IEC 60068-3-1:2011

Environmental testing - Part 3-1: Supporting documentation and guidance - Cold and dry heat tests

IEC 60068-3-1:2011 provides guidance regarding the performance of cold and dry heat tests. This second edition cancels and replaces the first edition, published in 1974, and constitutes a technical revision. The main changes with regard to the previous edition are as follows:
- removal of guidance regarding thermal characteristics of chamber walls;
- revision of sections that address environmental chambers that do not use movement of air for temperature control.

Essais d'environnement - Partie 3-1: Documentation d'accompagnement et guide - Essais de froid et de chaleur sèche

La CEI 60068-3-1:2011 fournit des lignes directrices relatives aux performances des essais de froid et de chaleur sèche. Cette deuxième édition annule et remplace la première édition parue en 1974, dont elle constitue une révision technique. Les modifications principales par rapport à l'édition précédente sont les suivantes:
- retrait du guide concernant les caractéristiques thermiques des parois de la chambre;
- révision des sections traitant des chambres environnementales qui n'utilisent pas le mouvement de l'air pour le contrôle de la température.

General Information

• Status: Published
• Publication Date: 18-Aug-2011
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 19.040 - Environmental testing
• Technical Committee: TC 104 - Environmental conditions, classification and methods of test
• Drafting Committee: MT 16 - TC 104/MT 16
• Current Stage: DELPUB - Deleted Publication
• Start Date: 13-Aug-2021
• Completion Date: 29-Jun-2023

Relations

• Revised: IEC 60068-3-1:2023 - Environmental testing - Part 3-1: Supporting documentation and guidance - Cold and dry heat tests
• Effective Date: 05-Sep-2023

Standards Content (Sample)

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

Essais d’environnement –
Partie 3-1: Documentation d’accompagnement et guide – Essais de froid et de
chaleur sèche
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IEC 60068-3-1 ®
Edition 2.0 2011-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Environmental testing –
Part 3-1: Supporting documentation and guidance – Cold and dry heat tests

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

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

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

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

60068-3-1 © IEC:2011 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ENVIRONMENTAL TESTING –
Part 3-1: Supporting documentation and guidance –
Cold and dry heat tests
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
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9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60068-3-1 has been prepared by IEC technical committee 104:
Environmental conditions, classification and methods of test.
This second edition cancels and replaces the first edition, published in 1974, and constitutes
a technical revision.
The main changes with regard to the previous edition are as follows:
– removal of guidance regarding thermal characteristics of chamber walls;
– revision of sections that address environmental chambers that do not use movement of air
for temperature control.
– 4 – 60068-3-1 © IEC:2011
The text of this standard is based on the following documents:
FDIS Report on voting
104/555/FDIS 104/558/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts in the IEC 60068 series, under the general title Environmental testing can be
found on the IEC website.
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
60068-3-1 © IEC:2011 – 5 –
ENVIRONMENTAL TESTING –
Part 3-1: Supporting documentation and guidance –
Cold and dry heat tests
1 Scope
This part of IEC 60068 provides guidance regarding the performance of cold and dry heat
tests.
2 Normative references
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.
IEC 60068-1, Environmental testing – Part 1: General and guidance
IEC 60068-2-1, Environmental testing – Part 2-1: Tests – Test A: Cold
IEC 60068-2-2, Environmental testing – Part 2-2: Tests – Test B: Dry heat
3 Terms and definitions
For the purposes of this document, the following terms and definitions app
...