This standard is issued under the fixed designation B; the number 1 This test method is under the jurisdiction of ASTM Committee B08 on Metallic. ASTM B_机械/仪表_工程科技_专业资料。 Designation: B – 88 ( Reapproved ) Standard Test Method for Attribute Sampling. Purchase your copy of ASTM B – 88() as a PDF download or hard copy directly from the official BSI Shop. All BSI British Standards.
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Such lots will be accepted Note 1. For this reason, there are no AQL, etc.
These are explained in Test Method B In these instances the purchaser needs to decide and state whether the tests are to be considered destructive or nondestructive. Also, Guide B describes the nature of attribute sampling plans and the several factors that must be considered in the selection of a sampling plan.
This last plan utilizes smaller samples and so reduces the cost of inspection but with a sacrice in the ability to distinguish between acceptable and unacceptable lots. A random number from 1 to 24 is selected either from a table see A1.
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If corrective action b062 taken by the supplier so that there is a low rejection rate of initially supplied lots, the average quality level will be better than the AOQL Note 1. For example, the articles may be expensive or the inspection lot may be small.
The values obtained are used to estimate the number of articles in the lot that do not conform to a numerical limit, for example a minimum thickness. If only a few articles in an inspection lot are nonconforming, the sample probably will indicate that the lot is acceptable; but there is a small probability that the sample will indicate that the lot is unacceptable. The same sampling plan that was used when the lot was rst inspected shall be used for the reinspection of the screened lot.
Historical Version s – view previous versions of standard.
NOTE 4—The acceptability of an inspection lot is determined with respect to each requirement independently from all other requirements. Link to Active This link will always route to the current Active version of the standard.
ASTM B – 88() Standard Test Method for Attribute Sampling of Metallic and Inorganic Coatings
Therefore, basic to any sampling inspection plan is the willingness of the buyer to accept lots that contain some nonconforming articles. It is also necessary that the variation of the characteristic from article to article in a production lot be normally distributed see Appendix X2. If the units have serial numbers, the serial numbers can be used.
There may be cases in which destruction of even these smaller quantities is undesirable. Instead, an attributes plan must be used.
ASTM B602 – 88(2016)
Historical Version s – view xstm versions of standard. When the incoming lots are of a good quality level, the average quality level of a series of lots will be even better when the rejected lots are screened and resubmitted.
The plan of Table 4, which is used for destructive testing, is not from the Military Standard. There may be instances in which tighter or looser plans or ones that are more discriminating are desired. If this is not the case, the correct AOQL will be smaller than the tabulated value. Variables plans are applicable when a test yields a numerical value for a characteristic, when the specification imposes a numerical limit on the characteristic, and when certain statistical criteria are met.
The plan of Table 4which is used for destructive testing, is not from the Military Standard.
One of these Table 2 is considered to be standard and is the one that is followed unless the user of this method species either a higher quality level Table 1 or a lower one Table 3. The acceptance number applies to each requirement in turn; it is not added. It is the worst condition that can occur under rectifying inspection.