Coal and coke — Mechanical sampling — Part 7: Methods for determining the precision of sampling, sample preparation and testing
NORMA vydána dne 22.7.2025
Označení normy: ISO 13909-7:2025-ed.3.0
Datum vydání normy: 22.7.2025
Počet stran: 42
Přibližná hmotnost: 126 g (0.28 liber)
Země: Mezinárodní technická norma
Kategorie: 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.