SIST EN 60068-3-1:2012

SLOVENSKI STANDARD
01-januar-2012
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Environmental testing - Part 3-1: Supporting documentation and guidance - Cold and dry
heat tests
Umgebungseinflüsse - Teil 3-1: Unterstützende Dokumentation und Leitfaden -
Prüfverfahren Kälte und trockene Wärme
Essais d'environnement - Partie 3-1: Documentation d'accompagnement et guide -
Essais de froid et de chaleur sèche
Ta slovenski standard je istoveten z: EN 60068-3-1:2011
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 60068-3-1
NORME EUROPÉENNE
November 2011
EUROPÄISCHE NORM
ICS 19.040 Supersedes EN 60068-3-1:1999

English version
Environmental testing -
Part 3-1: Supporting documentation and guidance -
Cold and dry heat tests
(IEC 60068-3-1:2011)
Essais d'environnement -  Umgebungseinflüsse -
Partie 3-1: Documentation Teil 3-1: Unterstützende Dokumentation
d'accompagnement et guide - und Leitfaden -
Essais de froid et de chaleur sèche Prüfverfahren Kälte und trockene Wärme
(CEI 60068-3-1:2011) (IEC 60068-3-1:2011)

This European Standard was approved by CENELEC on 2011-09-23. 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, Romania, Slovakia, Slovenia,
Spain, Sweden, Switzerland and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Management Centre: Avenue Marnix 17, B - 1000 Brussels

© 2011 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 60068-3-1:2011 E
Foreword
The text of document 104/555/FDIS, future edition 2 of IEC 60068-3-1, 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 60068-3-1:2011.

The following dates are fixed:
(dop) 2012-06-23
• latest date by which the document has
to be implemented at national level by
publication of an identical national
standard or by endorsement
(dow) 2014-09-23
• latest date by which the national
standards conflicting with the
document have to be withdrawn
This document supersedes EN 60068-3-1:1999.
The main changes with regard to EN 60068-3-1:1999 are as follows:

– removal of guidance regarding thermal characteristics of chamber walls;
– revision of sections that address environmental chambers that do not use movement of air for
temperature control.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such patent
rights.
Endorsement notice
The text of the International Standard IEC 60068-3-1:2011 was approved by CENELEC as a European
Standard without any modification.

- 3 - EN 60068-3-1:2011
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

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.

NOTE  When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.
Publication Year Title EN/HD Year

IEC 60068-1 - Environmental testing - EN 60068-1 -
Part 1: General and guidance
IEC 60068-2-1 - Environmental testing - EN 60068-2-1 -
Part 2-1: Tests - Test A: Cold

IEC 60068-2-2 - Environmental testing - EN 60068-2-2 -
Part 2-2: Tests - Test B: Dry heat

IEC 60068-3-1 ®
Edition 2.0 2011-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Environmental testing –
Part 3-1: Supporting documentation and guidance – Cold and dry heat tests

Essais d’environnement –
Partie 3-1: Documentation d’accompagnement et guide – Essais de froid et de
chaleur sèche
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX M
ICS 19.040 ISBN 978-2-88912-626-2

– 2 – 60068-3-1 © IEC:2011
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Selection of test procedures . 5
4.1 General background . 5
4.1.1 General . 5
4.1.2 Ambient temperature . 6
4.1.3 Specimen temperatures . 6
4.1.4 Specimens without heat dissipation . 6
4.1.5 Specimens with heat dissipation . 6
4.2 Mechanisms of heat transfer . 6
4.2.1 Convection . 6
4.2.2 Radiation . 9
4.2.3 Thermal conduction . 10
4.2.4 Forced air circulation . 10
4.3 Test chambers . 10
4.3.1 General . 10
4.3.2 Methods of achieving the required conditions in the test chamber. 11
4.4 Measurements . 11
4.4.1 Temperature . 11
4.4.2 Air velocity . 11
Annex A (informative) Effect of airflow on chamber conditions and on surface
temperatures of test specimens . 12

Figure 1 – Experimental data on the effect of airflow on surface temperature of a wire-
wound resistor – Radial airflow . 7
Figure 2 – Experimental data on the effect of airflow on surface temperature of a wire-
wound resistor – Axial airflow . 8
Figure 3 – Temperature distribution on a cylinder with homogeneous heat generation in
–1
.................................................................................... 9
airflow of velocities 0,5, 1 and 2 m⋅s

Table 1 – Influence parameters when testing heat-dissipating specimens . 11

60068-3-1 © IEC:2011 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ENVIRONMENTAL TESTING –
Part 3-1: Supporting documentation and guidance –
Cold and dry heat tests
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
in the subject dealt with may participate in this preparatory work. International, governmental and non-
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
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60068-3-1 has been prepared by IEC technical committee 104:
Environmental conditions, classification and methods of test.
This second edition cancels and replaces the first edition, published in 1974, and constitutes
a technical revision.
The main changes with regard to the previous edition are as follows:
– removal of guidance regarding thermal characteristics of chamber walls;
– revision of sections that address environmental chambers that do not use movement of air
for temperature control.
– 4 – 60068-3-1 © IEC:2011
The text of this standard is based on the following documents:
FDIS Report on voting
104/555/FDIS 104/558/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts in the IEC 60068 series, under the general title Environmental testing can be
found on the IEC website.
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data
related to the specific
...