Environmental testing - Part 2-78: Tests - Test Cab: Damp heat, steady state

IEC 60068-2-78:2012 is available as IEC Standards+ 60068-2-78:2012 which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.
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 est disponible sous forme de IEC 60068-2-78:2012 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.
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.

General Information

Status
Published
Publication Date
29-Oct-2012
Current Stage
PPUB - Publication issued
Start Date
30-Oct-2012
Completion Date
30-Oct-2012
Ref Project

Buy Standard

Standard
IEC 60068-2-78:2012 - Environmental testing - Part 2-78: Tests - Test Cab: Damp heat, steady state
English and French language
17 pages
sale 15% off
Preview
sale 15% off
Preview

Standards Content (sample)

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
IEC 60068-2-78:2012
---------------------- Page: 1 ----------------------
THIS PUBLICATION IS COPYRIGHT PROTECTED
Copyright © 2012 IEC, Geneva, Switzerland

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.

Droits de reproduction réservés. Sauf indication contraire, aucune partie de cette publication ne peut être reproduite ni

utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie et les

microfilms, sans l'accord écrit de la CEI ou du Comité national de la CEI du pays du demandeur.

Si vous avez des questions sur le copyright de la CEI ou si vous désirez obtenir des droits supplémentaires sur cette

publication, utilisez les coordonnées ci-après ou contactez le Comité national de la CEI de votre pays de résidence.

IEC Central Office Tel.: +41 22 919 02 11
3, rue de Varembé Fax: +41 22 919 03 00
CH-1211 Geneva 20 info@iec.ch
Switzerland www.iec.ch
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.
Useful links:

IEC publications search - www.iec.ch/searchpub Electropedia - www.electropedia.org

The advanced search enables you to find IEC publications The world's leading online dictionary of electronic and

by a variety of criteria (reference number, text, technical electrical terms containing more than 30 000 terms and

committee,…). definitions in English and French, with equivalent terms in

It also gives information on projects, replaced and additional languages. Also known as the International

withdrawn publications. Electrotechnical Vocabulary (IEV) on-line.

IEC Just Published - webstore.iec.ch/justpublished Customer Service Centre - webstore.iec.ch/csc

Stay up to date on all new IEC publications. Just Published If you wish to give us your feedback on this publication

details all new publications released. Available on-line and or need further assistance, please contact the

also once a month by email. Customer Service Centre: csc@iec.ch.
A propos de la CEI

La Commission Electrotechnique Internationale (CEI) est la première organisation mondiale qui élabore et publie des

Normes internationales pour tout ce qui a trait à l'électricité, à l'électronique et aux technologies apparentées.

A propos des publications CEI

Le contenu technique des publications de la CEI est constamment revu. Veuillez vous assurer que vous possédez

l’édition la plus récente, un corrigendum ou amendement peut avoir été publié.
Liens utiles:

Recherche de publications CEI - www.iec.ch/searchpub Electropedia - www.electropedia.org

La recherche avancée vous permet de trouver des Le premier dictionnaire en ligne au monde de termes

publications CEI en utilisant différents critères (numéro de électroniques et électriques. Il contient plus de 30 000

référence, texte, comité d’études,…). termes et définitions en anglais et en français, ainsi que

Elle donne aussi des informations sur les projets et les les termes équivalents dans les langues additionnelles.

publications remplacées ou retirées. Egalement appelé Vocabulaire Electrotechnique

International (VEI) en ligne.
Just Published CEI - webstore.iec.ch/justpublished
Service Clients - webstore.iec.ch/csc
Restez informé sur les nouvelles publications de la CEI.

Just Published détaille les nouvelles publications parues. Si vous désirez nous donner des commentaires sur

Disponible en ligne et aussi une fois par mois par email. cette publication ou si vous avez des questions

contactez-nous: csc@iec.ch.
---------------------- Page: 2 ----------------------
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

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.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 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

---------------------- Page: 4 ----------------------
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.
---------------------- Page: 5 ----------------------
– 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.
---------------------- Page: 6 ----------------------
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.
---------------------- Page: 7 ----------------------
– 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),
---------------------- Page: 8 ----------------------
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 absolute errors in the

measurement, slow changes of temperature and temperature variations of the working space.

However, in order to maintain the RH within the required tolerances, it is necessary to keep

the temperature difference between any two points in the working space at any moment within

narrower limits. The required humidity conditions will not be achieved if such temperature

differences exceed 1 K. It may also be necessary to keep short-term fluctuations within

± 0,5 K to maintain the required humidity.
4.3 Pre-conditioning
The relevant specification may call for pre-conditioning.
4.4 Testing procedure

The specimen shall be introduced into the chamber as required by the relevant specification.

The specimen shall be introduced in the unpacked, switched-off, ready-for-use state, or as

otherwise specified in the relevant specification.

In certain cases the relevant specification may allow the introduction of the specimen in the

chamber when this is already in the condition prescribed for the test; however, condensation

on the specimen shall always be avoided. This can be obtained for small specimens by pre-

heating them to the chamber temperature.

Adjust the temperature in the chamber to the prescribed severity. In order to avoid

condensation on the specimen, control the specimen temperature or allow the specimen to

reach the temperature first and then adjust the humidity in the chamber to the prescribed

severity.
---------------------- Page: 9 ----------------------
– 8 – 60068-2-78  IEC:2012

Adjust the humidity to the prescribed severity within a period of time of not more than 2 h.

Expose the specimen to the test conditions and duration as specified in the relevant

specification. The duration is measured from the time the specified conditions are achieved.

The relevant specification shall define the operating conditions and the period (or periods) in

which they shall be carried out.

After conditioning at the prescribed severity and before the final measurement, the recovery

procedure shall be followed.
4.5 Recovery procedure

The relevant specification shall prescribe the recovery method and duration. Recovery

conditions are described in IEC 60068-1.
5 Measurements
5.1 Initial measurements

The specimen shall be visually inspected and electrically and mechanically checked, as

required by the relevant specification.
5.2 Intermediate measurements

The relevant specification may call for measurements during the test procedure while the

specimen is still in the chamber. If such measurements are required, the relevant specification

shall define the measurements and the period (periods) at which they shall be carried out. For

these measurements, the specimen shall not be removed from the chamber.
5.3 Final measurements

The specimen shall be visually inspected and electrically and mechanically checked, as

required by the relevant specification.
6 Information to be given in the relevant specification
The following det
...

Questions, Comments and Discussion

Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.