WP-34S galUS-> l Precision

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(12-16-2016 08:31 PM)matthiaspaul Wrote:  It's a pity that we cannot already incorporate the changes necessary for the forthcoming CODATA 2018 and the proposed "new SI"... ;-)

However, I'm sure we'll manage to update the WP 34s and newRPL when the time comes, and the HP Prime will probably be updated by HP as well. I'm a bit worried, however, if we'll manage to update the HP 50g as well in 2018... After all, there isn't even an up-to-date version of the periodic table.

Greetings,

Matthias

Unfortunately those neat pictures do not reveal the dependency of measurement of those new reference definition umm.. matters.

I like the old ampere definition the most, infinitely long and infinitely thin lines separated by one meter and current is applied which is equivalent to one ampere, when the force between the wires reaches 2 × 10−7 Newtons (N = Kg * m/s^2). So in the past there were two wires one atom of diameter each from here to sun with distance of one meter between and somewhere on the orbit of mercury there were a Nist technician measuring the force of those lines with his or her spring forcemeter.

The new system seems to be floating entirely, there is no ground point? By that I mean each reference is [I assume since I have not read all those reference ( I should be sleeping by now )] measured by electronic devices which are calibrated with each other, how they be certain that they are not creating a system that is drifting by time since with a quick look every reference point is as the ampere definition, something atomic scale that needs a long line of accurate measurements containing the other reference to create a device to get those atomic level scales. While the references themselfs should be constants. Oh, well science. It will be interesting to see is there any correlation in gold prices if and when this new system is on working state. Time to go to sleep, haha.

Edit. : Brains were a bit overdone last night it seems. One thing the bureaus of measurement and units lack they have no good general level publications (assuming since there were no mention on Mikes site) about the actual measurement system and how it is maintained behind the doors etc (lack of explatatory information is general achilles heel of many sciences). Just searched through Mikes (Finnish national measurement laboratory, holds the current meter replica n.23 ) and there weren't single easy to read explanatory level publication about the work they do ( while there is plenty of good ones of practical use of their work ). They organise courses in some narrow subjects, but yeah cost is hundrets of euros per head.