suurusele kindlal eesmärgil leppeliselt omistatud väärtus
kalibreerimistoimingus kasutatava etaloni mõõteväärtus, mille määramatus on kalibreeritava mõõtevahendi määramatusega võrreldes tühine
quantity value attributed by agreement to a quantity for a given purpose
measure-value of a standard used in a calibration operation and known with uncertainty negligible with respect to the uncertainty of the instrument to be calibrated
Suuruse leppeväärtuseks on nt vabalangemiskiirenduse standardväärtus (varem ”gravitatsiooniline standardkiirendus”), gn = 9,806 65 m·s−2, Josephson’i konstandi leppeväärtus, KJ-90 = 483 597,9 GHz·V−1 ja konkreetse etalonvihi massi leppeväärtus, m = 100,003 47 g.
Good to know
"Suuruse leppeväärtus" jaoks kasutatakse vahel terminit “suuruse tõeline leppeväärtus”, kuid selline kasutus on ebasoovitatav. Vahel on suuruse leppeväärtus suuruse tõelise väärtuse hinnang. On üldtunnustatud, et suuruse leppeväärtusega kaasneb sobivalt väike mõõtemääramatus, mis võib olla ka null.
A conventional quantity value is to example standard acceleration of free fall (formerly called “standard acceleration due to gravity”), gn = 9,806 65 m · s−2, conventional quantity value of the Josephson constant, KJ-90 = 483 597,9 GHz · V−1 and conventional quantity value of a given mass standard, m = 100,003 47 g.
Good to know
The term “conventional true value of a quantity” is sometimes used for this concept, but its use is discouraged. Sometimes a conventional quantity value is an estimate of a true quantity value: A conventional quantity value is generally accepted as being associated with a suitably small measurement uncertainty, which might be zero.
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