spc統(tǒng)計(jì)過(guò)程控制與ipc-wenkub
2023-03-11 04:09:43 本頁(yè)面
【正文】 n factor The correction factor is used only when: n/N5% SPCadvanced training course Example: 10 ohm resistors are manufactured in batches of 500, and 50 resistors are tested in each batch. If the mean resistence of the sample is less than , the batch is rejected. With μ =10ohms σ =1ohms, what is the probability that the batch will be rejected? μ σ x Solution: N=500, n=50, X= σ x = σ n Nn N1 = * = σ x Z= X μ = =10 =1 Z= Area= P ===% Reject Reject SPCadvanced training course (Y1+Y2+Y3+Y4+Y5)/5=Mean Look at the Sigma difference:Sigmax=Sigma/SQRT(5) SPCadvanced training course y1 y2 y3 y4 y5 y6 y7 y8 y9 y10 1 2 3 4 5 Min Max Range Mean R= Estimated Sigma= R/d
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