Coal and coke — Mechanical sampling — Part 7: Methods for determining the precision of sampling, sample preparation and testing
NORMA vydaná dňa 22.7.2025
Designation standards: ISO 13909-7:2025-ed.3.0
Publication date standards: 22.7.2025
The number of pages: 42
Approximate weight : 126 g (0.28 lbs)
Country: International technical standard
Kategória: Technické normy ISO
Description / Abstract: This document defines methods for estimating overall precision and for deriving values for primary increment variance which can be used to modify the sampling scheme to change the precision. Methods for checking the variance of sample preparation and testing are also described. In this document, formulae are developed which link the variables that contribute to overall sampling precision.