GB/T 2829-2002 English PDF (GB/T2829-2002)

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GB/T 2829-2002: Sampling procedures and tables for periodic inspection by attributes (apply to inspection of process stability)
GB/T 2829-2002
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 03.120.30
A 41
Replacing GB/T 2829-1987
Sampling procedures and tables for periodic
inspection by attributes (Apply to inspection of
process stability)
ISSUED ON: JUNE 13, 2002
IMPLEMENTED ON: JANUARY 01, 2003
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Terms, definitions and symbols ... 4 
4 Inspection procedures ... 9 
5 Implementation of inspection ... 10 
6 Sampling characteristic curve and average sample number curve ... 20 
Sampling procedures and tables for periodic
inspection by attributes (Apply to inspection of
process stability)
1 Scope
This Standard specifies the primary, secondary, and fifth sampling plans and
sampling procedures based on the rejection quality level (expressed as the
percentage of rejected products or the number of rejected products per hundred
units) as the quality indicator. It is applicable to the inspection for process
stability.
2 Normative references
The provisions in following documents become the provisions of this Standard
through reference in this Standard. For dated references, the subsequent
amendments (excluding corrigendum) or revisions do not apply to this Standard,
however, parties who reach an agreement based on this Standard are
encouraged to study if the latest versions of these documents are applicable.
For undated references, the latest edition of the referenced document applies.
GB/T 3358.1-1993, Terms for statistics. Part I: Terms for general statistics
GB/T 3358.2-1993, Terms for statistics Part II: Terms for statistical quality
control
GB/T 28281), Sampling procedures for inspection by attributes (idt ISO 2859-
1)
3 Terms, definitions and symbols
3.1 Terms and definitions
For the purposes of this document, the terms and definitions defined in GB/T
3358 as well as the followings apply.
1) In the process of revision (it is the revision of GB/T 2828-1987 "Sampling procedures and tables for
lot-by-lot inspection by attributes (Apply to inspection of successive lots or batches)"). It is equivalent
to ISO 28591: 1999.
the important quality characteristics of the unit product do not meet the
regulations, or the quality characteristics of the unit product seriously do not
meet the regulations
3.1.10 Class C rejection
the general quality characteristics of the unit product do not meet the
regulations, or the quality characteristics of the unit product slightly do not meet
the regulations
3.1.11 rejected product
there are one or more rejected unit products; according to the type of rejection,
it can be generally divided into: Class A rejected product, Class B rejected
product, Class C rejected product
3.1.12 Class A rejected product
there is one or more Class A rejection, and there may also be Class B and/or C
rejection unit products
3.1.13 Class B rejected product
there is one or more Class B rejection, and there may also be Class C rejection,
but excluding Class A rejection unit products
3.1.14 Class C rejected product
there is one or more Class C rejection, but excluding Class A and B rejection
unit products
3.1.15 percentage of rejected products
the total number of all rejected products in the batch divided by the batch
number, then multiplied by 100; that is:
Percentage of rejected products = (total number of rejected products in the
batch / batch number) × 100
3.1.16 number of rejected products per hundred units
the total number of rejected products of all units in the batch divided by the
batch number, and then multiplied by 100; that is:
Number of rejected products per hundred units = (total number of rejected
products in all unit products in the batch / batch number) × 100
3.1.17 batch quality
in count acceptance sampling, the minimum number of rejection or rejected
products that are not allowed in samples of a rejected batch
3.1.27 determination array
a combination of determined number of acceptance and determined number of
rejection or determined number series of acceptance and determined number
series of rejection
3.1.28 sampling plan
a specific plan for sample number and relevant acceptance criteria
3.1.29 sampling procedure
a process of using the sampling plan to determine whether the lot is qualified
or not
3.1.30 primary sampling plan
a sampling plan composed of sample number and determination array [Ac, Re]
3.1.31 secondary sampling plan
a sampling plan composed of the first sample number n1, the second sample
number nz, and the determination array [A1, A2, R1, R2]
3.1.32 fifth sampling plan
a sampling plan composed of sample number series n1, n2, n3, n4, n5 and
determination array [A1, A2, A3, A4, A5, R1, R2, R3, R4, R5]
3.1.33 discrimination level
the level of ability to judge the stability of the production process that does not
meet the specified requirements
3.1.34 probability of acceptance
when a definite sampling plan is used, the probability that a batch or process
with a given quality level will be judged as acceptance
3.1.35 average sample number
when a certain sampling plan is used to make a decision of acceptance or
rejection, the average number of samples to be inspected per batch expected
3.1.36 sampling characteristic curve (OC curve)
b) Select test items and form test groups;
c) Specify test methods and quality characteristics;
d) Specify rejection classification;
e) Specify rejection quality level;
f) Specify discrimination level;
g) Select sampling plan type;
h) Search sampling plan;
i) Extract sample;
j) Inspect sample;
k) Determine whether periodic inspection is accepted or rejected;
l) Disposal after periodic inspection.
5 Implementation of inspection
5.1 Provisions on inspection cycle
In the product technical standard or order contract, the inspection period shall
be appropriately specified according to the approximate duration of the product
production process, the test time and the test cost. Usually the inspection period
is one month, two months, three months, half a year, or even one or two years.
In the same product technical standard or order contract, different inspection
cycles are allowed for different test groups.
In addition, it is allowed to specify the inspection cycle according to the quantity
manufactured by product.
5.2 Selection of test items and composition of test groups
In the product technical standard or order contract, the test items shall be
selected according to the actual needs of the product and the possibility of
implementation. Combine these test items into as few test groups as possible.
5.3 Provisions on test methods and quality characteristics
In the product technical standard or order contract, the corresponding test
method shall be specified for each test item. Specify the technical performance,
technical indicators, appearance and other quality characteristics for each
5.7 Selection of sampling plan type
This Standard, in Table 2~Table 4, Table 5~Table 7 and Table 8~Table 10,
respectively gives three types of sampling plans: primary, secondary and fifth
sampling plans. For a given set of rejection quality levels and discrimination
levels, different types of corresponding sampling plans can be used. Usually,
by comparing the management...