ppm: Parts Per Million,百萬分之率,10−6 ppb: Parts Per Billion, 十億分之一,10−9 ppt: Parts-Per-Trillion,兆分之一,10−12 ppq: Parts-Per-Quadrillion,千兆分之一,10−15 DPMO:Defect Per Million Opportunity,百萬不良率,也就是指抽樣一百萬個樣品檢查出現不良品的機率,當抽樣數越大,其結...