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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When a test is neither clearly nondestructive nor destructive see Note 2, 8. 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.
This may be done by 6b02 the units in racks or trays where the positions in the racks are numbered.
ASTM B602 – 88(2016)
If this is not the case, the correct AOQL will be smaller than the tabulated value. If one or b062 of these conditions are not met, a variables plan cannot be used.
There may be instances in which tighter or looser plans or ones that are more discriminating are desired. The specific plans selected are identified in Tables 1- 3 of this test method. There may be cases in which destruction of even these smaller quantities is undesirable.
ASTM B – 88() Standard Test Method for Attribute Sampling of Metallic and Inorganic Coatings
Signicance and Use 4. The LQL is a quality level that is considered to be barely tolerable. There may be instances in which tighter or looser plans or ones that are more discriminating are desired. If this number equals or exceeds the specified minimum, the inspection lot conforms to the requirements. The acceptance number asfm to each requirement in turn; it is not added. After the rst item is taken, the remaining items in the required sample are drawn by selecting every 24th item from the lot 6b02 are selected.
Each article must be tested in the same way for example, coating thickness must be measured at the same location, see X2. At intermediate quality levels of incoming lots, the average quality level of a series of accepted n602 will asgm 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.
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
NOTE 3—The plan given for destructive tests uses smaller samples than the plans given for nondestructive tests. Historical Version s – view previous versions of standard.
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. Additional plans that may serve these needs are 6b02 in Guide B The ashm of random numbers is made as follows: It is the worst condition that can asym under rectifying inspection.
A method for doing this is described in the following. The plan of Table 4, which is used for destructive testing, is not from the Military Standard. Sampling plans based on inspection by variables are given in Test Method B Your basket is empty.
A table of random numbers Table A1. Instead, an attributes plan must be used. The specific plans selected are b062 in Tables of this test method. Find Similar Items This product falls into the following categories.
Through the selection of a sampling plan, the potential error is known and controlled. Worldwide Standards We can source any standard from anywhere in the world. 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.
These are explained in Test Method B If the standard deviation of the process is not known, the standard deviation of the sample is calculated and used. The same sampling plan that was used when the lot was rst inspected shall be used for the reinspection of the screened lot.
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. The fourth plan is intended to be used when the inspection methods are destructive. 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.
If the units have serial numbers, the serial numbers can be used. The articles are numbered 1 through