這向個指標是客戶對供應商質量臨控的重要指標,特別是在實施6SIGMA的企業,是較為普遍的.
先來看什麼是DPPM?
Dppm是Defective Pieces Per Million 的缩写,一層含義是統計不合格品之DPPM,另外的意思是統計缺陷點之DPPM.
一般RIDPPM & FDPPM 及其計算公式有:
RIDPPM means received incoming-material defective pieces per million
FDPPM means factory defected pieces per million
LAR=(number of incoming lots passed / number of incoming lots checked)×100%
RIDPPM=((Number of incoming seriously unqualified devices+0.3×number of incoming slightly unqualified devices) / number of incoming devices checked)×1000000
FDPPM=( number of devices defected / number of devices used)×1000000
LAR=(Qualified lots / checked lots)×100%
RIDPPM=((Severely unqualified +0.3×slightly unqualified)/sample))×1000000
FIDPPM=(Unqualified products in use / all products in use)×1000000
LAR=(抽樣合格批/抽樣檢驗批)×100%
RIDPPM=((嚴重不合格品數+0.3×輕微不合格品數)/檢驗數))×1000000
FIDPPM=(使用中的來料不合格品數/使用數)×1000000
你不知是什麼意思,具體指什麼?
LAR為Lat Accepted Rate 即批通过率
RIDPPM为Received Incoming Material Defective Pieces Per Million,即指来料的百万分之不良率
FDPPM为Factory Defective Pieces Per Million,即指使用中的百万分之不良率 |