本文件描述了一种使用电容测量设备来确定沿纺织线长度的线密度不均匀性的方法。 该方法适用于由天然纤维或人造纤维制成的毛条、条子、粗纱、纺纱和连续长丝纱，短纤维股的毛条范围为4 tex（g/km）至80 ktex（kg/km），连续长丝纱的毛条为1 tex（g/kkm）至600 tex（g/km）。它不适用于花式纱线或完全或部分由金属等导电材料组成的股线；后者需要光学传感器（见A.4）和根据特定标准测试的生丝。 该方法描述了方差长度曲线的制备以及线性密度周期性的确定。 它还包括纱线中的缺陷计数，即棉结和粗细部位。

This document describes a method, using capacitance measuring equipment, for determining the unevenness of linear density along the length of textile strands. The method is applicable to tops, slivers, rovings, spun yarns and continuous filament yarns, made from either natural or man-made fibres, in the range of 4 tex (g/km) to 80 ktex (kg/km) for staple-fibre strands and 1 tex(g/km) to 600 tex (g/km) for continuous-filament yarns. It is not applicable to fancy yarns or to strands composed fully or partly of conductive materials such as metals; the latter requires an optical sensor (see A.4), and to raw silk filaments which are tested according to a specific standard. The method describes the preparation of a variance-length curve, as well as the determination of periodicities of linear density. It also covers the counting of imperfections in the yarn, namely of neps and of thick and thin places.