IEC 60068-2-39
Edition 2.0 2015-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Environmental testing –
Part 2-39: Tests – Tests and guidance: Combined temperature or temperature
and humidity with low air pressure tests
Essais d'environnement –
Partie 2-39: Essais – Essais et lignes directrices: Essais combinés de
température ou de température et d’humidité à basse pression atmosphérique
IEC 60068-2-39:2015-09(en-fr)
®
IEC 60068-2-39
Edition 2.0 2015-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Environmental testing –
Part 2-39: Tests – Tests and guidance: Combined temperature or temperature
and humidity with low air pressure tests
Essais d'environnement –
Partie 2-39: Essais – Essais et lignes directrices: Essais combinés de
température ou de température et d’humidité à basse pression atmosphérique
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 19.040
ISBN 978-2-8322-2897-5
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
®
Warning! Make sure that you obtained this publication from an authorized distributor.
Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.
– 2 – IEC 60068-2-39:2015 © IEC 2015
CONTENTS
FOREWORD ........................................................................................................................... 3
INTRODUCTION ..................................................................................................................... 5
1 Scope and object ............................................................................................................. 6
2 Normative references ...................................................................................................... 6
3 Terms and definitions ...................................................................................................... 6
4 Testing ............................................................................................................................ 6
4.1 General ................................................................................................................... 6
4.2 Preferred combinations ........................................................................................... 6
4.3 Initial measurement and functional performance test ............................................... 7
4.4 Test procedure ........................................................................................................ 7
4.4.1 Preconditioning .............................................................................................. 7
4.4.2 Test with temperature and low air pressure .................................................... 7
4.4.3 Test with temperature, humidity and low air pressure ..................................... 9
5 Final measurements ...................................................................................................... 12
6 Information to be given in the relevant specification ....................................................... 12
7 Information to be given in the test report........................................................................ 12
Annex A (informative) Guidance on combined temperature or temperature and
humidity with low air pressure testing .................................................................................... 14
A.1 General ................................................................................................................. 14
A.2 Environmental effects ........................................................................................... 14
A.3 Measurement of temperature ................................................................................ 14
Bibliography .......................................................................................................................... 16
Figure 1 – Example of test sequence with cold temperature and low air pressure ................... 8
Figure 2 – Example of test sequence with dry heat and low air pressure ................................. 9
Figure 3 – Example of test sequence of temperature and humidity with low air
pressure ............................................................................................................................... 11
Table 1 – Test severities ......................................................................................................... 7
IEC 60068-2-39:2015 © IEC 2015 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ENVIRONMENTAL TESTING –
Part 2-39: Tests –
Tests and guidance: Combined temperature or
temperature and humidity with low air pressure 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
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2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
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3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
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5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
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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
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other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
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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 60068-2-39 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 1976 and constitutes a
technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) preferred severities of the IEC 60068 series;
b) combined temperature, humidity and low air pressure
– 4 – IEC 60068-2-39:2015 © IEC 2015
The text of this standard is based on the following documents:
FDIS Report on voting
104/657/FDIS 104/661/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, published 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 publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
