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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This standard is subject to revision at any time by the responsible technical committee and must be reviewed every ve years and if not revised, either reapproved or withdrawn.
The selection of random 6b02 is made as follows: Also, some test methods are destructive, in which cases sampling inspection must be used to avoid destroying the lot. A table of random numbers Table A1. At intermediate quality levels of incoming lots, the average quality level of a series of lots will not be as good as b6022 either of the above cases.
Historical Version s – view previous versions of standard. Based on the results, a decision is made whether or not the lot conforms to the requirements.
If it is less, the lot does not conform. These are explained in Test Method B There may be cases in which destruction of even these smaller quantities is undesirable. This standard does not contain the Military Standard’s aetm for tightened inspection when the quality history of a supplier is unsatisfactory. Therefore, basic to any sampling inspection plan is the willingness of the buyer to accept aastm that contain some nonconforming articles.
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 resubmitted lot shall be inspected only for the characteristics for which it was rejected. Here, a constant interval is maintained between the items drawn for the sample.
ASTM B – 88() Standard Test Method for Attribute Sampling of Metallic and Inorganic Coatings
So the selection of a sampling plan involves the balancing of the costs of inspection against the consequences of accepting an undesirable number of nonconforming articles.
In the extreme case of every article in an inspection lot being nonconforming, a sample will always indicate that the lot is unacceptable. A characteristic of the coating on the drawn articles is measured. For example, every 9th, b60, or 24th unit is selected. 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. In these instances the purchaser needs to decide and state whether the tests are to be considered destructive or nondestructive.
If every article in an inspection lot conforms to its requirements, every article in the sample will conform also. This may be done by placing the units in racks or trays where the positions in the racks are numbered. It is the responsibility of the user of this standard to sstm appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
ASTM B602 – 88(2016)
It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. If the test method to be used is nondestructive, the sample size shall be that directed in 8. Current edition approved May 15, A superscript epsilon e indicates an editorial change since the last revision or reapproval. This website is best viewed with browser version of up to Microsoft Internet Explorer 8 or Firefox 3.
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. The plan of Table 4, astj is used for destructive testing, is not from the Military Standard.
After the rst item is taken, the remaining items in the required sample are drawn by selecting every 24th item from the lot until are selected. There may be instances in which tighter or looser plans or ones that are more ast, are desired. A sampling plan is selected that will accept most submitted inspection lots of AQL quality and reject most lots of LQL quality.
ASTM B – 90() Standard Test Method of Variables Sampling of Metallic and Inorganic Coatings
The plan of Table 4, which is used for destructive testing, is not from the Military Standard. Inspection and Lot Disposition 9. Through the selection of a sampling plan, the potential error is known and controlled. Originally approved in 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. Throughout this method, it is assumed that no mistakes are made in sampling, measurement, and calculation.
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