（ISO 13909-7-2016），英文名为Hard coal and coke -- Mechanical sampling -- Part 7: Methods for determining the precision of sampling, sample preparation and testing。
它（ISO 13909-7-2016）是在2016-07-01发布，在2016-07-01开始实施。
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.
本标准文件共有50页。 ISO 13909-7-2016 Hard coal and coke -- Mechanical sampling -- Part 7_ Methods for determining the precision of sam.pdf(1.09 MB)
