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  • BSI
    21/30403747 DC BS ISO 3951-6. Sampling procedures for inspection by variables - Part 6. Specification for single sampling plans indexed by limiting quality (LQ) for isolated lot inspection for a single quality characteristic and a single LQ
    Edition: 2021
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Description of 21/30403747 DC 2021

This part of ISO 3951 is primarily designed for use under the following conditions:

  1. where the inspection procedure is to be applied to an isolated lot of discrete products all supplied by one producer using one production process;

  2. where only a single quality characteristic, x, of this process is taken into consideration, which must be measurable on a continuous scale;

  3. where the quality characteristic, x, is distributed according to a normal distribution or a close approximation to the normal distribution;

    NOTE 1

    The use of this part of ISO 3951 is applicable directly only when there is reason to believe that the distribution of measurements of the quality characteristic is normal (s. 11.1). If normal distribution is not warranted, data can be transformed (s. 11.2). In case of doubt, the responsible authority should be consulted.

  4. where the quality characteristic can be measured without or with moderate measurement bias;

  5. where a contract or standard defines a lower specification limit, L, an upper specification limit, U, or both; an item is qualified as conforming if and only if its measured quality characteristic, x, satisfies the appropriate one of the following inequalities:

    1. x ≥ L (i.e. the lower specification limit is not violated);

    2. x ≤ U (i.e. the upper specification limit is not violated);

    3. x ≥ L and x ≤ U (i.e. neither the lower nor the upper specification limit is violated).

Inequalities 1) and 2) are called cases with a single specification limit and 3) a case with double specification limits.

Where double specification limits apply, it is assumed in this part of ISO 3951 that conformance to both specification limits is equally important to the integrity of the product. In such cases, it is appropriate to apply a single LQ to the combined percentage of a product outside the two specification limits. This is referred to as combined control.



Standard Number21/30403747 DC
TitleBS ISO 3951-6. Sampling procedures for inspection by variables - Part 6. Specification for single sampling plans indexed by limiting quality (LQ) for isolated lot inspection for a single quality characteristic and a single LQ
StatusDefinitive
Publication Date2021-06-11
Identical National Standard OfISO/DIS 3951-6
DescriptorsMathematical calculations, Quality control, Statistical quality control, Inspection by variables, Power spectra, Sampling methods, Normal distribution, Standard deviation, Sampling tables, Inspection, Quality assurance, Control charts, Acceptance inspection, Sampling (data), Sampling plans, Data processing, Quality, Statistics
ICS03.120.30 Application of statistical methods
CommitteeSS/5
PublisherBSI
Pages60

About BSI

BSI Group, also known as the British Standards Institution is the national standards body of the United Kingdom. BSI produces technical standards on a wide range of products and services and also supplies certification and standards-related services to businesses.
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