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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There may be cases in which destruction of even these smaller quantities is undesirable. NOTE 2—The nature of a destructive test can be such that the tested article can be reclaimed, for example by stripping and reapplying the coating. 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.
Last previous edition approved in as B — 88 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 plan of Table 4, which is used for destructive testing, is not from the Military Standard. This website is best viewed with browser version of up to Microsoft Internet Explorer 8 or Firefox 3.
Formation of Inspection Lot 7. Sampling plans based on inspection by variables are given in Test Method B Worldwide Standards We can source any standard from asttm in the world.
Please download Chrome or Firefox or view our browser tips. 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)
If this number equals or exceeds the specified minimum, the inspection lot conforms to the requirements. Referenced Documents purchase separately The documents listed below are aastm within the subject standard but are not provided as part of the standard. The articles are numbered 1 through If the test method is destructive, the sample size shall be that directed in 8.
If every article in an inspection lot conforms to its requirements, every article in the sample will conform also. Often in such cases test specimens are coated along with the articles and are used to represent them in the destructive tests.
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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. For example, the articles may be expensive or the inspection lot may be small. 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.
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In h602 instances the purchaser needs to decide and state whether the tests are to be considered destructive or nondestructive. 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.
When a test is neither clearly nondestructive nor destructive see Note 2, 8. When incoming lots are of a poor quality level, the average quality of a series of lots will again be good because many of the incoming lots will be rejected and upgraded. Inspection lots that are unacceptable with respect to one or more requirements shall be rejected.
Bias can be avoided by numbering the articles, randomly selecting a group astk numbers equal to the b62 size, and inspecting the articles with the selected numbers. If the test v602 to be used is nondestructive, the sample size shall be that directed in 8.
Sampling plans based on inspection by variables are given in Test Method B This standard does not contain the Military Standard’s requirement for tightened inspection when the quality history of a supplier is unsatisfactory. Signicance and Use 4. The fourth plan is intended to be used when the inspection methods are destructive.
The correct values are obtained by multiplying the tabulated values by: For example, every 9th, 19th, or 24th unit is selected. Satm you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards, at the address shown below. For this reason, there are no AQL, etc. 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.
ASTM B – 90() Standard Test Method of Variables Sampling of Metallic and Inorganic Coatings
Additional plans that may serve these needs are given in Guide B Other bias in sampling, such as taking articles from the same zstm on a plating rack, taking articles from the output of one electroplating bath and not others, and taking articles that appear to be conforming or to be nonconforming, must be avoided. It is the responsibility of the user of this satm to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
The correct values are obtained by multiplying the tabulated values by the following equation: For this reason, there are no AQL, etc. The larger the sample, the smaller this risk, but, the larger the cost of inspection. Throughout this method, it is assumed that no mistakes are made in sampling, measurement, and calculation.
Also, Guide B describes the nature of attribute sampling plans and the b062 factors that must be considered in the selection of a sampling plan.