EN IEC 60068-2-14:2023
(Main)Environmental testing - Part 2-14: Tests - Test N: Change of temperature
Environmental testing - Part 2-14: Tests - Test N: Change of temperature
IEC 60068-2-14:2023 is available as IEC 60068-2-14:2023 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.IEC 60068-2-14:2023 provides tests with specified ambient temperature changes to analyse their impacts on specimens. This seventh edition cancels and replaces the sixth edition published in 2009. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) updating of the figures for clarification purposes; b) updating of specimen temperature(s) and severities as well as tolerances for change of temperature tests; c) revision of standardized requirements for test reports for Tests Na and Nb.
Umgebungseinflüsse - Teil 2-14: Prüfverfahren - Prüfung N: Temperaturwechsel
Essais d'environnement - Partie 2-14: Essais - Essai N: Variation de température
IEC 60068-2-14:2023 est disponible sous forme de IEC 60068-2-14:2023 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.L'IEC 60068-2-14:2023 établit les essais de variations de la température ambiante spécifiée pour analyser leurs impacts sur les spécimens. Cette septième édition annule et remplace la sixième édition parue en 2009. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente: a) mise à jour des figures à des fins de clarification; b) mise à jour des températures et des sévérités des spécimens, ainsi que des tolérances sur les essais de variation de température; c) révision des exigences normalisées pour les rapports d'essai des Essais Na et Nb.
Okoljsko preskušanje - 2-14. del: Preskusi - Preskus N: Temperaturne spremembe (IEC 60068-2-14:2023)
Ta dokument določa preskuse z določenimi spremembami temperature okolja za analiziranje njihovega vpliva na preskušance.
General Information
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Standards Content (Sample)
SLOVENSKI STANDARD
01-maj-2024
Nadomešča:
SIST EN 60068-2-14:2009
Okoljsko preskušanje - 2-14. del: Preskusi - Preskus N: Temperaturne spremembe
(IEC 60068-2-14:2023)
Environmental testing - Part 2-14: Tests - Test N: Change of temperature (IEC 60068-2-
14:2023)
Umgebungseinflüsse - Teil 2-14: Prüfverfahren - Prüfung N: Temperaturwechsel (IEC
60068-2-14:2023)
Essais d'environnement - Partie 2-14: Essais - Essai N: Variation de température (IEC
60068-2-14:2023)
Ta slovenski standard je istoveten z: EN IEC 60068-2-14:2023
ICS:
19.040 Preskušanje v zvezi z Environmental testing
okoljem
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD EN IEC 60068-2-14
NORME EUROPÉENNE
EUROPÄISCHE NORM September 2023
ICS 19.040 Supersedes EN 60068-2-14:2009
English Version
Environmental testing - Part 2-14: Tests - Test N: Change of
temperature
(IEC 60068-2-14:2023)
Essais d'environnement - Partie 2-14: Essais - Essai N: Umgebungseinflüsse - Teil 2-14: Prüfverfahren - Prüfung N:
Variation de température Temperaturwechsel
(IEC 60068-2-14:2023) (IEC 60068-2-14:2023)
This European Standard was approved by CENELEC on 2023-08-31. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Türkiye and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2023 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 60068-2-14:2023 E
European foreword
The text of document 104/991/FDIS, future edition 7 of IEC 60068-2-14, prepared by IEC/TC 104
"Environmental conditions, classification and methods of test" was submitted to the IEC-CENELEC
parallel vote and approved by CENELEC as EN IEC 60068-2-14:2023.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2024-05-31
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2026-08-31
document have to be withdrawn
This document supersedes EN 60068-2-14:2009 and all of its amendments and corrigenda (if any).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
Any feedback and questions on this document should be directed to the users’ national committee. A
complete listing of these bodies can be found on the CENELEC website.
Endorsement notice
The text of the International Standard IEC 60068-2-14:2023 was approved by CENELEC as a
European Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standard indicated:
IEC 60068 series NOTE Approved as EN 60068 series
IEC 60068-2-6 NOTE Approved as EN 60068-2-6
IEC 60068-2-17 NOTE Approved as EN 60068-2-17
IEC 60068-2-30 NOTE Approved as EN 60068-2-30
IEC 60068-2-67 NOTE Approved as EN 60068-2-67
IEC 60068-3-1 NOTE Approved as EN 60068-3-1
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
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.
NOTE 1 Where an International Publication has been modified by common modifications, indicated by (mod),
the relevant EN/HD applies.
NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available
here: www.cencenelec.eu.
Publication Year Title EN/HD Year
IEC 60068-2-1 - Environmental testing - Part 2-1: Tests - Test A: EN 60068-2-1 -
Cold
IEC 60068-2-2 - Environmental testing - Part 2-2: Tests - Test B: EN 60068-2-2 -
Dry heat
IEC 60068-2-14 ®
Edition 7.0 2023-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Environmental testing –
Part 2-14: Tests – Test N: Change of temperature
Essais d'environnement –
Partie 2-14: Essais – Essai N: Variation de température
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 19.040 ISBN 978-2-8322-7265-7
– 2 – IEC 60068-2-14:2023 © IEC 2023
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
4 Symbols . 8
5 General . 8
5.1 Field conditions of changing temperature . 8
5.2 Design of tests with temperature change . 9
5.3 Test parameters . 9
5.4 Purpose and choice of the tests . 10
5.5 Choice of the exposure time to each conditioning temperature . 10
5.6 Choice of the duration of the transfer time t . 11
5.7 Applicability limits of change of temperature tests . 11
6 Initial and final measurements . 12
6.1 General . 12
6.2 Initial measurements . 12
6.3 Final measurements . 12
7 Test Na: Rapid change of temperature . 12
7.1 General description of the test . 12
7.2 Testing procedure . 12
7.2.1 Testing chamber . 12
7.2.2 Mounting or supporting of the test specimen . 15
7.2.3 Severities . 15
7.2.4 Preconditioning . 16
7.2.5 Test cycle . 17
7.3 Recovery . 19
8 Test Nb: Change of temperature with specified rate of change . 19
8.1 General description of the test . 19
8.2 Testing procedure . 20
8.2.1 Testing chamber . 20
8.2.2 Mounting or supporting structure of the test specimen . 20
8.2.3 Severities . 20
8.2.4 Tolerance . 21
8.2.5 Preconditioning . 22
8.3 Test cycle . 22
8.4 Recovery . 23
9 Test Nc: Rapid change of temperature, two-fluid-bath method . 24
9.1 General description of the test . 24
9.2 Testing procedure . 24
9.2.1 Testing equipment . 24
9.2.2 Severities . 24
9.2.3 Conditioning . 24
9.3 Test cycle . 25
9.4 Recovery . 25
10 Information to be given in the test report. 26
IEC 60068-2-14:2023 © IEC 2023 – 3 –
Annex A (informative) Potential consequences of improper severities . 27
Annex B (informative) Thermal responsiveness of different materials and geometries . 28
Annex C (normative) Auxiliary table with exemplary temperature tolerances ±σ for
T
preferred combinations of high and low conditioning temperatures and rates of
temperature change (Test Nb) . 29
Bibliography . 35
Figure 1 – Determination of the exposure time t of the specimen to each conditioning
temperature . 11
Figure 2 – Schematic representation of examples of thermal test cabinets and test
procedure with two separate test chambers . 13
Figure 3 – Schematic representation of examples of thermal test cabinets with one test
chamber . 14
Figure 4 – Possibility of condensation during rapid temperature change . 15
Figure 5 – Possibility of condensation during transfer of the specimen . 15
Figure 6 – Increased severity of Test Na . 16
Figure 7 – Na test cycle, one-chamber method . 17
Figure 8 – Na test cycle, two-chamber method . 19
Figure 9 – Tolerance for fluctuation of test temperatures . 22
Figure 10 – Nb test cycle . 23
Figure 11 – Test times for intermediate operation of specimens . 23
Figure 12 – Nc test cycle . 25
Figure A.1 – Delayed tempe
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