BS EN 60068-3-5-2002 Environmental testing - Guidance - Confirmation of the performance of temperature chambers《环境试验 指南 温度室性能的确定》.pdf

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1、BRITISH STANDARD BS EN 60068-3-5:2002 IEC 60068-3-5:2001 Environmental testing Part 3-5: Supporting documentation and guidance Confirmation of the performance of temperature chambers The European Standard EN 60068-3-5:2002 has the status of a British Standard ICS 19.040; 19.080 NO COPYING WITHOUT BS

2、I PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBS EN 60068-3-5:2002 This British Standard, having been prepared under the direction of the Electrotechnical Sector Policy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee on 5 March 2002 BSI 5 M

3、arch 2002 ISBN 0 580 39049 7 National foreword This British Standard is the official English language version of EN 60068-3-5:2002. It is identical with IEC 60068-3-5:2001. The UK participation in its preparation was entrusted to Technical Committee GEL/104, Environmental conditions, classification

4、and testing, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. From 1 January 1997, all IEC publications have the number 60000 added to the old number. For instance, IEC 27 has been renumbered as IEC 60027-1. For a per

5、iod of time during the change over from one numbering system to the other, publications may contain identifiers from both systems. Cross-references The British Standards which implement these international or European publications may be found in the BSI Standards Catalogue under the section entitle

6、d “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance

7、 with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and

8、European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 12, an inside back cover and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued.

9、Amendments issued since publication Amd. No. Date CommentsEUROPEAN STANDARD EN 60068-3-5 NORME EUROPENNE EUROPISCHE NORM January 2002 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Centr

10、al Secretariat: rue de Stassart 35, B - 1050 Brussels 2002 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 60068-3-5:2002 E ICS 19.040; 29.020 English version Environmental testing Part 3-5: Supporting documentation and guidance C

11、onfirmation of the performance of temperature chambers (IEC 60068-3-5:2001) Essais denvironnement Partie 3-5: Documentation daccompagnement et guide - Confirmation des performances des chambres dessai en temprature (CEI 60068-3-5:2001) Umweltprfungen Teil 3-5: Untersttzende Dokumentation und Leitfad

12、en Besttigung des Leistungvermgens von Temperaturprfkammern (IEC 60068-3-5:2001) This European Standard was approved by CENELEC on 2001-12-04. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of

13、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 ver

14、sion 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, Czech Republic, De

15、nmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.EN 60068-3-5:2002 - 2 - Foreword The text of document 104/209/FDIS, future edition 1 of IEC 60068-3-5, prepared by IEC TC 104, Environment

16、al conditions, classification and methods of test, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 60068-3-5 on 2001-12-04. The following dates were fixed: latest date by which the EN has to be implemented at national level by publication of an identical national sta

17、ndard or by endorsement (dop) 2002-09-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2004-12-01 This European Standard should be read in conjunction with EN 60068-3-6 and EN 60068-3-7. Annexes designated “normative“ are part of the body of the stand

18、ard. In this standard, annex ZA is normative Annex ZA has been added by CENELEC. _ Endorsement notice The text of the International Standard IEC 60068-3-5:2001 was approved by CENELEC as a European Standard without any modification. _ Page2 EN6006835:2002 BSI5March200260068-3-5 IEC:2001 3 CONTENTS I

19、NTRODUCTION 4 1 Scope 5 2 Normative references. 5 3 Definitions 5 4 Measuring chamber performances . 8 4.1 Test area environment 8 4.2 Temperature measurement system . 8 4.3 Temperature chamber test load. 8 4.4 Installation of temperature sensors 8 4.5 Determination of temperature performance . 9 5

20、Standard temperature sequence10 6 Evaluation criteria .11 7 Information to be given in the performance test report .11 Figure 1 Working space. 6 Figure 2 Example of temperature differences. 7 Figure 3 Location of air temperature sensors for temperature chambers up to 2000 l. 9 Figure 4 Location of m

21、inimal additional air temperature sensors for temperature chambers over 2000 l . 9 Figure 5 Temperature rate of change for heating and cooling of a test chamber 10 Annex ZA (normative) Normative references to international publications with their corresponding European Publications 12 Page3 EN600683

22、5:2002 BSI5March200260068-3-5 IEC:2001 4 INTRODUCTION IEC 60068 contains fundamental information on environmental testing procedures and severities. The expression “environmental conditioning“ or “environmental testing“ covers the natural and artificial environments to which components or equipment

23、may be exposed so that an assessment can be made of their performance under conditions of use, transport and storage to which they may be exposed in practice. Temperature chambers used for “environmental conditioning“ or “environmental testing“ are not described in any publication, although the meth

24、od of maintaining and measuring temperature and/or humidity has a great influence on test results. The physical characteristics of temperature chambers can also influence test results. Page4 EN6006835:2002 BSI5March200260068-3-5 IEC:2001 5 ENVIRONMENTAL TESTING Part 3-5: Supporting documentation and

25、 guidance Confirmation of the performance of temperature chambers 1 Scope This part of IEC 60068 provides a uniform and reproducible method of confirming that temperature test chambers, without load, conform to the requirements specified in climatic test procedures of IEC 60068-2 and other standards

26、. This standard is intended for users when conducting regular chamber performance monitoring. 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 edi

27、tion of the referenced document (including any amendments) applies. IEC 60068-1, Environmental testing Part 1: General and guidance IEC 60068-2 (all parts), Environmental testing Part 2: Tests IEC 60068-3-6, Environmental testing Part 3-6: Supporting documentation and guidance Confirmation of the pe

28、rformance of temperature/humidity chambers IEC 60068-3-7, Environmental testing Part 3-7: Supporting documentation and guidance Measurements in temperature chambers for test A and test B (with load) IEC 60584-1, Thermocouples Part 1: Reference tables IEC 60751, Industrial platinum resistance thermom

29、eter sensors ISO 10012-1, Quality assurance requirements for measuring equipment Part 1: Metrological confirmation system for measuring equipment ISO 10012-2, Quality assurance for measuring equipment Part 2: Guidelines for control of measurement processes 3 Definitions For the purpose of this part

30、of IEC 60068, the following definitions apply. 3.1 temperature test chamber enclosure or space in some parts of which the temperature conditions, specified in IEC 60068-2, can be achieved Page5 EN6006835:2002 BSI5March200260068-3-5 IEC:2001 6 3.2 temperature setpoint desired temperature as set by th

31、e chamber controls 3.3 achieved temperature temperature in the chamber at any point within the working space after stabilization 3.4 temperature stabilization temperature at which all points in the working space have reached and maintained the setpoint temperature within a given tolerance 3.5 temper

32、ature fluctuation difference, after stabilization, between the maximum and minimum temperatures at any point in the working space during a specified interval of time 3.6 working space part of the chamber in which the specified conditions can be maintained within the specified tolerances L 3 X 3 X 3

33、X 1 X 1 X 2 X 2 L 2 L 1 Figure 1 Working space IEC 1545/01 Page6 EN6006835:2002 BSI5March200260068-3-5 IEC:2001 7 Practical dimensions Size Volume l Distance X mm X(min.) mm Small Up to 1 000 L/10 50 Medium 1 000 to 2 000 L/10 100 Large More than 2 000 L/10 150 NOTE Not all chambers are cubic in con

34、struction. 3.7 temperature gradient maximum difference in mean value, after stabilization, at any moment in time between two separate points in the working space 3.8 temperature rate of change rate, in degrees per minute, for the transition between two specified temperatures measured at the centre o

35、f the working space 3.9 temperature variation in space difference in mean value, after stabilization, at any moment in time between the temperature at the centre of the working space and at any other point in the working space Temperature fluctuation outside the centre of working space (see 3.5) Tem

36、perature fluctuation in the centre of working space (see 3.6) Temperature fluctuation outside the centre of working space (see 3.5) Temperature Variation (see 3.9) Gradient (see 3.7) Time Figure 2 Example of temperature differences 3.10 temperature extremes maximum and minimum measured temperatures

37、achieved in the working space after stabilization IEC 1546/01 Page7 EN6006835:2002 BSI5March200260068-3-5 IEC:2001 8 4 Measuring chamber performances 4.1 Test area environment The environment around a temperature test chamber may influence the conditions inside the test chamber. The confirmation of

38、performance of temperature chambers should be carried out under standard atmospheric conditions. The following items should be taken into consideration: the ambient conditions described in IEC 60068-1 should be satisfied in principle; the chamber should not be exposed to direct solar radiation; the

39、chamber should not be exposed to electromagnetic interference; the chamber should be levelled; the chamber should be fixed in a location free from any mechanical and acoustic vibration interference. Manufacturers advice on electrical power requirements and the environmental conditions should be take

40、n into consideration. Abnormal conditions should be recorded. 4.2 Temperature measurement system The uncertainty of measurement of the output of the measurement system should be determined by calibration of the system, traceable to international standards (see ISO 10012-1 and ISO 10012-2). Normally

41、sensors should be either the resistance type (in accordance with IEC 60751) or the thermocouple type (in accordance with IEC 60584-1). The 50 % response time in air of the sensor shall be between 10 s and 40 s. The response time of the overall system should be less than 40 s. In a temperature range

42、from 200 C to +200 C the sensor measurement uncertainty should be in accordance with class A of IEC 60751. 4.3 Temperature chamber test load All measurements described below are performed with an empty working space. If it is not possible to empty the chamber totally this should be recorded. For mea

43、suring with test load (with or without heat dissipation) see IEC 60068-3-7. 4.4 Installation of temperature sensors Temperature measuring sensors are located in each corner and in the centre of the working space (see figure 3, minimum 9 sensors). For temperature chambers over 2 000 l, additional sen

44、sors should be located in front of the centre of each wall (see figure 4, minimum 15 sensors). The measuring system is to be arranged in such a way that the temperature distribution of the empty test chamber will not be affected. Recording of the achieved temperature should be effected. Page8 EN6006

45、835:2002 BSI5March200260068-3-5 IEC:2001 9 X 3 X 1 X 2 Figure 3 Location of air temperature sensors for temperature chambers up to 2000 l X 1 X 2 X 3 Figure 4 Location of minimal additional air temperature sensors for temperature chambers over 2000 l For confirmation monitoring, data should be recor

46、ded at least once a minute. The device used for recording data from the chamber monitoring sensors should be independent of the chamber control system. 4.5 Determination of temperature performance 4.5.1 Achieved temperature, temperature fluctuation, temperature variation in space, temperature gradie

47、nt The output of the temperature measuring system (see figure 3 or figure 4) determine, after chamber stabilization, the achieved temperature, temperature fluctuation and temperature gradient of the working space. Uncertainty of measurement of the temperature measuring system should be taken into ac

48、count and the allowable tolerance reduced by the magnitude of the uncertainty. IEC 1547/01 IEC 1548/01 Page9 EN6006835:2002 BSI5March200260068-3-5 IEC:2001 10 4.5.2 Temperature rate of change To determine temperature rate of change: adjust chamber to lowest specified temperature and allow to stabili

49、ze; adjust chamber to highest specified temperature, monitoring the time between the 10 % and the 90 % points of the temperature range; allow chamber to stabilize at the highest specified temperature; adjust chamber to lowest specified temperature, monitoring the time between the 90 % and 10 % points of temperature range. This will determine the temperature rat