AQL is widely used in product quality testing in various industries, and different AQL standards are suitable for testing different substances. In AQL sampling, the number of samples is the same. The smaller the value after AQL, the fewer defects are allowed, indicating that the higher the quality requirements, the stricter the inspection.
AQL (Acceptable Quality Level) is the basis of adjustable sampling system, and it is the upper limit of the process average value of continuously submitted inspection lots agreed by both parties. The process average is the average quality of a series of continuously submitted inspection lots, which is expressed by "batch failure rate" or "defective rate per 100 unit".
AQL and sample size (the so-called sample size can be understood as "sample size" or sample size? ) lies in the conversion between one inspection level (three general inspection levels I, II and III, and four special inspection levels S- 1, S-2, S-3 and S-4) and the severity.
Extended data:
Introduction to AQL detection:
1, unit product inspection: the basic unit divided for inspection needs. Inspection lot: a batch of unit products to be inspected. Short for batch processing. There should be no essential difference between the unit products that make up the inspection lot, but they just fluctuate randomly. Therefore, an inspection lot should be composed of the same type and grade of unit products produced under basically the same production conditions and in about the same period.
2. Batch inspection: the unit product quantity contained in a batch of products to be inspected.
3. Fatal defects: defects that may cause harm or unsafe conditions to the use and maintenance of products or related personnel; Or damage the important and final basic function of the product.
4. Serious defects: defects that are different from fatal defects, but can lead to product failure or significantly reduce the expected performance of products.
5. Mild defects: defects that will not significantly reduce the expected performance of the product, or defects that deviate from the standard but only slightly affect the effective use or operation of the product.
6. Product inspection classification: full inspection, sampling inspection, incoming inspection, intermediate inspection, finished product inspection, ex-factory inspection, inventory inspection, supervision inspection, counting inspection, measurement inspection, destructive inspection and nondestructive inspection.
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