IEC 60068-2-78:2012
(Main)Environmental testing - Part 2-78: Tests - Test Cab: Damp heat, steady state
Environmental testing - Part 2-78: Tests - Test Cab: Damp heat, steady state
IEC 60068-2-78:2012 establishes a test method for determining the ability of components or equipment to withstand transportation, storage and use under conditions of high humidity. The object of this standard is to investigate the effect of high humidity at constant temperature without condensation on a specimen over a prescribed period. It is applicable to small equipment or components as well as large equipment, and can be applied to both heat-dissipating and non-heat-dissipating specimens. This second edition cancels and replaced the first edition, published in 2001 and constitutes a technical revision. This edition includes editorial and format changes with respect to the previous edition:
- The test chamber from IEC 60068-3-6 has been introduced.
Essais d'environnement - Partie 2-78: Essais - Essai Cab: Chaleur humide, essai continu
IEC 60068-2-78:2012 établit une méthode d'essai en vue de déterminer la capacité des composants ou des matériels à supporter le transport, le stockage et l'utilisation dans des conditions de forte humidité. L'objet de cette norme est de rechercher l'effet d'une forte humidité à température constante sans condensation sur un spécimen, au cours d'une période prescrite. Elle est applicable aussi bien à des petits matériels ou composants qu'à des matériels volumineux, et peut être appliquée à la fois à des spécimens dissipateurs de chaleur et non dissipateurs de chaleur. Cette deuxième édition annule et remplace la première édition, publiée en 2001, et constitue une révision technique. Cette édition inclut des modifications éditoriales et de mise en page par rapport à l'édition précédente:
- L'essai en chambre de la CEI 60068-3-6 est ajouté.
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IEC 60068-2-78 ®
Edition 2.0 2012-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
BASIC SAFETY PUBLICATION
PUBLICATION FONDAMENTALE DE SÉCURITÉ
Environmental testing –
Part 2-78: Tests – Test Cab: Damp heat, steady state
Essais d’environnement –
Partie 2-78: Essais – Essai Cab: Chaleur humide, essai continu
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IEC 60068-2-78 ®
Edition 2.0 2012-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
BASIC SAFETY PUBLICATION
PUBLICATION FONDAMENTALE DE SÉCURITÉ
Environmental testing –
Part 2-78: Tests – Test Cab: Damp heat, steady state
Essais d’environnement –
Partie 2-78: Essais – Essai Cab: Chaleur humide, essai continu
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX J
ICS 19.040; 29.020 ISBN 978-2-83220-444-3
– 2 – 60068-2-78 IEC:2012
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope and object . 6
2 Normative references . 6
3 Terms and definitions . 6
4 General test procedure . 6
4.1 Test chamber and measuring system . 6
4.2 Severity . 7
4.3 Pre-conditioning . 7
4.4 Testing procedure . 7
4.5 Recovery procedure . 8
5 Measurements . 8
5.1 Initial measurements . 8
5.2 Intermediate measurements . 8
5.3 Final measurements . 8
6 Information to be given in the relevant specification. 8
7 Information to be given in the test report . 9
Table 1 – Temperature and relative humidity . 7
60068-2-78 IEC:2012 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ENVIRONMENTAL TESTING –
Part 2-78: Tests – Test Cab: Damp heat, steady state
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 60068-2-78 has been prepared by technical committee 104:
Environmental conditions, classification, and methods of test.
This second edition cancels and replaced the first edition, published in 2001 and constitutes a
technical revision.
This edition includes editorial and format changes with respect to the previous edition:
– The test chamber from IEC 60068-3-6 has been introduced.
– 4 – 60068-2-78 IEC:2012
The text of this standard is based on the following documents:
FDIS Report on voting
104/582/FDIS 104/588/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.
It has the status of a basic safety publication in accordance with IEC Guide 104.
A list of all the 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 publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
60068-2-78 IEC:2012 – 5 –
INTRODUCTION
This part of IEC 60068 provides a test method of high humidity at constant temperature
without condensation on the specimen over a prescribed period. This test is performed to
evaluate the specimen as it is influenced by the absorption and diffusion of moisture and
moisture vapour.
– 6 – 60068-2-78 IEC:2012
ENVIRONMENTAL TESTING –
Part 2-78: Tests – Test Cab: Damp heat, steady state
1 Scope and object
This part of IEC 60068 establishes a test method for determining the ability of components or
equipment to withstand transportation, storage and use under conditions of high humidity.
The object of this standard is to investigate the effect of high humidity at constant temperature
without condensation on a specimen over a prescribed period.
It is applicable to small equipment or components as well as large equipment, and can be
applied to both heat-dissipating and non-heat-dissipating specimens.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and
are indispensable for its application. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 60068-1, Environmental testing – Part 1:General and guidance
IEC 60068-3-6, Environmental testing – Part 3-6: Supporting documentation and guidance –
Confirmation of the performance of temperature and humidity chambers
IEC Guide 104, The preparation of safety publications and the use of basic safety publications
and group safety publications
3 Terms and definitions
None.
4 General test procedure
4.1 Test chamber and measuring system
The temperature and humidity chamber shall be constructed and verified in accordance with
specifications IEC 60068-3-6.
The chamber and measuring system shall be such that
– sensing devices can be located in the working space t
...
IEC 60068-2-78 ®
Edition 2.0 2012-10
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
BASIC SAFETY PUBLICATION
Environmental testing –
Part 2-78: Tests – Test Cab: Damp heat, steady state
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
your local IEC member National Committee for further information.
IEC Central Office Tel.: +41 22 919 02 11
3, rue de Varembé info@iec.ch
CH-1211 Geneva 20 www.iec.ch
Switzerland
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.
About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigenda or an amendment might have been published.
IEC Catalogue - webstore.iec.ch/catalogue Electropedia - www.electropedia.org
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bibliographical information on IEC International Standards, electrical terms containing 21 000 terms and definitions in
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iPad. Vocabulary (IEV) online.
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The advanced search enables to find IEC publications by a 67 000 electrotechnical terminology entries in English and
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and withdrawn publications. collected from earlier publications of IEC TC 37, 77, 86 and
CISPR.
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details all new publications released. Available online and If you wish to give us your feedback on this publication or
also once a month by email. need further assistance, please contact the Customer Service
Centre: sales@iec.ch.
IEC 60068-2-78 ®
Edition 2.0 2012-10
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Environmental testing –
Part 2-78: Tests – Test Cab: Damp heat, steady state
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 19.040; 29.020 ISBN 978-2-8322-0444-3
IEC 60068-2-78 ®
Edition 2.0 2012-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
BASIC SAFETY PUBLICATION
PUBLICATION FONDAMENTALE DE SÉCURITÉ
Environmental testing –
Part 2-78: Tests – Test Cab: Damp heat, steady state
Essais d’environnement –
Partie 2-78: Essais – Essai Cab: Chaleur humide, essai continu
– 2 – 60068-2-78 IEC:2012
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope and object . 6
2 Normative references . 6
3 Terms and definitions . 6
4 General test procedure . 6
4.1 Test chamber and measuring system . 6
4.2 Severity . 7
4.3 Pre-conditioning . 7
4.4 Testing procedure . 7
4.5 Recovery procedure . 8
5 Measurements . 8
5.1 Initial measurements . 8
5.2 Intermediate measurements . 8
5.3 Final measurements . 8
6 Information to be given in the relevant specification. 8
7 Information to be given in the test report . 9
Table 1 – Temperature and relative humidity . 7
60068-2-78 IEC:2012 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ENVIRONMENTAL TESTING –
Part 2-78: Tests – Test Cab: Damp heat, steady state
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 60068-2-78 has been prepared by technical committee 104:
Environmental conditions, classification, and methods of test.
This second edition cancels and replaced the first edition, published in 2001 and constitutes a
technical revision.
This edition includes editorial and format changes with respect to the previous edition:
– The test chamber from IEC 60068-3-6 has been introduced.
– 4 – 60068-2-78 IEC:2012
The text of this standard is based on the following documents:
FDIS Report on voting
104/582/FDIS 104/588/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.
It has the status of a basic safety publication in accordance with IEC Guide 104.
A list of all the 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 publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
60068-2-78 IEC:2012 – 5 –
INTRODUCTION
This part of IEC 60068 provides a test method of high humidity at constant temperature
without condensation on the specimen over a prescribed period. This test is performed to
evaluate the specimen as it is influenced by the absorption and diffusion of moisture and
moisture vapour.
– 6 – 60068-2-78 IEC:2012
ENVIRONMENTAL TESTING –
Part 2-78: Tests – Test Cab: Damp heat, steady state
1 Scope and object
This part of IEC 60068 establishes a test method for determining the ability of components or
equipment to withstand transportation, storage and use under conditions of high humidity.
The object of this standard is to investigate the effect of high humidity at constant temperature
without condensation on a specimen over a prescribed period.
It is applicable to small equipment or components as well as large equipment, and can be
applied to both heat-dissipating and non-heat-dissipating specimens.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and
are indispensable for its application. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 60068-1, Environmental testing – Part 1:General and guidance
IEC 60068-3-6, Environmental testing – Part 3-6: Supporting documentation and guidance –
Confirmation of the performance of temperature and humidity chambers
IEC Guide 104, The preparation of safety publications and the use of basic safety publications
and group safety publications
3 Terms and definitions
None.
4 General test procedure
4.1 Test chamber and measuring system
The temperature and humidity chamber shall be constructed and verified in accordance with
specifications IEC 60068-3-6.
The chamber and measuring system shall be such that
– sensing devices can be located in the working space to monitor the temperature and
humidity,
NOTE For heat-dissipating specimens, the temperature and humidity near the specimen may be influenced by
the effect of heat dissipation from the specimen.
– condensed water is drained from the chamber and not re-used unless purified,
– no condensed water from the walls and roof of the test chamber can fall on the
specimen(s),
60068-2-78 IEC:2012 – 7 –
– water utilized to maintain humidity levels has electrical conductivity of not more than
20 µS/cm,
– the specimen under test shall not be subjected to radiant heat from the chamber
conditioning devices,
– injected moisture, when applicable, is injected remotely from the specimen and without
being directly on it,
– the volume of the test chamber is at least five times the total volume of the specimen
under test,
– a mounting device, when used, has minimum influence on the heat and humidity
exchanges between specimen and surrounding conditions, unless otherwise specified in
the relevant specification.
4.2 Severity
The test severity is defined by a combination of temperature, relative humidity (RH) and total
test duration. Unless otherwise specified in the relevant specification, temperature and RH
severities may be selected from the following:
Table 1 – Temperature and relative humidity
Temperature Relative humidity
°C % RH
30 ± 2 93 ± 3
30 ± 2 85 ± 3
40 ± 2 93 ± 3
40 ± 2 85 ± 3
Preferred test durations are: 12 h, 16 h, 24 h; 2 days, 4 days, 10 days, 21 days or 56 days.
The total temperature tolerance of ± 2 K is intended to take account of absolut
...
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