any laboratory scales that also require you
to enter the date/time so they can also model the dynamic
0.1 ppm effect on gravity of lunar/solar tides?

/tvb




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