本文件规定了用精梳羊毛或精梳合成纤维制成的条子和粗纱测定纤维长度分布参数（主要是平均长度，用粗纱或倒钩表示，以及测量的变异系数）的方法。 由于不同化学结构的纤维具有不同的双电值，因此该方法不直接适用于由羊毛/合成纤维混合物制成的棉条。

This document specifies a method for the determination of fibre length distribution parameters (principally mean length, expressed as Hauteur or Barbe, and the coefficient of variation of the measurement) on slivers and rovings made from combed wool or combed synthetic fibres. As the fibres of different chemical structure have different di-electric values, the method is not directly applicable to slivers made up of a blend of wool/synthetic fibres.