SIST EN 60068-2-2:2008

Environmental testing -- Part 2-2: Tests - Test B: Dry heat

This standard deals with dry heat tests applicable both to heat-dissipating and non heatdissipating specimens. For non heat-dissipating specimens, Tests Bb and Bd do not deviate essentially from earlier issues. The object of the dry heat test is limited to the determination of the ability of components, equipment or other articles to be used, transported or stored at high temperature. These dry heat tests do not enable the ability of specimens to withstand or operate during the temperature variations to be assessed. In this case, it would be necessary to use IEC 60068- 2-14 Test N: Change of temperature. The dry heat tests are subdivided as follows: Dry heat test for non heat-dissipating specimens - with gradual change of temperature, Bb. Dry heat tests for heat-dissipating specimens - with gradual change of temperature, Bd; - with gradual change of temperature, specimen powered throughout, Be. The procedures given in this standard are normally intended for specimens that achieve temperature stability during the performance of the test procedure.

Umgebungseinflüsse - Teil 2-2: Prüfverfahren - Prüfung B: Trockene Wärme

Essais d'environnement -- Partie 2-2: Essais - Essai B: Chaleur sèche

Traite des essais de chaleur sèche applicables à la fois aux spécimens dissipant de l'énergie et à ceux ne dissipant pas d'énergie. Les essais Bb et Bd destinés à des spécimens ne dissipant pas d'énergie ne présentent pas de modifications importantes par rapport aux éditions précédentes. Le but de l'essai de chaleur sèche se limite à la détermination de l'aptitude des composants, équipements ou autres articles à être utilisés, transportés ou stockés à haute température. Ces essais de chaleur sèche ne permettent pas de vérifier l'aptitude des spécimens à subir ou à fonctionner pendant les variations de température. Dans ce cas, il serait nécessaire d'utiliser l'essai N de la CEI 60068-2-14: Variations de température. Les essais de chaleur sèche se subdivisent de la façon suivante: Essai de chaleur sèche pour spécimens ne dissipant pas d'énergie - avec variation lente de la température, Bb. Essais de chaleur sèche pour spécimens dissipant de l'énergie - avec variation lente de la température, Bd; - avec variation lente de la température, pour les spécimens dissipant partout, Be. La procédure décrite dans cette norme est normalement prévue pour les spécimens qui atteignent la stabilité thermique pendant le déroulement de l'essai. Les principaux changements par rapport à l'édition précédente sont les suivants: Les essais Ba et Bc ont été retirés puisqu'ils étaient plus sévères que l'essai Nb de la CEI 60068 2 14: Variations de température. Deuxièmement, il a été considéré justifié de supprimer la valeur de 3 % sur la différence de température entre l'air de la chambre d'essai et les températures des parois. Troisièmement, il est proposé et non plus exigé que le spécimen d'essai soit mis en fonctionnement durant l'essai; et, pour finir, les annexes ont été retirées. A le statut d'une publication fondamentale de sécurité, conformément au Guide CEI 104

Okoljsko preskušanje - 2-2. del: Preskusi - Preskusi B: Suha vročina (IEC 60068-2-2:2007)

General Information

• Status: Published
• Publication Date: 28-Nov-2007
• ICS: 19.040 - Environmental testing
• Technical Committee: I09 - Imaginarni 09
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 09-Oct-2007
• Due Date: 14-Dec-2007
• Completion Date: 29-Nov-2007
• Directive: 2014/32/EU - Directive 2014/32/EU of the European Parliament and of the Council of 26 February 2014 on the harmonisation of the laws of the Member States relating to the making available on the market of measuring instruments
• Ref Project: EN 60068-2-2:2007 - Environmental testing - Part 2-2: Tests - Test B: Dry heat

Relations

• Replaces: SIST EN 60068-2-2:2002 + A1:2002 - Basic environmental testing procedures -- Part 2: Tests - Tests B: Dry heat
• Effective Date: 01-Sep-2010
• Replaces: SIST EN 60068-2-2:2002 + A1:2002 - Basic environmental testing procedures -- Part 2: Tests - Tests B: Dry heat
• Effective Date: 28-Jan-2023
• Replaces: SIST EN 60068-2-2:2001/A2:2001 - Basic environmental testing procedures -- Part 2: Tests - Tests B: Dry heat
• Effective Date: 01-Sep-2010
• Replaces: SIST EN 60068-2-2:2001/A2:2001 - Basic environmental testing procedures -- Part 2: Tests - Tests B: Dry heat
• Effective Date: 29-Jan-2023

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN 60068-2-2:2008
01-januar-2008
1DGRPHãþD
SIST EN 60068-2-2:2002 + A1:2002
2NROMVNRSUHVNXãDQMHGHO3UHVNXVL3UHVNXVL%6XKDYURþLQD,(&

Environmental testing - Part 2-2: Tests - Tests B: Dry heat
Umgebungseinflüsse - Teil 2-2: Prüfverfahren - Prüfung B: Trockene Wärme
Essais d'environnement - Partie 2-2: Essais - Essai B: Chaleur seche
Ta slovenski standard je istoveten z: EN 60068-2-2:2007
ICS:
19.040 Preskušanje v zvezi z Environmental testing
okoljem
SIST EN 60068-2-2:2008 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------

EUROPEAN STANDARD
EN 60068-2-2

NORME EUROPÉENNE
September 2007
EUROPÄISCHE NORM

ICS 19.040 Supersedes EN 60068-2-2:1993 + A1:1993 + A2:1994


English version


Environmental testing -
Part 2-2: Tests -
Test B: Dry heat
(IEC 60068-2-2:2007)


Essais d'environnement -  Umgebungseinflüsse -
Partie 2-2: Essais - Teil 2-2: Prüfverfahren -
Essai B: Chaleur sèche Prüfung B: Trockene Wärme
(CEI 60068-2-2:2007) (IEC 60068-2-2:2007)




This European Standard was approved by CENELEC on 2007-09-01. 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 Central Secretariat 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 Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, 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

Central Secretariat: rue de Stassart 35, B - 1050 Brussels


© 2007 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 60068-2-2:2007 E

---------------------- Page: 2 ----------------------

EN 60068-2-2:2007 - 2 -
Foreword
The text of document 104/412/FDIS, future edition 5 of IEC 60068-2-2, prepared by IEC TC 104,
Environmental conditions, classification and methods of test, was submitted to the IEC-CENELEC parallel
vote and was approved by CENELEC as EN 60068-2-2 on 2007-09-01.
This European Standard supersedes EN 60068-2-2:1993 + A1:1993 + A2:1994.
The main changes from EN 60068-2-2:1993 + A1:1993 + A2:1994 are as follows: Tests Ba and Bc have
been deleted since they were more severe tests than Test Nb, EN 60068-2-14: Change of temperature.
Secondly it was considered justified to delete the 3 % value on the temperature difference between the
chamber air and the wall temperatures. Thirdly it is proposed that the test specimen be powered
throughout the test where required; and, finally, the annexes have been removed.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2008-06-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2010-09-01
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 60068-2-2:2007 was approved by CENELEC as a European
Standard without any modification.
__________

---------------------- Page: 3 ----------------------

- 3 - EN 60068-2-2:2007
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

1)
IEC 60068-1 1988 Environmental testing - EN 60068-1 1994
Part 1: General and guidance


2) 3)
IEC 60068-3-1 - Environmental testing - EN 60068-3-1 1999
Part 3: Background information -
Section One: Cold and dry heat tests


2) 3)
IEC 60068-3-5 - Environmental testing - EN 60068-3-5 2002
Part 3-5: Supporting documentation and
guidance - Confirmation of the performance
of temperature chambers


2) 3)
IEC 60068-3-7 - Environmental testing - EN 60068-3-7 2002
Part 3-7: Supporting documentation and
guidance - Measurements in temperature
chambers for tests A and B (with load)


2) 3)
IEC 60068-5-2 - Environmental testing - EN 60068-5-2 1999
Part 5: Guide to drafting of test methods -
Terms and definitions


IEC 60721 Series Classification of environmental conditions EN 60721 Series




1)
EN 60068-1 includes A1:1992 to IEC 60068-1 + corr. October 1988.
2)
Undated reference.
3)
Valid edition at date of issue.

---------------------- Page: 4 ----------------------

IEC 60068-2-2
Edition 5.0 2007-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
BASIC SAFETY PUBLICATION
PUBLICATION FONDAMENTALE DE SÉCURITÉ
Environmental testing –
Part 2-2: Tests – Test B: Dry heat

Essais d’environnement –
Partie 2-2: Essais – Essai B: Chaleur sèche

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
N
CODE PRIX
ICS 19.040 ISBN 2-8318-9229-5

---------------------- Page: 5 ----------------------

– 2 – 60068-2-2 © IEC:2007
CONTENTS
FOREWORD.4
INTRODUCTION.6

1 Scope.7
2 Normative references .7
3 Terms and definitions .8
4 Application of tests for non heat-dissipating specimens versus tests for heat-
dissipating specimens .8
4.1 General .8
4.2 Ascertaining high or low air velocity in the test chamber.8
4.3 Application of tests with sudden change of temperature versus tests with
gradual change of temperature.9
4.4 Testing of heat-dissipating specimens .9
4.5 Temperature monitoring .9
4.6 Packaging .9
4.7 Diagrammatic representations .9
5 Test descriptions .10
5.1 General .10
5.2 Test Bb: Dry heat for non heat-dissipating specimens with gradual change of
temperature.10
5.2.1 Object .10
5.2.2 General description .11
5.3 Test Bd: Dry heat for heat-dissipating specimens with gradual change of
temperature that are not powered during the conditioning period.11
5.3.1 Object .11
5.3.2 General description .11
5.3.3 Energising the specimen .11
5.4 Test Be: Dry heat for heat-dissipating specimens with gradual change of
temperature that are required to be powered throughout the test.11
5.4.1 Object .11
5.4.2 General description .12
6 Test procedure .12
6.1 Confirmation of performance .12
6.2 Working space .12
6.3 Thermal radiation .12
6.4 Mounting .13
6.5 Severities .13
6.5.1 General .13
6.5.2 Temperature.13
6.5.3 Duration .13
6.6 Preconditioning .13
6.7 Initial measurements .13
6.8 Conditioning .13
6.8.1 Steady state conditions .13
6.8.2 Absolute humidity .14
6.9 Intermediate measurements .14
6.10 Final temperature ramp .14

---------------------- Page: 6 ----------------------

60068-2-2 © IEC:2007 – 3 –
6.11 Recovery.14
6.12 Specimen with artificial cooling.14
6.13 Final measurements .14
7 Information to be given in the relevant specification .15
8 Information to be given in the test report .15

Figure 1 – Block diagram Tests B: Dry Heat.10

---------------------- Page: 7 ----------------------

– 4 – 60068-2-2 © IEC:2007
INTERNATIONAL ELECTROTECHNICAL COMMISSION
______________

ENVIRONMENTAL TESTING –

Part 2-2: Tests – Test B: Dry heat


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 provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
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 60068-2-2 has been prepared by IEC technical committee 104:
Environmental conditions, classification and methods of test.
This fifth edition of IEC 60068-2-2 cancels and replaces the fourth edition issued in 1974. It
includes the revised text of the fourth edition, amendment 1 issued in 1993 and amendment 2
issued in 1994.
It has the status of a basic safety publication in accordance with IEC Guide 104.
The main changes from the previous edition are as follows: Tests Ba and Bc have been
deleted since they were more severe tests than Test Nb, IEC 60068-2-14: Change of
temperature. Secondly it was considered justified to delete the 3 % value on the temperature
difference between the chamber air and the wall temperatures. Thirdly it is proposed that the
test specimen be powered throughout the test where required; and, finally, the annexes have
been removed.

---------------------- Page: 8 ----------------------

60068-2-2 © IEC:2007 – 5 –
The text of this standard is based on the following documents:
FDIS Report on voting
104/412/FDIS 104/430/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 standard has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all the parts of 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 maintenance result 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: 9 ----------------------

– 6 – 60068-2-2 © IEC:2007
INTRODUCTION
RELATIONSHIP OF SUFFIXES BETWEEN TESTS A: COLD,
AND TESTS B: DRY HEAT
The relationship of suffixes between Tests A: Cold, and Tests B: Dry heat, is shown in the
following table:

Tests A: Cold Tests B: Dry heat
Suffix Specimen Temperature Air velocity Specimen Temperature Air velocity
letter type change type change
a Withdrawn Withdrawn


b Non heat Gradual High preferred Non heat Gradual High preferred
c Withdrawn Withdrawn


d Heat Gradual Low preferred Heat Gradual Low preferred
dissipating
e Heat Gradual Low preferred Heat, Gradual Low preferred
dissipating powered
powered throughout
throughout

---------------------- Page: 10 ----------------------

60068-2-2 © IEC:2007 – 7 –
ENVIRONMENTAL TESTING –

Part 2-2: Tests – Test B: Dry heat



1 Scope
This standard deals with dry heat tests applicable both to heat-dissipating and non heat-
dissipating specimens. For non heat-dissipating specimens, Tests Bb and Bd do not deviate
essentially from earlier issues.
The object of the dry heat test is limited to the determination of the ability of components,
equipment or other articles to be used, transported or stored at high temperature.
These dry heat tests do not enable the ability of specimens to withstand or operate during the
temperature v
...

SLOVENSKI oSIST prEN 60068-2-2:2005

PREDSTANDARD
julij 2005
Okoljsko preskušanje – 2-2. del: Preskusi – Preskusi B: Suha vročina
Environmental testing – Part 2-2: Tests – Tests B: Dry heat
ICS 19.040 Referenčna številka
oSIST prEN 60068-2-2:2005(en)
©  Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljeno

---------------------- Page: 1 ----------------------
104/371/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJET DE COMITÉ POUR VOTE (CDV)
Project number IEC 60068-2-2 Ed. 5.0
Numéro de projet

Date of circulation Closing date for voting (Voting
IEC/TC or SC:
104
Date de diffusion mandatory for P-members)
CEI/CE ou SC:

Date de clôture du vote (Vote
2005-05-06
obligatoire pour les membres (P))
2006-10-07
Titre du CE/SC:    TC/SC Title: Environmental Conditions,
classification and methods of test
Secretary: Alf Olsson, Sweden
Secrétaire:
Also of interest to the following committees Supersedes document
Intéresse également les comités suivants Remplace le document
Almost every product related IEC Committee 104/317/CD – 104/370/MCR
Functions concerned
Fonctions concernées
Safety EMC Environment Quality assurance
Sécurité
CEM Environnement Assurance qualité
CE DOCUMENT EST TOUJOURS À L'ÉTUDE ET SUSCEPTIBLE DE THIS DOCUMENT IS STILL UNDER STUDY AND SUBJECT TO CHANGE. IT
MODIFICATION. IL NE PEUT SERVIR DE RÉFÉRENCE. SHOULD NOT BE USED FOR REFERENCE PURPOSES.
LES RÉCIPIENDAIRES DU PRÉSENT DOCUMENT SONT INVITÉS À RECIPIENTS OF THIS DOCUMENT ARE INVITED TO SUBMIT, WITH THEIR
PRÉSENTER, AVEC LEURS OBSERVATIONS, LA NOTIFICATION DES COMMENTS, NOTIFICATION OF ANY RELEVANT PATENT RIGHTS OF
DROITS DE PROPRIÉTÉ DONT ILS AURAIENT ÉVENTUELLEMENT WHICH THEY ARE AWARE AND TO PROVIDE SUPPORTING
CONNAISSANCE ET À FOURNIR UNE DOCUMENTATION EXPLICATIVE. DOCUMENTATION.

Titre : Essais d'environnement - Partie 2-2: Title : Environmental testing – Part 2-2: Tests –
Essais - Essais B: Chaleur sèche Tests B: Dry Heat

Introductory note
The Maintenance Team, MT 16 of IEC TC 104 has reviewed this basic IEC Test at several meetings and over a long period of time. The work with the first
CD started in Helsinki, February 2002 and continued until the Lindenstruth meeting in April 2003 where it was decided to reformat both the style and the
nd
presentation. The comments received on the 2 CD was presented in Kyoto in November the same year but was only introduced in the draft for a CDV in
Massa Martana in October 2004. Although the MT realised that the basis for making major changes of the document was little it still felt it necessary to go
ahead with the changes announced in both CDs and in the relevant MCRs. Consequently MT 16 have deleted tests Ba and Bc since they were more
severe test than Test Nb, IEC 60068-2-14: Change of temperature.
Secondly it was considered justified to delete the 3% value on the temperature difference between the chamber air and the wall temperatures;
Thirdly it is proposed that the test specimen be powered throughout the test were required to and; finally the annexes are removed

Finally a message from the experts of TC 104:
When the revision of IEC 60068-2-1 and 60068-2-2 have been successfully concluded then MT 16 intends to review IEC 60068-3-1.

IF YOU CARE ABOUT THE WORK, THEN YOU SHOULD PARTICIPATE?
Either you come to us or we come to you.
IF YOU AGREE WITH WHAT WE ARE DOING? THEN YOU MUST CONTRIBUTE BY SENDING COMMENTS.
IF YOU DON’T CARE or DON’T AGREE and DON’T PARTICIPATE then there will soon be
NO ONE LEFT TO DO THE JOB FOR YOU.
This project was cancelled in October 2004, see SMB/2924/DL, prior to circulation of the compilation of
comments on 104/317/CD.
The comments are attached in Annex A for information.
ATTENTION ATTENTION

CDV soumis en parallèle au vote (CEI) Parallel IEC CDV/CENELEC Enquiry
et à l’enquête (CENELEC)

Copyright © 2005 International Electrotechnical Commission, IEC. All rights reserved. It is
permitted to download this electronic file, to make a copy and to print out the content for the sole
purpose of preparing National Committee positions. You may not copy or "mirror" the file or
printed version of the document, or any part of it, for any other purpose without permission in
writing from IEC.
FORM CDV (IEC) 2002-08-09

---------------------- Page: 2 ----------------------
– 2 – 104/371/CDV
IEC 60068-2-2 Ed.5.0 was cancelled in October 2004, see SMB/2924/DL, prior to circulation of the compilation of comments on 104/317/CD.
The comments are attached below for information.

Annex A
Date Document
2004 104/317/CD

National Clause/ Paragraph Type of comment COMMENTS Proposed change OBSERVATIONS OF THE SECRETARIAT
Committee Subclause Figure/Table (General/ on each comment submitted
Technical/Editorial)
FR1 0  The French National Committee Noted
supports the above document, and
submits the following comment.
PL1 0 General The Polish NC supports removal of Agreed
the test method A and B from Test Bc
and Bd, as well as the numerous
discussions on specific cases
(annexes).
US1 0 Editorial Redundant Presentation - an Reduce redundancies Agreed - The style will be changed to align
expected outcome was a more with IEC 60068-2-1
compact standard, easier to read.
US2 0 Editorial Headers from page 16 reference Change to 60068-2-2 Agreed
60068-2-1
US3 0 Editorial Correct spelling to “fit” Agreed
General description of the test:
"fit" instead of "fir" in the second line
US4 Editorial Figure is not labelled Agreed
0 Fig. "C" should be marked on
figure
US12 0 NEW Technical PreConditioning through Final Create a new Clause, " Agreed
Measurement should be under Test Procedure"
"Procedure" or "Test Procedure"
US13 0 NEW Technical Create an outline test procedure for Create an outline test Not agreed the basic test procedure is
Non-heat dissipating specimens: procedure for Non-heat common for all tests
dissipating specimens:
Preconditioning, Initial
Measurements,
Conditioning, Steady State
Conditions, Intermediate
Measurements, Recovery,
Final Measurements,
US14 0 NEW Technical Create an outline test procedure for Create an outline test Not agreed the basic test procedure is
Heat-dissipating specimens: procedure for Heat- common for all tests
dissipating specimens:
Preconditioning, Initial
Measurements,
Conditioning, Steady State
2

---------------------- Page: 3 ----------------------
– 3 – 104/371/CDV
National Clause/ Paragraph Type of comment COMMENTS Proposed change OBSERVATIONS OF THE SECRETARIAT
Committee Subclause Figure/Table (General/ on each comment submitted
Technical/Editorial)
Conditions, Intermediate
Measurements, Final
Temperature Ramp,
Recovery, Test conditions
applicable when more than
one specimen is tested in
the chamber and Specimen
with artificial cooling, Final
Measurements
CZ1 0 General, editorial This is standard for dry heat tests but Check all occurrences of Agreed
an many places in the draft, it is expression “low
written “low temperature” instead of temperature” and correct
“high temperature” and “temperature them to “high temperature”
is raised” instead of “temperature is or “elevated temperature”,
declined”. and occurrences of
“temperature is raised” to
“temperature is declined”.
SP1 0 General From page 15, the standard number 60068-2-2 Agreed
Editorial is wrong (60068-2-1)
FI1 0 General 1. The test Ba and Bc are very rarely Noted – Test Ba and Bc will be withdrawn.
used The requirement for test Be was identified
2. No effect to test result by TC 104 WG1 in its list of deficiencies
3. No need for the test Be, because produced when formulating the IEC 60721-
you can use test Ad and specify in 4 standards.
the relevant specification the state of
the specimen during testing.
4. OK
IT1 0 General The document 104/316/CD is very Merge the common Noted
requirements and renumber
well done since the common
the clause references
requirements have been merged
according to the method
and the clause references have
used with the other 60068-
been aligned to the other 60068-2
2 standards.
standards.
0  Noted
GB No Comments
0  Noted
NL We agree and have no comments
US6 5,3 - 5,11 Editorial For each test variant (Ba, Bb, Bc, Bd, Consolidate the multiple Agreed
6,3 - 6,11 Be) these identical clauses do NOT copies of these identical
7,3 - 7,9, change: Severities, Preconditioning, clauses and refer to them.
7,11, Initial Measurements, Conditioning,
7,14, Steady State Conditions,
8,3 - 8,9, Intermediate Measurements,
8,11, Recovery, Final Measurements,
8,14, Information to be given in the relevant
3

---------------------- Page: 4 ----------------------
– 4 – 104/371/CDV
National Clause/ Paragraph Type of comment COMMENTS Proposed change OBSERVATIONS OF THE SECRETARIAT
Committee Subclause Figure/Table (General/ on each comment submitted
Technical/Editorial)
9,3 - 9,9, specification and Information to be
9,11, 9,14 given in the test report.
CZ2 2 Editorial Subtitles of standards is necessary to IEC 60068-3-1: Agreed
write with upper case letter. Environmental testing –
Part 3: Background
information – Section One:
Cold and dry heat tests.
IEC 60068-3-5:
Environmental testing –
Part 3.5: Supporting
documentation and
guidance – Conformation of
the performance of
temperature chambers.
IEC 60068-3-7:
Environmental testing –
Part 3.7: Supporting
documentation and
guidance – Measurements
in temperature chambers
for tests A and B with load.
PL2 2 Technical Add IEC 60068-2-14 Agreed
referred to in clause 1 and
IEC 60721 referred to in
5.4.
st
CZ3 4 1 sentence Technical But in subclause 4.3 of IEC 60068-1, A specimen is considered Agreed
“heat-dissipating specimen” is defined heat-dissipating only if the
as specimen with hottest point hottest point on its surface,
temperature of more then 5 K (not measured in free air
3 K) above the ambient temperature. conditions (i.e. with low air
velocity circulation), is
more than 5 K above the
ambient temperature of the
surrounding atmosphere
after temperature stability
has been reached (see 4.8
of IEC 60068-1).
FI2 4  The specimen is considered heat- more than 5 K Agreed
dissipating if the temperature of the
hotest point is more than 3 K above
the ambient temperature. Should it be
5 K, beacause 3 K temperature
difference is achieved very easy and
its might be diffucult to divide
4

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National Clause/ Paragraph Type of comment COMMENTS Proposed change OBSERVATIONS OF THE SECRETARIAT
Committee Subclause Figure/Table (General/ on each comment submitted
Technical/Editorial)
specimens non heat-dissipating or
heat-dissipating specimens.
PL3 4,1 line 3 Editorial Correct „Test Aa” to „Test Agreed
Ba”.
st
Under standard Agreed
CZ4 4,3 1 sentence Technical, editorial “Laboratory standard conditions” are
not defined in IEC 60068-1; defined atmospheric conditions for
conditions are “standard atmospheric measurement and tests
conditions for measurement and with an air velocity <0,2
tests” according to 5.3.1 of IEC m/s, the specimen shall be
60068-1. switched on or electrically
It is necessary to use decimal loaded as specified for the
comma. high temperature at which
“High temperature” should be written the test is to be carried out.
instead of “low temperature”.
PL4 4,3 First line Editorial The first sentence should begin with: „In the chamber under.” Not agreed
PL5 4,3 Line 2 Technical Correct „low temperature” Agreed
5,1 Line 3 and to „high temperature”.
5
CZ5 4,6 Figure 1 Technical As Bc is test with sudden change of Interchange “No” and “Yes” Agreed
temperature and Bd and Be are tests at right decide block
with gradual change of temperature, “Sudden change of
denotations “No” and “Yes” at right temperature?” or change its
decide block “Sudden change of text to “Gradual change of
temperature?” shall be interchanged. temperature?”
CZ6 4,6 Figure 1 Editorial There is superfluous text above the Delete superfluous text Agreed
figure. above the figure.
Text in right bottom decide block is Modify following text
partly illegible. editorially:
„Powered during
conditioning
period?“
FI3 4,6 Figure 1 The test Bc is used when sudden Change in the diagram YES Agreed
change of temperature achieved. and NO.
FR2 4,6 Fig. 1 Technical In the documents 104/316/CD and In order to be consistent Agreed
104/317/CD, relationship suffixes beween the two
between tests A "Cold" and B "Dry documents, please proceed
heat" are identical: to the verification.
- “d”: with gradual change of The answers “Yes” to the
temperature that are not powered test “powered during the
during the conditioning period conditioning period?”
- “e”: with gradual change of should be Ae and Be.
temperature that are required to
be powered throughout the test.
5

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National Clause/ Paragraph Type of comment COMMENTS Proposed change OBSERVATIONS OF THE SECRETARIAT
Committee Subclause Figure/Table (General/ on each comment submitted
Technical/Editorial)
CZ7 5,1 Editorial “High temperature” should be instead To provide a standard test Agreed
of “low temperature”. .under conditions of high
temperature and .
This procedure is for
specimens which are
subjected to a high
temperature .
SP2 5,1 § 1 General The term “low temperature” is wrong . elevated temperature . Agreed
5,1 § 2 Technical
6,1 § 2
6,8,1 § 1
8,1 § 1
PL11 5,12 Technical Add reference numbers of Not agreed
the relevant clauses.
PL12 5,12 Technical Add the following new item: x) Mounting should be Agreed
added
DE1 5,13 Item General The consideration of the items in the In the parentheses should
6,13 test report shall be restricted in some be added
cases.
7,16 5.  (. if required by the Not Agreed – required by ISO/IEC 17025
8,16 customer only)

9,16 7  (. if existing) Agreed

 8.  (. details only if agreed by Not Agreed – required by ISO/IEC 17025
the customer)

 9.  (. if not certified by the Not Agreed – required by IEC 60068-3
manufacturer) series
 10.  (. if relevant to the actual Not Agreed – required by ISO/IEC 17025
testing process)
 16.  (. if relevant to the Not agreed
performance of the
specimen(s) )

 15. Editorial ”Test Severities” meaning is unclear Data on the specimen(s) Agreed
in the present context under test
(operating, measuring,
monitoring etc.)

 xx. Technical A new item should be added xx. Data on test equipment Agreed
concerning the use of equipment and software provided by
provided by the customer e.g. the customer or a third
person (if relevant)
6

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National Clause/ Paragraph Type of comment COMMENTS Proposed change OBSERVATIONS OF THE SECRETARIAT
Committee Subclause Figure/Table (General/ on each comment submitted
Technical/Editorial)
CZ11 5,10,2 Technical No droplets occur during dry heat Delete this subclause and Agreed
test. renumber the others.
CZ10 5,4 Technical There is missing a tolerance of The severities, as indicated Part agreed Temperature tolerance to be
severity temperature. by temperature and given in the working space sub section of
duration of exposure, shall the test procedure
be prescribed by the
relevant specification and
the temperature shall be
within ±3 K.
IT2 5,4 Technical In our opinion the sentences in the Delete item b and c Not agreed – product committees may need
items b and c will lead to a too wide non preferred severities
number of choices.
CZ8 5,3,2,2 Editorial Text of first sentence is to be stated 5.3.2.2 The temperature of Agreed
more precisely. incident air delivered to the
test specimen shall be
within ± 3 K of test severity
temperature during the
steady state conditions.
CZ9 5,3,2,2 NOTE Technical Note relates to cold test (IEC 60068- Reword or delete the note. Agreed
2-1, see 104/316/CD)
PL6 5,3,2,2 Technical The text should be replaced Agreed – Paragraph to be reworded
with the text existing in
9.3.2.1.
PL7 5,3,2,2 Note Technical Delete the Note - not See PL6
applicable here.
PL8 5,7,1 Para 2 Editorial Move the second Agreed
paragraph to 5.3.5.
PL10 5,8 Title Technical For conformity with Figure 1 and to „Steady state conditioning Not agreed- this is not a conditioning period
show that it is an integral part of the period” it is the test.
conditioning, the title should be
changed to read:
PL9 5,7,3 Para 2 Editorial Amend this sentence to read: „If required by the relevant Agreed
specification, for steady
state conditioning period
the specimen.”
nd
CZ12 6,1 2 para Editorial “High temperature” should be instead This procedure is for Agreed
of “low temperature”. specimens which are
subjected to a high
temperature .
CZ18 6,10,2 Technical No droplets occur during dry heat Delete this subclause and Agreed
test. renumber the others.
PL13 6,3 Editorial Add 6.3.1.2 with the text Agreed
(similar to 5.3.1.2).
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National Clause/ Paragraph Type of comment COMMENTS Proposed change OBSERVATIONS OF THE SECRETARIAT
Committee Subclause Figure/Table (General/ on each comment submitted
Technical/Editorial)
PL17 6,3 New Editorial Requirements concerning absolute Add the relevant Agreed
subclause humidity are omitted (see 5.3.4 and requirements concerning
IEC 60068-2-2, 14.3). absolute humidity.
CZ15 6,4 Technical There is missing a tolerance of The severities, as indicated Part agreed – see CZ10
severity temperature. by temperature and
duration of exposure, shall
be prescribed by the
relevant specification and
the temperature shall be
within ±3 K.
IT3 6,4 Technical In our opinion the sentences in the Delete item b and c Not agreed – see IT2
items b and c will lead to a too wide
number of choices.
PL16 6,3,3 Line 2 and Editorial The last sentence being Agreed
3 repetition of 6.3.1.1 should
be deleted.
CZ13 6,3,2,2 Editorial Text of first sentence is to be stated 6.3.2.2 The temperature of Agreed
more precisely. incident air delivered to the
test specimen shall be
within ± 3 K of test severity
temperature during the
steady state conditions.
CZ14 6,3,2,2 NOTE Technical Note relates to cold test (IEC 60068- Reword or delete the note. Agreed
2-1, see 104/316/CD)
PL14 6,3,2,2 Technical The text should be replaced Not agreed – however the tolerance shall
with the text as in 9.3.2.1.
be restored to ± 2 K
PL15 6,3,2,2 Note Technical Delete the Note - not Not agreed – however the note will be
applicable here. reworded
PL19 6,8 Title Editorial For conformity with Figure 1 and to „Steady state conditioning Not agreed see PL10
show that it is an integral part of the period”
conditioning, the title should be
changed to read:
st
CZ16 6,8,1 1 para Editorial “High temperature” should be instead The specimen shall then be Agreed
of “low temperature”. exposed to the high
temperature conditions .
PL18 6,7,3 Para 2 Editorial Amend this sentence to read: „If required by the relevant Agreed
specification, for steady
state conditioning period
the specimen.”
st rd
CZ17 6,8,3 1 and 3 Editorial Temperature is high in dry heat test At the end of this period, Agreed
paragraphs and it shall be declined after it, not the specimen shall remain
raised. in the chamber and the
temperature shall be
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Committee Subclause Figure/Table (General/ on each comment submitted
Technical/Editorial)
gradually declined to a
value lying within the limits
of standard atmospheric
conditions for testing.
At the end of this period, .
in accordance with clause
6.10. in the chamber .
before the temperature is
declined.
SP3 6,8,3 § 1 General The term “raised to” is wrong .lowered to. Agreed
7,10,2 § 1 Technical
8,10,2 § 1
9,10,1 § 1
9,10,2 § 1
PL20 6,8,3 Para 1, Editorial Replace „gradually raised” Agreed
line 2 by „gradually lowered”.
st
CZ19 7,2 1 para Technical As it is a test with sudden change of In this test, the specimen Test withdrawn
temperature, it is necessary to reword while being at the ambient
st
text of 1 paragraph according to test temperature of the
Ba. laboratory is introduced
into the chamber, the latter
being at the temperature
appropriate to the degree
of severity as specified in
the relevant specification. If
necessary, a test is
performed to determine if
the test facility fulfils the
requirements of a low air
velocity chamber or not.
(Delete third sentence.)
CZ23 7,10,1 Editorial Temperature is to be declined after In case the specimen . Test withdrawn
dry heat test, not raised. before the temperature is
declined.
PL22 7,2 Para 1, Technical Change the end of first sentence to „.at temperature Test withdrawn
line 2 read: appropriate to the severity
as specified in the relevant
specification.”
nd
CZ25 7,11,1 2 Technical No droplets occur during dry heat Delete second sentence. Test withdrawn
sentence test.
Temperature is to be declined after
CZ24 7,10,2 Editorial At the end of this period, . Test withdrawn
dry heat test, not raised. temperature shall be
gradually declined to .
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National Clause/ Paragraph Type of comment COMMENTS Proposed change OBSERVATIONS OF THE SECRETARIAT
Committee Subclause Figure/Table (General/ on each comment submitted
Technical/Editorial)
CZ22 7,4 Technical Tolerance of severities relates to The severities, ., shall be Test withdrawn
temperature only and it should be prescribed by the relevant
expressed more precisely. specification and the
temperature shall be within
±
3 K.
IT4 7,4 Technical In our opinion the sentences in the Delete item b and c Test withdrawn
items b and c will lead to a too wide
number of choices.
PL27 7,4 Para 1, Technical „. and be within 3 K” - it will be Delete “and be within 3 K”, Test withdrawn
line 2 covered 7.3.2.2 (as proposed).
CZ20 7,3,2,1 Editorial Second paragraph should be denoted 7.3.2.2 The temperature of Test withdrawn
as 7.3.2.2. incident air delivered to the
Text of first sentence is to be stated test specimen shall be
more precisely.
within ± 3 K of test severity
It is necessary to supplement a temperature during the
reference to end of second sentence. steady state conditions.
It is necessary to delete denotation of
The chamber air
subclause 7.3.2.2 on page 26. temperature shall be
measured in accordance
with clause 4.4.
Delete denotation of
subclause 7.3.2.2 on page
26.
PL23 7,3,2,1 Para 2 Technical The text of this paragraph Test withdrawn
should be replaced by the
text given in 9.3.2.1 and
moved to 7.3.2.2.
CZ21 7,3,2,2 NOTE Technical Note relates to cold test (IEC 60068- Reword or delete the note. Test withdrawn
2-1, see 104/316/CD)
PL24 7,3,2,2 Note Technical The Note is not necessary Test withdrawn
and should be deleted.
PL25 7,3,4 Lines 4 and Editorial The last sentence should Test withdrawn
5 be deleted.
PL26 7,3,6 Technical The text of 36.2.2 of Test withdrawn
IEC 60068-2-2 should be
added.
CZ27 8,10,1 Editorial Temperature is to be declined after In case the specimen . Agreed
dry heat test, not raised. before the temperature is
declined.
nd
CZ29 8,11,1 2 sent. Technical No droplets occur during dry heat Delete second sentence. Agreed
test.
CZ28 8,10,2 Editorial Temperature is to be declined after At the end of this period, . Agreed
dry heat test, not raised. temperature shall be
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National Clause/ Paragraph Type of comment COMMENTS Proposed change OBSERVATIONS OF THE SECRETARIAT
Committee Subclause Figure/Table (General/ on each comment submitted
Technical/Editorial)
gradually declined to .
CZ26 8,4 Technical Tolerance of severities relates to The severities, ., shall be See CZ10
temperature only and it should be prescribed by the relevant
expressed more precisely. specification and the
temperature shall be within
±3 K.
IT5 8,4 Technical In our opinion the sentences in the Delete item b and c Not agreed – see IT2
items b and c will lead to a too wide
number of choices.
CZ34 9,15 Figures Editorial Illustrative figures in subclause 9.15 Move illustration figures Agreed
pertain to subclause 9.7.2.2. given in subclause 9.15 to
Text above the figures should be subclause 9.7.2.2.
denoted as item j). Denote text above the
figures as item j).
CZ35 9,16 Editorial This information is presented here in Unify formal presentation of Agreed
table form but in other tests not. this information in whole
standard.
Temperature is to be declined after
CZ31 9,10,1 Editorial In case the specimen . Agreed
dry heat test, not raised. before the temperature is
declined.
nd
CZ33 9,11,1 2 sent Technical No droplets occur during dry heat Delete second sentence. Agreed
test.
CZ32 9,10,2 Editorial Temperature is to be declined after At the end of this period, . Agreed
dry heat test, not raised. temperature shall be
gradually declined to .
CZ30 9,4 Technical Tolerance of severities relates to The severities, ., shall be Agreed
temperature only and it should be prescribed in the relevant
expressed more precisely. specification and the
Tolerance ±3 K is defined in this temperature shall be within
subclause but, in subclause 9.3.2.1, it ±3 K.
is specified that chamber shall be We recommend to justify or
capable maintain the specified explain the difference of
temperature within ±2 K. temperature tolerances
according to subclauses
9.3.2.1 and 9.4.
IT6 9,4 Technical In our opinion the sentences in the Delete item b and c Not agreed – see IT2
items b and c will lead to a too wide
number of choices.
US9 5,12, Technical These clauses contain the same 1. Consolidate and Agreed
6,12, content. For ease of understanding, Renumber as the last of the
7,15, the clause titled " Information to be Normative Clauses, "
8,15, 9,15 given in the relevant specification" Information to be given in
should be set apart from the Test the relevant specification"
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National Clause/ Paragraph Type of comment COMMENTS Proposed change OBSERVATIONS OF THE SECRETARIAT
Committee Subclause Figure/Table (General/ on each comment submitted
Technical/Editorial)
Procedure.
PL21 7 and 8 General According to the titles these clauses 7.1 and 8.1 - in second Not agreed - Test BC is for specimens not
concern the tests, in which the lines, change „for use” to powered during the conditioning period.
specimen are not powered during the „survive” and modify the The specimen is powered in the steady
steady state conditioning periods. texts accordingly. state part of the test
However, this principle is not
reflected in the texts of 7.1 and 8.1.
PL28 8 and 9 General Clauses 8 and 9 should be See PL 21
corrected accordingly.
US7 7,10, Editorial The Test Procedure for heat- Consolidate the multiple
7,12, dissipating specimens (tests Bc, Bd, copies of these identical
7,13, Be) have these identical clauses clauses and refer to them.
8,10, added to those for NON-heat-
8,12, dissipating specimens: Final
8,13, Temperature Ramp, Test conditions
9,10, applicable when more than one
9,12, specimen is tested in the chamber
9,13, and Specimen with artificial cooling

FI4 5,13,  All information about the test Identify the used test Not agreed – but details may be by
6,13, 7,16 apparatus is not reasonable to give in appature by mark and reference to the register.
and 8,16 test report (items 9, 10, 12), because number
that information is normally specified
in the register of test apparatures of
the test laboratory.
US8 5,13, Technical These clauses contain the same 1. Consolidate and Move Agreed – standard will be reformatted.
6,13, content. Information to be given in the these clauses to
7,16, test report should be INFORMATIVE, Informative Annex A,
8,16, 9,16 not NORMATIVE. Practices and "Information to be given in
needs vary from laboratory to the test report"
laboratory; some customers require 2. Change "As a minimum
other or additional information. the test report shall show
the following information:"
to "Consider the following
elements to be included in
the environmental test
report:"
3. Change individual test
designator to "Ba, Bb, Bc,
Bd, or Be"
US10 5,4, 6,4, Technical These clauses contain the same Consolidate Agreed – standard will be reformatted.
7,4, 8,4, content. 1. Add the temperature
9,4 Incorporate the temperatures noted in from 394/INF:
394/INF. +25
12

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Committee Subclause Figure/Table (General/ on each comment submitted
Technical/Editorial)
Incorporate temperatures found on 2. Add the temperature
current product data sheets. found on current product
Incorporate temperatures found in data sheets:
current reliability life testing 75 ºC
Where do the temperatures of 630 2. Add the temperature
and 315 ºC originate and do they used in component
apply to electrotechnical products? reliability evaluation:
150 ºC
US11 5,4, 6,4, Technical These clauses contain the same Consolidate Agreed – standard will be
...