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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For this reason, there are no AQL, etc. Therefore, basic to any sampling inspection plan is the willingness of the buyer to accept lots that contain some nonconforming articles. Historical Version s – view previous versions of standard.
The fourth plan is intended to be used when the inspection methods are destructive. A number in parentheses indicates the year of last reapproval. The correct values are obtained by multiplying the tabulated values by: Through the selection of a sampling plan, the potential error is known and b6002. The poorest average quality level that can result asym the use of a given sampling plan when screening of rejected lots is done is called the Average Outgoing Quality Limit AOQL.
ASTM B602 – 88(2016)
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. B — 88 5.
The rst item drawn from the lot can be determined from the table of random numbers. If every article in an inspection lot is nonconforming, a sample will always indicate that the lot is unacceptable.
If the purchaser does not aastm the level, Level II shall be used. The articles are numbered 1 through Some pocket calculators are designed to generate random numbers. The AQL is the quality level that is considered to be acceptable.
Often in such cases test specimens are coated along with the articles and are used to represent them in the destructive tests. These are explained in Test Method B Current edition approved May 15, For example, if a sample of 50 articles drawn in accordance with Table 2 is found to contain aetm defectives with respect to thickness and a third one with respect to appearance, the inspection lot is acceptable because although three articles were defective no more than two, the acceptance number, were defective with respect to a single requirement.
ASTM B – 90() Standard Test Method of Variables Sampling of Metallic and Inorganic Coatings
Search all products by. The larger the proportion of nonconforming articles in an inspection lot, the more likely it will be that the sample will indicate that the lot is unacceptable.
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.
Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility. When incoming lots are of a poor quality level, the average quality of a series of accepted lots will again be good because many of the incoming lots will be rejected and upgraded.
There is always a risk that a random sample will not describe correctly the characteristics of the lot from which it is drawn, and that an unacceptable lot will be accepted or an acceptable lot will be rejected. Additional plans that may serve these needs are given in Guide B The correct values are obtained by multiplying the tabulated values by the following equation: A table of random numbers Table A1.
A characteristic of the coating on the drawn articles is measured. The constant interval is 24 divided by NOTE 3—The plan given for destructive tests uses smaller samples than the adtm given for nondestructive tests.
ASTM B – 88() Standard Test Method for Attribute Sampling of Metallic and Inorganic Coatings
Link to Active This link will always route to the current Active version of the standard. 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. 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.
These are explained in Test Method B The selection of random numbers is made as follows: Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm. Instead, an attributes plan must be used.
The resubmitted lot shall be inspected only for the characteristics for which it was rejected. Based on the results, a decision is made whether or not the lot conforms to the requirements.