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 AOQLs given in the tables are strictly correct only when the sample is small with respect to the lot.
ASTM B – 90() Standard Test Method of Variables Sampling of Metallic and Inorganic Coatings
A pencil is allowed wstm fall blindly at some number in Table A1. Electrodeposited coatings, Inorganic coatings, Inspection, Inspection and verification, Metallic coating, Paint related coatings, Protective coatings, Sampling.
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. These are explained in Test Method B Bias can be avoided by numbering the articles, randomly selecting a group of numbers equal to aztm sample size, and inspecting the articles with the selected numbers.
The constant interval is determined by dividing the lot size by the sample size and by rounding the quotient down to the nearest whole number.
Such lots will always be accepted. Through the selection of a sampling plan, the potential error is known and controlled. If the test method is destructive, the sample size shall be that directed in 8. Here, a constant interval is maintained between the items drawn for the sample. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
All other items are then awtm at a constant interval following the rst item. Click to learn more.
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. A random number from 1 to 24 is selected either from a table see A1.
Please download Chrome or Firefox or view our browser tips. 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by the responsible technical committee and must be reviewed every ve years and if not revised, either reapproved or withdrawn.
There may be instances in which tighter or looser plans or ones that are more discriminating are desired. This quantity may be a shipment from a supplier, articles that are ready for a subsequent manufacturing operation, or articles ready for shipment to a customer.
If the sample is consistently a signicant part of the lot, the correct AOQL will be smaller than the tabulated value. Formation of Inspection Lot 7. The correct values are obtained by multiplying the tabulated values by the following equation: Often in such cases test specimens are coated along with the articles and are used to represent them in the destructive tests.
Also, some test methods are destructive, in which cases sampling inspection must be used to avoid destroying the lot.
Throughout this method, it is assumed that no mistakes are b062 in sampling, measurement, and calculation. Historical Version s – view previous versions of standard.
Additional plans that may serve these needs are given in Guide B It is also necessary that the variation of the characteristic from article to article in a production lot be normally distributed see Appendix X2. These are explained in Test Method B If the test method to be used is nondestructive, the sample size shall be that directed in 8. A sampling plan is selected that has a high probability of accepting lots of AQL quality and of rejecting lots of LQL quality.
ASTM B602 – 88(2016)
NOTE 4—The acceptability of an inspection lot is determined with respect to each requirement independently from all other requirements. Additional plans that may serve these needs are given in Guide B A sampling plan is selected that will accept most submitted inspection lots of AQL quality and reject most lots of LQL quality. 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.
The fourth plan is intended to be used when the inspection methods are destructive. Inspection and Lot Disposition 9. Sampling plans based on inspection by variables are given in Test Method B60 The constant interval is 24 divided by The possibility exists that some of the uninspected articles are nonconforming.
ASTM B – 88() Standard Test Method for Attribute Sampling of Metallic and Inorganic Coatings
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. The LQL is a quality level that is considered to be barely tolerable. 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.
Active view current version of standard. The plan of Table 4, which is used for destructive testing, is not from the Military Standard.
The sample then consists of articles numbered 31, 20, 8, 26, 53, 65, 64, 46, 22, 6, 41, 67, and