【摘要】 本文用理论推导得出:以250m 作为试样长度,用其所测定的短片段不匀率值替代纱条总不匀率值,是合理的。并且导出了取小于250m 长度片段L_W 时,所测定的CV%（变异系数）值占总不匀率的比率γ的关系式γ=（[1-（（?）/L_W）ⁿ]/[1-（（?）/250）ⁿ]）^1/2。作者应用电容式电子均匀度仪测定纱条短片段不匀率时,根据γ值的计算,认为棉纱和毛纱分别选取200m和100m 长度所测得的CV%值已足够精确。更多还原

【Abstract】 Through theoretical treatment,the authors suggest that a samlpe length of 250 meters isreasonable or taking the value of short term evenness as the total evenness of the yarn,anddeduce a formula to express he relation between the CV% of the sample L_w which is lessthan 250 meters,and the total evenness as ollows:γ=（[1-（（?）/Lw）²]/[1-（（?）/250）ⁿ]）^1/2When an electrical evenness detector of capacity type is sed to measure the evenness ofshort term,according to the value of γ,the CV% of the sample with a length f 00 metersfor cotton yarn and 100 meters for wool yarn is precise enough to meet the requirement.更多还原