ISO 2859-2 Sampling Procedures for Inspection by Attributes - Part 2: Sampling Plans Indexed by Limiting Quality (LQ) for Isolated Lot Inspection
 |
| Purchase Information |
| Use this form to request purchase information on ISO online subscriptions. |
|
|
Document ISO 2859-2 is offered by IHS as part of an online subscription. This subscription contains many documents on the same topic.
You may also purchase this document alone from the IHS Standards Store.
ISO 2859-2 Document Information:
Title
Sampling Procedures for Inspection by Attributes - Part 2: Sampling Plans Indexed by Limiting Quality (LQ) for Isolated Lot Inspection
International Organization for Standardization
Publication Date:
Jan 1, 1985
Scope:
This part of ISO 2859 establishes LQ sampling plans and procedures for inspection by attributes compatible with ISO 2859/1 that can be used when the switching rules given in ISO 2859/1 are not applied, for example, when lots are of an isolated nature.
The plans in this part of ISO 2859 are indexed by a preferred series of limiting qualities (LQ) with a consumer’s risk usually below 10 %, but always below 13 %. This method of indexing permits the “ad-hoc” procedure1) mentioned in sub-clause 12.6 of ISO 2859/1 to be implemented as a standard procedure.
NOTE - The plans in ISO 2859/1 are indexed by a preferred series of AQL values and inspection levels. During the inspection of a continuing series of lots the application of switching rules helps to ensure that the process average in that series of lots is kept below the specified AQL. Limiting quality does not have the same direct relationship with the process average (see 3.5.1).
1) ISO 2859/1 sub-clause 12.6.2, states: “If the lot or batch is of an isolated nature, it may be desirable to limit the selection of sampling plans to those, associated with a designated AQL value, that provide not less than a specified limiting quality protection. Sampling plans for this purpose can be selected by choosing a limiting quality (LQ) and a consumer’s risk to be associated with it. Tables 6 and 7 give process levels for which the probabilities of lot acceptance under various sampling plans are 10 % and 5 %, respectively.” This part of ISO 2859 establishes preferred values for the LQ and allows the consumer’s risk to vary as indicated above.
About IHS
IHS (NYSE: IHS) is a leading global provider of critical technical information, decision-support tools and related services in a number of industries including aerospace and defense, automotive, construction, electronics, and energy. IHS serves customers ranging from large governments and multinational corporations to smaller companies and technical professionals in more than 100 countries. IHS been in business for more than 45 years and employ more than 2,300 people around the world.
