This Technical Report deals with the determination of repeatability and reproducibility of test methods used for assessing the performance characteristics of household and similar electrical appliances. It also provides guidance for carrying out round robin tests (RRT).

It also specifies the uncertainty reporting of measurements of household and similar electrical appliances.

It describes methods to estimate the uncertainty of a measured result and to predict the range of measured values when the same appliance is measured in another laboratory applying the same measurement method.

It does not cover the development of measurement methods. It also does not deal with:

the production variability of the appliance;
how closely the measurement method reflects the normal use of appliances in households.

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

NOTE 3 For noise standardisation, some deviating definitions are used (see. IEC 60704-3:2019).

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PDF Pages	PDF Title
2	undefined
4	CONTENTS
6	FOREWORD
8	INTRODUCTION
9	1 Scope 2 Normative references 3 Terms and definitions
12	4 Determination of standard deviations 4.1 General 4.2 Repeatability standard deviation 4.3 Reproducibility standard deviation
13	5 Assessment of repeatability, reproducibility, and uncertainty of a measurement method 5.1 Purpose 5.2 Requirements
14	5.3 Expression of repeatability and reproducibility 5.4.1 The importance of the uncertainty 5.4.2 Methods to estimate uncertainty
15	5.4.3 Expanded uncertainty calculation
16	6 Scrutiny of results for consistency and outliers 6.1 Purpose 6.2 Graphical consistency technique (Mandel’s h and k statistics) 6.2.1 Inter-laboratory consistency statistic h 6.2.2 Intra-laboratory consistency statistic k 6.2.3 Evaluation
17	6.3 Numerical outlier technique 6.3.1 Cochran’s C test 6.3.2 Grubbs’ test 6.3.3 Evaluation
18	7 Data to be reported for assessing the repeatability, reproducibility and uncertainty of a test method Figures Figure 1 – Visualisation of straggler and outlier of Cochrane value
19	Annex A (informative) Example of bottom-up analysis A.1 General A.2 Temperature measurement system A.2.1 General A.2.2 Calibration of thermocouples A.2.3 Calibration of the DAQ system A.3 Uncertainty temperature measurement
20	Tables Table A.1 – Description of uncertainty parameters
21	A.4 Analysis of each component in the uncertainty formulation, example thermocouple simulator Table A.2 – Measuring a temperature of −23 °C at a climate room temperature between 16 °C to 32 °C Table A.3 – Expanded uncertainty in measured temperature (U(T), k = 2) at a room temperature in the range of 16 °C to 32 °C and a lab temperature between 14 °C and 32 °C
22	Table A.4 – Calibration results of the simulator
23	Annex B (informative) Guidance on how to conduct round robin tests for household and similar electrical appliances B.1 General B.2 Scope
24	B.3 Process and responsibilities B.3.1 Process
25	B.3.2 Responsibilities B.4 Testing laboratories B.4.1 Potential laboratories B.4.2 Announcement
26	B.4.3 Selection of laboratories B.4.4 Final list of laboratories B.5 Transportation of the product B.5.1 Logistics B.5.2 Packaging B.6 Test B.6.1 Performance of test
27	B.6.2 Laboratory visit B.6.3 Transmission of result B.7 Analysis, report and termination B.7.1 Analysis B.7.2 Report
28	B.7.3 Termination and publication of final external report
29	Annex C (informative) Example of a round robin test and its analysis C.1 General C.2 Standard deviations and assessment of repeatability and reproducibility Table C.1 – Measurement results
30	Table C.2 – Standard deviations, repeatability and reproducibility
31	C.3 Scrutiny of results for consistency and outliers C.3.1 Example of Mandel’s h and k statistics C.3.2 Example of numerical outlier test Table C.3 – Mandel’s h and k statistics Table C.4 – Cochran’s test C and Grubbs’ test G
32	Figure C.1 – Mandel’s h statistics Table C.5 – Cochran’s test C and Grubbs’ test G summary
33	Figure C.2 – Mandel’s k statistics
34	Annex D (informative)Example of expression of results
35	Bibliography

Published By	Publication Date	Number of Pages
BSI	2021	38


PDF Format	Searchable	Printable	Preview Now

Status	Definitive
Pages	38
Publication Date	2021-07-07
ISBN	978 0 539 05119 3
Standard Number	PD IEC TR 63250:2021
Title	Household and similar electrical appliances. Method of measuring performance. Assessment of repeatability, reproducibility and uncertainty
Identical National Standard Of	IEC/TR 63250 Ed.1.0
Descriptors	Electrical components, Electric connectors, Appliance plug sockets, Household equipment, Electrical household appliances, Cordless appliances
Publisher	BSI
Committee	CPL/59
ICS Codes	97.030 - Domestic electrical appliances in general

BSI PD IEC TR 63250:2021

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