This document establishes single sampling plans for conformance testing, i.e., for assessing whether the quality level of a relevant audit population (lot, process, inventory, file etc) conforms to a declared value. Sampling plans are provided corresponding to four levels of discriminatory ability.
AQL
TSI's inspectors use the MIL-STD-105Etables (also known as AQL tables) to measure acceptable levels of quality of the products they inspect. This method is widely used by the inspection profession to determine whether to accept a production batch without checking every single item of the batch. Besides AQL, other similar standards such as ANSI/ASQC Z1.4, ISO 2859, NF06-022, BS 6001, and DIN 40080 have been used by different nations and international standardization organizations.
Batch/Lot
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A batch or lot is a collection of products – all identical in size, type, conditions and time of production – from which a sample will be taken to determine whether the batch conforms to the acceptance level.
Acceptance Sampling
Acceptance Sampling is used to decide whether to accept or reject a production lot: select samples from the production lot and inspect the units in the sample, then use the result to determine whether to accept or reject the lot.
General Sampling Level
The Sampling Level represents the overall accuracy level of the Sampling Method. For a given lot size, increasing the Sampling Level means increasing the Sample Size.
Mac miller jet fuel mp3 download free. There are three General Sampling Levels: I, II, or III. TSI's default Level is II.
Special Inspection Level
Special Inspection Level is used instead of the General Inspection Level when there are special requirements for the inspection. There are four special inspection levels: S1, S2, S3 and S4.
Iso 2859-4 Sampling Standard
Samples size code letter
The code letter is based on lot size and inspection level.
Iso 2859 Sampling Standard
Sampling size
The sampling size is the total number of units to be inspected.
AQL and defect classification
Defect classification
Defects detected during inspections are generally classified in 3 categories:
- Critical defect
- Major defect
- Minor defect
Critical defect: critical defect is likely to result in hazardous or unsafe conditions for using and/or maintaining the product. We generally set the acceptable critical defect level at 0.
Major defect: major defect does not affect safety of the product, but affects the product's performance. We generally set the acceptable major defect level at 2.5.
Minor defect: minor defect will not affect normal use of the product. The defect is usually the result of less than satisfactory workmanship. We generally set the acceptable minor defect level at 4.0.
How do I determine the right sample size and acceptance number?
As an example, for an inspection of a 7000-unit lot, with General Inspection Level of II, Table A indicates that the sample size code letter should be L. Table B indicates that the sample size should be 200 units.
Iso 2859 Sampling Standards
For an AQL of Major 2.5 / Minor 4.0, the corresponding acceptance number is Major 10/ Minor 14. This means critical defect should be 0 pc; major defects should be 10 pcs or less; minor defects should be 14 pcs or less. If selected samples have any critical level defects or have major defects of 11 or over, or minor defects of 15 or over, the whole batch will fail the inspection.
TABLE A
TABLE B
