Guidance on how to conduct round robin tests for household and similar electrical appliances

IEC TR 62970:2016(E) provides guidance for carrying out round robin tests (RRT) and hence for the determination of levels of repeatability (intra-laboratory variability) and reproducibility (inter-laboratory variability) for household and similar electrical appliances. This document can also be used to verify the measurement methods, to improve the measurement method, and to qualify laboratories. It is not applicable for the determination of production variation for a particular product. General advice on proficiency testing of laboratories is given in ISO/IEC 17043. This document can be used in addition to ISO/IEC 17043.

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Publication Date
29-Nov-2022
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IEC TR 62970
Edition 1.0 2016-06
TECHNICAL
REPORT
Guidance on how to conduct round robin tests for household and similar
electrical appliances
IEC TR 62970:2016-06(en)
---------------------- Page: 1 ----------------------
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IEC TR 62970
Edition 1.0 2016-06
TECHNICAL
REPORT
Guidance on how to conduct round robin tests for household and similar
electrical appliances
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 97.030 ISBN 978-2-8322-3488-4

Warning! Make sure that you obtained this publication from an authorized distributor.

® Registered trademark of the International Electrotechnical Commission
---------------------- Page: 3 ----------------------
– 2 – IEC TR 62970:2016 © IEC 2016
CONTENTS

FOREWORD ......................................................................................................................... 3

INTRODUCTION ................................................................................................................... 5

1 Scope ............................................................................................................................ 6

2 Normative references..................................................................................................... 6

3 Terms and definitions .................................................................................................... 6

4 Process and responsibilities ........................................................................................... 7

4.1 Process ................................................................................................................ 7

4.1.1 Product to be tested ....................................................................................... 7

4.1.2 Parameters to be tested ................................................................................. 7

4.1.3 Measurement procedure ................................................................................. 8

4.1.4 RRT procedure .............................................................................................. 8

4.2 Responsibilities ..................................................................................................... 9

4.2.1 Contracting body ............................................................................................ 9

4.2.2 Coordinator .................................................................................................... 9

4.2.3 Subcontractor ................................................................................................ 9

4.2.4 Financing of RRT ........................................................................................... 9

5 Testing laboratories ....................................................................................................... 9

5.1 Potential laboratories ............................................................................................ 9

5.2 Announcement ...................................................................................................... 9

5.2.1 General ......................................................................................................... 9

5.2.2 Questionnaire ................................................................................................ 9

5.2.3 Assessment of selection of laboratories ........................................................ 10

5.3 Selection of laboratories ...................................................................................... 10

5.4 Final list of laboratories ....................................................................................... 10

6 Transportation of the product ....................................................................................... 10

6.1 Logistics ............................................................................................................. 10

6.2 Packaging ........................................................................................................... 10

7 Test ............................................................................................................................ 10

7.1 Execution of test ................................................................................................. 10

7.2 Laboratory visit ................................................................................................... 11

7.3 Transmission of result ......................................................................................... 11

8 Analysis, report and termination ................................................................................... 11

8.1 Analysis .............................................................................................................. 11

8.2 Report ................................................................................................................ 11

8.2.1 Draft report .................................................................................................. 11

8.2.2 Content of the internal report ........................................................................ 11

8.3 Termination and publication of final external report .............................................. 11

Bibliography ....................................................................................................................... 13

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IEC TR 62970:2016 © IEC 2016 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
GUIDANCE ON HOW TO CONDUCT ROUND ROBIN TESTS
FOR HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES
FOREWORD

1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

all national electrotechnical committees (IEC National Committees). The object of IEC is to promote

international co-operation on all questions concerning standardization in the electrical and electronic fields. To

this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,

Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC

Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested

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governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely

with the International Organization for Standardization (ISO) in accordance with conditions determined by

agreement between the two organizations.

2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international

consensus of opinion on the relevant subjects since each technical committee has representation from all

interested IEC National Committees.

3) IEC Publications have the form of recommendations for international use and are accepted by IEC National

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between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in

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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is

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9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of

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The main task of IEC technical committees is to prepare International Standards. However, a

technical committee may propose the publication of a Technical Report when it has collected

data of a different kind from that which is normally published as an International Standard, for

example "state of the art".

IEC TR 62970, which is a Technical Report, has been prepared by IEC technical committee

59: Performance of household and similar electrical appliances.
This Technical Report is based on EN TR 50619:2014.
The text of this Technical Report is based on the following documents:
Enquiry draft Report on voting
59/627/DTR 59/652/RVC

Full information on the voting for the approval of this Technical Report can be found in the

report on voting indicated in the above table.
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– 4 – IEC TR 62970:2016 © IEC 2016

This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

The committee has decided that the contents of this publication will remain unchanged until

the stability date indicated on the IEC website under "http://webstore.iec.ch" in the data

related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
A bilingual version of this publication may be issued at a later date.
---------------------- Page: 6 ----------------------
IEC TR 62970:2016 © IEC 2016 – 5 –
INTRODUCTION

It is the responsibility of each standardization committee testing household and similar

electrical appliances to establish the repeatability and reproducibility of the measurement

standards developed.
Results from inter-laboratory comparisons are important for
a) identification of interlaboratory differences;

b) establishment of the effectiveness and comparability of test or measurement methods;

c) validation of uncertainties;

d) evaluation of the performance of laboratories for specific tests or measurements and

monitoring laboratories' continuing performance;

e) identification of problems in laboratories and initiation of actions for improvement which,

for example, may be related to inadequate test or measurement procedures, effectiveness

of staff training and supervision, or calibration of equipment; and

f) education of participating laboratories based on the outcomes of such comparisons.

The need for ongoing confidence in laboratory performance is not only essential for

laboratories and their contractors but also for other interested parties, such as regulators,

laboratory accreditation bodies and other organizations that specify requirements for

laboratories. ISO/IEC 17011 requires accreditation bodies to take account of laboratories'

participation and performance in proficiency testing.

In this respect, round robin testing was widely made in the past by IEC TC 59 for the

development of measurement procedures for the purpose of EU regulatory measures on

Labelling and Ecodesign. Round robin test results have been widely taken into account in the

establishment of regulations, in defining tolerance levels for verification of declared values

and/or limits.

This document is intended to provide a consistent basis for performing round robin testing. It

gives guidance to all interested parties to determine the competence among each other. It

provides common ground for reliable statistical data (repeatability and reproducibility levels,

etc.) as needed for regulation purposes (like for Labelling and Ecodesign).
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– 6 – IEC TR 62970:2016 © IEC 2016
GUIDANCE ON HOW TO CONDUCT ROUND ROBIN TESTS
FOR HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES
1 Scope

This document provides guidance for carrying out round robin tests (RRT) and hence for the

determination of levels of repeatability (intra-laboratory variability) and reproducibility (inter-

laboratory variability) for household and similar electrical appliances.
This document can also be used to verify the measurement methods, to improve the
measurement method, and to qualify laboratories.

It is not applicable for the determination of production variation for a particular product.

General advice on proficiency testing of laboratories is given in ISO/IEC 17043. This

document can be used in addition to ISO/IEC 17043.

NOTE The repeatability and reproducibility levels are important factors for the establishment of uncertainty

margins of the measurement methods and for the definition of tolerance levels in verification schemes.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their

content constitutes requirements 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.

ISO/IEC 17043:2010, Conformity assessment – General requirements for proficiency testing

IEC TR 61923, Household electrical appliances – Method of measuring performance –

Assessment of repeatability and reproducibility
3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO/IEC 17043:2010

and the following apply.

ISO and IEC maintain terminological databases for use in standardization at the following

addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at
...

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