Knowledge
Metrology Dictionary
The complete VIM vocabulary — all numbered concepts of JCGM 200:2012 as faithful paraphrases with clause citations — plus clearly labeled practice terms from the GUM, ILAC, ISO and NIST guidance.
Z-score
A proficiency-testing statistic z = (x − X)/σ_pt comparing a participant result with the assigned value in units of the standard deviation for proficiency assessment; |z| ≤ 2 is conventionally satisfactory.
ISO 13528:2022 · Statistics
Zero adjustment of a measuring system
Adjustment so that the system provides a null indication corresponding to a zero value of the quantity to be measured.
VIM (JCGM 200:2012) 3.12 · Calibration
Zero error
The datum measurement error when the specified measured value is zero.
VIM (JCGM 200:2012) 4.28 · Instruments