BS 6001-2:1993

Committees responsible
National foreword
Specification
0 Introduction
1 Scope and field of application
2 Definitions
3 Choice of sampling plan
4 Rules for acceptance and non-acceptance
5 Double and multiple sampling plans
6 Examples illustrating how to use this part of ISO
     2859
7 Compatibility with ISO 2859/1
Tables
A Single sample plans indexed by limiting quality
     (LQ) (Procedure A)
B1 Sampling plans for limiting quality 0,5 %
B2 Single sampling plans for limiting quality 0,8 %
B3 Single sampling plans for limiting quality 1,25 %
B4 Single sampling plans for limiting quality 2,00 %
B5 Single sampling plans for limiting quality 3.15 %
B6 Single sampling plans for limiting quality 5,0 %
B7 Single sampling plans for limiting quality 8,0 %
B8 Single sampling plans for limiting quality 12,5 %
B9 Single sampling plans for limiting quality 20,0 %
B10 Single sampling plans for limiting quality 32,0 %
C Relation between limiting quality (LQ) and
     consumer's risk quality (CRQ)
D1 Summary of sampling plan properties for procedure A
D2 Selected hypergeometric data for OC curves for zero
     acceptance plans
D3 Equivalent sample sizes for single, double and
     multiple sampling plans
D4 Equivalent acceptance numbers for single, double
     and multiple sampling plans
D5 Correspondence between lot sizes, AQL values in ISO
     2859/1 and LQ values (Inspection levels I and II,
     procedure B)
D6 Correspondence between lot sizes and sample size
     code letters (Inspection levels S-1 to S-4 and I to
     III, procedure B)

Plans that can be used when the switching rules of BS 6001-1 are not applied, e.g. for \'isolated lots\'. Preferred series of limiting qualities (LQ) with consumer\'s risk usually below 10%. Rationalizes the \'ad hoc\' procedure mentioned in 11.6 of BS 6001-1.

This part of ISO2859 establishes LQ sampling plans and procedures for inspection by attributes compatible with ISO2859‑1 that can be used when the switching rules given in ISO2859‑1 are not applied, for example, when lots are of an isolated nature.

The plans in this part of ISO2859 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 ISO2859‑1 to be implemented as a standard procedure.

NOTE The plans in ISO2859‑1 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).