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GB/T 32478-2016 English PDF (GBT32478-2016)

GB/T 32478-2016 English PDF (GBT32478-2016)

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GB/T 32478-2016: Household and similar electrical appliances method of measuring performance -- Assessment of repeatability and reproducibility

GB/T 32478-2016
GB
NATIONAL STANDARD OF
THE PEOPLE’S REPUBLIC OF CHINA
ICS 97.180; 97.060
Y 62
GB/T 32478-2016 / IEC 61923:1997
Household and similar electrical appliances
method of measuring performance –
Assessment of repeatability and reproducibility
[IEC 61923:1997(Ed 1.0) Household electrical appliances - Method of measuring performance - Assessment of repeatability and reproducibility, IDT]
ISSUED ON: FEBRUARY 24, 2016
IMPLEMENTED ON: SEPTEMBER 1, 2016
Issued by: General Administration of Quality Supervision, Inspection
and Quarantine;
Standardization Administration Committee.
3. No action is required - Full-copy of this standard will be automatically and immediately delivered to your EMAIL address in 0~60 minutes.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Definitions ... 5
4 Determination of standard deviations ... 8
5 Assessment of repeatability and reproducibility ... 9
6 Scrutiny of results for consistency and outliers ... 10
7 Data to be reported for assessing the repeatability and reproducibility of a test method ... 13
Annex A (Informative) Example ... 15
Annex B (Informative) Bibliography ... 19
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 Home Appliances Research and Development (Hangzhou) Co., Ltd., Bossi
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.
5.3 Expression of repeatability and reproducibility
Repeatability and reproducibility shall be expressed as a percentage of the permitted or accepted reference tolerances. The values of these tolerances have to be derived from the relevant mean value.
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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