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ISO 2859-4-2002 pdf free
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ISO 2859-4-2002 pdf free.Sampling procedures for inspection by attributes – Part 4: Procedures for assessment of declared quality levels.
This part of ISO 2859 establishes sampling plans and procedures that can be used to assess whether the quality level of an entity (lot, process, etc) conforms to a declared value. The sampling plans have been devised so as to obtain a risk of less than 5 % of contradicting a correct declared quality level. The risk is 10 % of failing to contradict an incorrect declared quality level which is related to the limiting quality ratio (see clause 4). Sampling plans are provided corresponding to three levels of discriminatory ability.
In contrast to the procedures in the other parts of ISO 2859, the procedures in this part of ISO 2859 are not applicable to acceptance assessment of lots. Generally, the balancing of the risks of reaching incorrect conclusions in assessment procedures will differ from the balancing in the procedures for acceptance sampling.
This part of ISO 2859 may be used for various forms of quality inspection in situations where objective evidence of conformity to some declared quality level is to be provided by means of inspection of a sample. The procedures are applicable to entities such as lots, process output, etc. that allow random samples of individual items to be taken from the entity.
The sampling plans provided in this part of ISO 2859 are applicable, but not limited, to inspection of a variety of
products such as
— end items;
— components and raw materials;
— operations;
— materials in process;
— supplies in storage:
— maintenance operations:
— data or records;
— administrative procedures.
The procedures are primarily intended to be usea when me quantity OT interest is me numoer or raciion 01 nonconforming items for which the inspected items are classified as conforming or nonconforming.
With minor changes, the procedures may also be used when the quantity of interest is the number of nonconformities or number of noncontormities per item. The necessary changes are:
— replacement of “number of nonconforming items” by Thumber of nonconformities;
— replacement of percent nonconforming items” by ‘nonconformities per 100 items”.
In this case the values given in Tables 2 to 7 are only approximations.ISO 2859-4 pdf download.


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