ASTM B602 PDF
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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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. If one or more of these conditions are not met, a variables plan cannot be used. Take the rst two digits in each group of ve digits. Such lots will always be accepted. The correct values are obtained by multiplying the tabulated values by: Take the smart route to manage medical device compliance.
If it is less, the g602 does not conform. Additional plans that may serve these needs are given in Guide B If the test method to be used is nondestructive, the sample size shall v602 that directed in 8.
For this reason, axtm are no AQL, etc. If only a few articles in an inspection lot wstm 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. Here, a constant interval is maintained between the items drawn for the sample. Using the arithmetic mean of these values, the standard deviation of the process, and the factor k that is found in the Tables, a number is calculated see 9.
Please download Chrome or Firefox or view our browser tips. There may be instances in which tighter or looser plans or ones that are more discriminating are desired.
In these instances the purchaser needs to decide and state whether the tests are to be considered destructive or nondestructive. Also, some test methods are destructive, in which cases sampling inspection must be used to avoid destroying the lot. You may find similar items within these categories by selecting from the choices below:. 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.
Link to Active This link will always route to the current Active version of the standard. There may be instances in which tighter or looser plans or ones that are more discriminating are desired. Some pocket calculators are designed to generate random numbers. There may be instances in which tighter or looser plans or ones that are more discriminating are desired. 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 this is not the case, the correct AOQL will be smaller than the tabulated value. Other tests can destroy the coating in nonessential locations, in which case the item b6602 still be functional. 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.
If the articles are not so mixed, and if it is thought to be impractical to mix them, bias will result if the entire sample is drawn from a single or a few layers.
ASTM B – 88() Standard Test Method for Attribute Sampling of Metallic and Inorganic Coatings
Sampling plans based on inspection by variables are given in Test Method B Through the use of sampling plans, the risk of error is known and controlled. NOTE 4—The acceptability of an inspection lot is determined with respect to each requirement independently from all other requirements.
The AOQLs given in the tables are strictly correct only when the sample is small with respect to the lot. A pencil is wstm to fall blindly at some number in Table A1.
The correct values are obtained by multiplying the tabulated asym by the following equation: If the purchaser does not specify the level, Level II shall be used.
A number in parentheses indicates the year of last reapproval. Sampling plans based on inspection by variables are given in Test Method B Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm.
The number is compared to a maximum allowable.
Historical Version s – view previous versions of standard. Originally approved in Throughout this method, it is assumed that no mistakes are made in sampling, measurement, and calculation. At intermediate quality levels of incoming lots, the average quality level of a series of accepted lots will again be improved, but it will not be improved as much as in either of the above cases; and there will be an intermediate quality level where the degree of improvement is the least.
If every article in an inspection lot is nonconforming, a astj will always indicate that the lot is unacceptable.
They may be replaced with conforming articles. The AQL is the quality level that is considered to be acceptable. Screening is to be used only when required by the purchaser.
The sample then consists of articles numbered 31, 20, 8, 26, 53, 65, 64, 46, 22, 6, 41, 67, and The acceptance number applies to each requirement in turn; it is not added. Inspection and Lot Disposition 9. 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.
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.
ASTM B602 – 88(2016)
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. Instead, an attributes plan must be used.
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