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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Through the selection of a sampling plan, the potential error is known and controlled.
ASTM B602 – 88(2016)
An alternative is rectifying inspection in which rejected lots are screened and used. 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. These are explained in Test Method B The resubmitted lot shall be inspected only for the characteristics for which it was rejected.
Link to Active This link will always route to the current Active version of the standard.
The LQL is a quality level that is considered to be barely tolerable. Often in such cases test specimens sstm coated along with the articles and are used to represent them in the destructive tests.
The correct values are obtained by multiplying the tabulated values by: NOTE 3—The plan given for destructive tests uses smaller samples than the plans given for nondestructive tests. Other bias in sampling, such as taking articles from the same place on a plating rack, taking articles from the output of one electroplating bath and not others, and taking articles that appear to be conforming asym to be nonconforming, must be avoided.
A superscript epsilon e indicates an editorial change since the last revision or reapproval.
The plan of Table 4, which is used for destructive testing, is not from the Military Standard. Worldwide Standards We can source any standard from anywhere in the world. The specic plans selected are identied in Tables g602 this test method. Instead, an attributes plan must be used.
If only a few articles in an inspection lot are nonconforming, the chances are that the sample will indicate that the lot is acceptable; but there is a small chance that the sample will indicate that the lot is unacceptable.
The number is compared to a maximum allowable. Inspection lots that are unacceptable with respect to one or more requirements shall be rejected.
There is no AOQL for the plans used with destructive tests because destructive tests cannot be used to screen rejected lots.
There b6602 be instances in which tighter or looser plans or ones that are more discriminating are desired. The rst item drawn from the lot can be determined from the table of random numbers. It is also necessary that the variation of the characteristic from article to article in a production lot be normally distributed see Appendix X2.
NOTE 2—The nature of a destructive test can be such that the tested article can wstm reclaimed, for example by stripping and reapplying the coating.
ASTM B – 88() Standard Test Method for Attribute Sampling of Metallic and Inorganic Coatings
If the units have serial numbers, the serial numbers can be used. The tables give the AOQL for each plan. Find Similar Items This product falls into the following categories. The AOQLs given in the tables are strictly correct only when the sample is small with respect to awtm lot. If the articles are not so mixed, and if it is thought to n602 impractical to mix them, bias will result if the entire sample is drawn from a single or a few layers.
A number in parentheses indicates the year of last reapproval.
ASTM B – 90() Standard Test Method of Variables Sampling of Metallic and Inorganic Coatings
There may be instances in which tighter or looser plans or ones that are more discriminating are desired. If the standard deviation of the process is not known, the standard deviation of the sample is calculated and used.
If 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. Sampling plans based on inspection by variables are given in Test Method B Sampling plans based on inspection by variables are given in Test Method B It is the asfm of the user of this standard to ast, appropriate safety and health practices and determine the asrm of regulatory limitations prior to use.
In accordance with Table 3, a sample of items is to be drawn. These are explained in Test Method B The specific plans selected are identified in Tables 1- 3 of this test method.
If the test b60 to be used is nondestructive, the aastm size shall be that directed in 8. All other items are then drawn at a constant interval following the rst item. This quantity may be a shipment from a supplier, articles that are ready for a b62 manufacturing operation, or articles ready for shipment to a customer. It is the worst condition that can occur under rectifying inspection. Through the use of sampling plans, the risk of error is known and controlled.
You may find similar items within these categories by selecting from the choices below:. Sampling plans based on inspection by variables are given in Test Method B The plan of Table 4, which is used for destructive testing, is not from the Military 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.
If the pencil falls on column 10, line 11, and the coin is tails, the decision is to read down the column until 13 numbers are chosen. Such lots will always be aastm.