ISO 3951-5:2006

Current Revision
Sampling procedures for inspection by variables - Part 5: Sequential sampling plans indexed by acceptance quality limit (AQL) for inspection by variables (known standard deviation)

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ISO 3951-5:2006

Sampling procedures for inspection by variables - Part 5: Sequential sampling plans indexed by acceptance quality limit (AQL) for inspection by variables (known standard deviation)

PUBLISH DATE 2006
ISO 3951-5:2006

ISO 3951-5:2006 specifies a system of sequential sampling plans (schemes) for lot-by-lot inspection by variables. The schemes are indexed in terms of a preferred series of acceptance quality limit (AQL) values, ranging from 0.01 to 10, which are defined in terms of percent nonconforming items. The schemes are designed to be applied to a continuing series of lots.

ISO 3951-5:2006 is designed for use under the following conditions:

  • where the inspection procedure is to be applied to a continuing series of lots of discrete products all supplied by one producer using one production process;
  • where only a single quality characteristic of these products is taken into consideration, which must be measurable on a continuous scale;
  • where the uncertainty of the measurement system is negligible with respect to the production process standard deviation;
  • where production is stable (under statistical control) and the quality characteristic is distributed according to a normal distribution (or a close approximation to the normal distribution) or a distribution which may be mathematically transformed to a normal distribution;
  • where the standard deviation of the quality characteristic is known; and
  • where a contract or standard defines an upper specification limit, a lower specification limit or both.
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