Downloaded from https://www.everyspec.com 100 SINGLE S=fftt SAMPLING I, DOUBLE SSAMPLING __ L MULTIPLE SAMPLING " -. 01 0 2 3 4 5 P a PERCENT DEFECTIVE Figure 5-4. Avernge Sampole WNmber (ASN) curves for plans shown in figure 5-3 * The effect of varying the sample size can be the disposition of his lots. The manufacturer observed by noting figures 5-6 and 5-7. Oh- will know that by submitting products as good viousiy the greater the sample size, the usore an, or better than, the AQL, rejections can be stringent and more discriminating will the plan kept to an absolute minimum. If the manufac- be for a fixed acceptance number.
Similarly, turer produces worse than AQL level, many for a fixed sample size, the severity of the plan inspection lots will be rejected, with increased increases as the acceptance number decreases costs necessary to screen or to scrap the lots. (figure 5-9). On the other hand, a production quality level better than the AQL may invoLve higher pro- 5-15. Acceptable Quality Level as Basis for duction costs than are necessary. The know- gig Usually, the effect of a sampling ledge of the AQL level will enable the producer plan for acceptance inspection is to force man- to manufacture most efficiently.
ufacturers to supply materiel of such good qual- ity that only a very small proportion of the lots If some point other than the AQL is set as a is rejected. The manufacturer, when given the basis for inspection, the acceptable quality level AQL, knows the numor piece of informationper- will differ among manufacturers, depending on taming to the sampling plans, which will affect the particular sampling plan used. SA-8