Draft International Standard
ISO/DIS 13909-7
Coal and coke — Mechanical sampling — Part 7: Methods for determining the precision of sampling, sample preparation and testing
Reference number
ISO/DIS 13909-7
Edición 3
© ISO 2024
Draft
International Standard
En desarrollo
Este borrador de Norma Internacional se encuentra en la fase de consultas con los miembros de ISO.
Reemplazará ISO 13909-7:2016

Resumen

In ISO 13909-7:2016, formulae are developed which link the variables that contribute to overall sampling precision. Methods are described 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.

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