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 sample, the smaller this risk, but, the larger the cost of inspection. Search all products by.
If only a few articles in an inspection lot are 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. The same sampling plan that was used when the lot was rst inspected shall be used for the reinspection of the screened lot. Variables plans are applicable when a test yields a numerical value for a characteristic, when the specication imposes a numerical limit on the characteristic, and when certain statistical criteria are met.
Through the selection b62 a sampling plan, the potential error is known and controlled. The larger the sample, the smaller this risk but the larger the cost of inspection.
ASTM B – 90() Standard Test Method of Variables 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. 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. It is the b60 condition that can occur under rectifying inspection.
Such lots will always be accepted. 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. 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.
There may be cases in astmm destruction of even these smaller quantities is undesirable.
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 sstm are more discriminating are desired.
Variables plans are applicable when a test yields a numerical value for a characteristic, when the specification imposes a numerical limit on the characteristic, and when certain statistical criteria are met. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.
There is no AOQL for the plans used with destructive tests because destructive tests cannot be used to screen rejected lots. A superscript epsilon e indicates an editorial change since the last revision or reapproval. Bias can be avoided by numbering the articles, randomly selecting a group of numbers equal to the sample size, and inspecting the articles with the selected numbers.
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.
Through the use of sampling plans, the risk of error is known and controlled. NOTE ast, nature of a destructive test can be such that the tested article can be reclaimed, for example by stripping and reapplying the coating. Please download Chrome or Firefox or view our browser tips. The resubmitted lot shall be inspected only for the characteristics for which it aetm rejected. The plan of Table 4which is used for destructive testing, is not from the Military Standard.
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.
There may be instances in which tighter or looser plans or ones that are more discriminating are desired. A table of random numbers Table A1.
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Link to Active This link will always route to the current Active version of the standard. The faster, easier way to work with standards. This may be done by atm the units in racks or trays where the positions in the racks are numbered. 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. 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.
Other tests can destroy the coating in nonessential locations, in which case the item can still be functional. Instead, an attributes plan must qstm used. The correct values are obtained by multiplying the tabulated values by: These are explained in Test Method B Historical Version s – view previous versions of standard. Random sampling procedures are given in the Annex of this test method. Three are intended to be used when the inspection methods are nondestructive.
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. The tables give the AOQL for each plan. Therefore, basic to any sampling inspection plan is the willingness of the buyer to accept lots that contain some nonconforming articles. 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 Accept and continue Learn more about the cookies we use and how to change your settings. The correct values are obtained by multiplying the tabulated values by the following equation: If the purchaser does not specify the level, Level II shall be used.
ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard.