GB/T 32478-2016Household and similar electrical appliances method of measuring performance -- Assessment of repeatability and reproducibility (English PDF)

Foreword

This Standard was drafted in accordance with the rules given in GB/T

1.1-2009.

This Standard identically adopts IEC TR 61923:1997 Household electrical

appliances - Method of measuring performance - Assessment of repeatability

and reproducibility.

This Standard was proposed by China Light Industry Federation.

This Standard shall be under the jurisdiction of National Technical Committee

on Home Appliances of Standardization Administration of China (SAC/TC

46).

The drafting organizations of this Standard: China Household Electrical

Appliances Research Institute, Zhejiang Shaoxing Supor Life Electric

Appliance Co., Ltd., Guangdong Galanz Group Co., Ltd., Wuxi Little Swan

Company Limited, Guangdong Tonze Electric Appliance Co., Ltd., Panasonic

Household Appliances Investment (China) Co., Ltd., National Household

Electrical Appliances Quality Supervision and Inspection Center.

Main drafters of this Standard: Ma Dejun, Zhu Yan, Lu Jianguo, Cai Caide,

Zhang Xiao, Jia Chungeng, Gao Yang, Lv Quanbin, Sun Peng, Li Xufei, Yuan

Haiyan.

Household and similar electrical appliances

method of measuring performance –

Assessment of repeatability and reproducibility

1 Scope

This Technical Report deals with the determination of repeatability and

reproducibility of test methods used for assessing the characteristics of

household electrical appliances.

It does not cover the development of measurement methods but deals with

gathering and evaluating the information needed by a manufacturer so that

values can be stated after an appliance has been subjected to an agreed test.

It also does not deal with:

- the production variability of the appliance;

- how closely the measurement method reflects the normal use of the

appliance.

NOTE 1: Although this technical report does not cover the development of test methods, it

may be taken into consideration for this purpose.

NOTE 2: For the purpose of this technical report production variability includes the variation

of the individual appliances of the same type and model manufactured on the same

production line.

2 Normative references

The following referenced documents are indispensable for the application of

this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including

any amendments) applies.

GB/T 6379.2-2004, Accuracy (trueness and precision) of measurement

methods and results - Part 2: Basic method for the determination of

repeatability and reproducibility of a standard measurement method

ISO 3534-1:1993, Statistics - Vocabulary and symbols - Part 1: Probability

and general statistic terms

NOTE 1: Data obtained in inter-laboratory studies may indicate that further effort is

needed to improve the measurement method.

b) standard deviations shall be significantly lower than the basic

assessment ranges. They should be less than 50 % of the permitted or

accepted reference tolerances but shall be less than these reference

tolerances;

c) the necessary number of tests and laboratories participating in an

inter-laboratory test depends on the type of appliance and shall be

established by the responsible body. With respect to a statistical

evaluation of the test results, at least five test results from each of at

least five laboratories, excluding any outlier, should be available;

NOTE 2: The number of test results should be the same for each laboratory.

d) the test procedures have to be specified completely and accurately,

including the rounding of values from measurement results, the

accuracy of the measuring instruments and the environmental

conditions, as appropriate;

e) wherever possible, precise values of intermediate results (without

rounding) should be recorded and used in subsequent calculations to

ensure that the final result is as accurate as possible;

f) the test laboratories shall adhere to the test procedure specified in the

standard or in the test program;

g) only appliances with low variability shall be used;

h) the reference appliance, if any, shall have the lowest variability.

6 Scrutiny of results for consistency and outliers

Outliers related to test results as well as to test laboratories are scarce but

cannot always be avoided. They shall be taken into consideration but they

should not lead to a distortion of the results of a test which has been carried

out to assess the repeatability and reproducibility of a test method.

A statistical procedure by which suspect test results or laboratories are

judged is not specified. The final decision about the treatment of outliers (e.g.

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