IEC INTERNATIONAL STANDARD 60068-2-1 Sixth edition 2007-03 Environmental testing - Part 2-1: Tests - Test A: Cold This English-language version is derived from the original bilingual publication by leaving out all French-language pages. Missing page numbers correspond to the French- languagepages. IEC Reference number IEC 60068-2-1:2007(E) IEC INTERNATIONAL STANDARD 60068-2-1 Sixth edition 2007-03 Environmental testing - Part 2-1: Tests - Test A: Cold IEC 2007 Copyright - all rights reserved 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 the publisher. Telephone: +41 22 919 02 11± Telefax: +41 22 919 03 00 E-mail: [email protected] Web: www.iec.ch N PRICE CODE IEC Commission Electrotechnique Internationale InternationalElectrotechnicalCommission MekAyHapoAHanSneKTpoTexHMyecKanKoMMCCMA For price, see current catalogue 60068-2-1IEC:2007 CONTENTS FOREWORD. INTRODUCTION. Scope and object. 13 2 Normative references .. .13 3 Terms and definitions .15 4 dissipating specimens .15 4.1 General. .15 4.2 Ascertaining high orlow air velocity in the test chamber... 4.3 Non heat-dissipating specimens. 4.4 Testing of heat-dissipating specimens... 4.5 Temperature monitoring ... 4.6 Packaging .... 4.7 Diagrammatic representations..... 17 Test description. 19 5 5.1 General 19 5.2 Test Ab: Cold for non heat-dissipating specimens with gradual change of temperature.. 19 5.2.1 Object. 5.2.2 General description. 21 5.3 Test Ad: Cold for heat-dissipating specimens with gradual change of temperature that are powered after initial temperature stabilization.... .21 5.3.1 Object .... .21 5.3.2 General description. 21 5.4 Test Ae:Cold for heat-dissipating specimens with gradual change of temperature that are required to be powered throughout the test.. ...21 5.4.1 Object .... .21 5.4.2 General description ... .21 5.4.3 Energizing the specimen . .23 6 Test procedure. .23 6.1 Confirmationof performance .23 6.2 Working space .23 6.3 Thermal radiation .23 6.4 Specimen with artificial cooling. 6.5 Mounting ... 6.6 Severities. 6.6.1 Temperature .25 6.6.2 Duration. .25 6.7 Preconditioning .25 6.8 Initial measurements .25 6.9 Conditioning 25 6.10 Intermediatemeasurements 27 6.11 Final temperatureramp 27 6.12 Recovery 27 6.13 Final measurements 27 - 5 - 60068-2-1IEC:2007 7 Information to be given in the relevant specification ... ...27 8 Information to be given in the test report ... ....29 Figure 1-Block diagram tests A: Cold ..19 60068-2-1IEC:2007 - 7 - INTERNATIONALELECTROTECHNICALCOMMISSION ENVIRONMENTALTESTING- Part 2-1: Tests - Test A: Cold FOREWORD 1) all national electrotechnical committees (IEC National Committees). .Theobjectof IECistopromote this end and in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports, Publicly Available Specifications (PAS)and Guides (hereafter referredtoas "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. .IECcollaboratesclosely agreementbetweenthe two organizations. The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international 2) 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. between any IEc Publication and the corresponding national or regional publication shall be clearly indicated in the latter