IEC 60068-2-2:2007

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

IEC 60068-2-2:2007 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 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. 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.

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

IEC 60068-2-2:2007 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.

General Information

• Status: Published
• Publication Date: 15-Jul-2007
• 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: PPUB - Publication issued
• Start Date: 15-Sep-2007
• Completion Date: 16-Jul-2007

Standards Content (Sample)

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

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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
– 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

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

– 4 – 60068-2-2 © IEC:2007
INTERNATIONAL ELECTROTECHNICAL COMMISSION
______________
ENVIRONMENTAL TESTING –
Part 2-2: Tests – Test B: Dry heat

FOREWORD
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International Standard IEC 60068-2-2 has been prepared by IEC technical committee 104:
Environmental conditions, classification and methods of test
...