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The Special Inspection Levels in the AQL Tables

April 9, 2019

The Special Inspection Levels in the AQL Tables

A few years ago I wrote about the inspection levels, but I regularly notice that some people are confused about the "special" levels (S1, S2, S3, and S4). Here is what the ISO 2859-1 standard says (emphasis is mine): The inspection level designates the relative amount of inspection. Three inspection levels, I, II and III, are given in Table 1 for general use. Unless otherwise specified, level II shall be used. Level I may be used when less discrimination is needed or level III when greater … [Read more...]

Filed Under: Quality Control Tips Tagged With: AQL, Aql Tables, inspection levels, special inspection levels


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