1、BRITISH STANDARD Environmental testing Part 3-5: Supporting doc mentation 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 BS EN ZEC 60068-3-5 12002 60068-3-5 12001 NO COPYING WITHOUT
2、 BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BS EN 60068-3-512002 Amd. No. National foreword Date Comments 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 a
3、nd Strategy Committee on 5 March 2002 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 UKparticipation in its preparation was entrusted to Technical Committee GELA04, Environmental conditions, classification and testing
4、, which has the responsibility to: - - 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 European developments and promulgate them in
5、the UK. - 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 period oftime during the change over fr
6、om one numbering system to the other, publications may contain identifiers from both systems. Cr oss-r e fer enc e s The British Standards which implement these international or European publications may be found in the BSI Standards Catalogue under the section entitled “International Standards Corr
7、espondence 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 with a British Standard does n
8、ot of itself confer immunity from legal obligations. 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、O BSI 5 March 2002 ISBN O 580 39049 7 EUROPEAN STANDARD EN 60068-3-5 NORME EUROPENNE EUROPISCHE NORM Januaw 2002 ICs 19.040; 29.020 English version Environmental testing Part 3-5: Supporting documentation and guidance - Confirmation of the performance of temperature chambers (IEC 60068-3-512001) Ess
10、ais denviron nement Partie 3-5: Documentation daccompagnement et guide - Confirmation des performances des chambres dessai en temprature (CE1 60068-3-512001) Umweltprfungen Teil 3-5: Untersttzende Dokumentation und Leitfaden - Besttigung des Leistungvermgens von Tem perat u rprf ka m mern (I EC 6006
11、8-3-512001) This European Standard was approved by CENELEC on 2001-12-04. CENELEC members are bound to comply with the CENKENELEC 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 bibli
12、ographical 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 responsibilit
13、y 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 eledrotechnical committees of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxem
14、bourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 10
15、50 Brussels O 2002 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 60068-3-52002 E Page 2 EN 60068-3-52002 Foreword The text of document 104/209/FDIS, future edition 1 of IEC 60068-3-5, prepared by IEC TC 104, Environmental condit
16、ions, 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 standard o
17、r by endorsement - latest date by which the national standards conflicting with the EN have to be withdrawn (dop) 2002-09-01 (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 standard.
18、In this standard, annex ZA is normative Annex ZA has been added by CENELEC. Endorsement not i ce The text of the International Standard IEC 60068-3-5:2001 was approved by CENELEC as a European Standard without any modification. O BSI 5 March 2002 Page 3 EN 60068-3-52002 CONTENTS INTRODUCTION 4 Scope
19、 5 Normative references . 5 Definitions 5 Measuring chamber performances 4.1 Test area environment 4.2 Temperature measure 4.3 Temperature chamber test load 4.4 Installation of tempera 4.5 Determination of temperature perf Standard tem peratu re sequence Evaluation criteria . 11 Information to be gi
20、ven 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 I . 9 Figure 4 - Location of minimal additional air temperature sensors for temperature chambers ov
21、er 2000 I . 9 Figure 5 - Temperature rate of change for heating and cooling of a test chamber 1 O Annex ZA (normative) Normative references to international publications with their corresponding European Publications 12 O BSI 5 March 2002 Page 4 EN 60068-3-52002 INTRODUCTION IEC 60068 contains funda
22、mental information on environmental testing procedures and severities. T h e ex press i o n “envi ro n m e n t a I con d it i on i n g “ or “e n v i ro n m e n t a I test i n g “ covers t h e n at u r a I a n d artificial environments to which components or equipment may be exposed so that an assess
23、ment 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 method of maintaining and measuring
24、temperature and/or humidity has a great influence on test results. The physical characteristics of temperature chambers can also influence test results. O BSI 5 March 2002 Page 5 EN 60068-3-52002 ENVIRONMENTAL TESTING - Part 3-5: Supporting documentation and guidance - Confirmation of the performanc
25、e 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. This standard is intended for users wh
26、en 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 edition of the referenced document (includi
27、ng any amendments) applies. IEC 60068-1, Environmenfal fesfing - Parf 1: General and guidance IEC 60068-2 (all parts), Environmenfal fesfing - Parf 2: Tesfs IEC 60068-3-6, Environmenfal fesfing - Parf 3-6: Supporfing documenfafion and guidance - Confirmafion of fhe performance of femperafurelhumidif
28、y chambers IEC 60068-3-7, Environmenfal fesfing - Parf 3-7: Supporfing documenfafion and guidance - Measuremenfs in femperafure chambers for fesf A and fesf B (wifh load) IEC 60584-1, Thermocouples - Parf 1: Reference fables I EC 60751 , Indusfrial plafinum resisfance fhermomefer sensors IS0 1 O01 2
29、-1, Qualify assurance requiremenfs for measuring equipmenf - Parf 1: Mefrological confirmafion sysfem for measuring equipmenf IS0 10012-2, Qualify assurance for measuring equipmenf - Parf 2: Guidelines for confrol of measuremenf processes 3 Definitions For the purpose of this part of IEC 60068, the
30、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 O BSI 5 March 2002 Page 6 EN 60068-3-52002 3.2 temperature setpoint desired temperature as set by the chamber controls 3.3 achieve
31、d 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 temperature fluctuation difference,
32、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 IEC 1545l01 Figure I -Working space O BSI
33、5 March 2002 Page 7 EN 60068-3-52002 Size Volume Distance X X(m i n . ) I mm mm I Small I up to 1 O00 I L/1 o I 50 I Medium Large 1 O00 to 2 O00 L/1 o 1 O0 More than 2 O00 L/1 o 150 I NOTE Not all chambers are cubic in construction. I 3.7 temperature gradient maximum difference in mean value, after
34、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 of the working space 3.9 temperature variation in space difference in mean va
35、lue, 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) Temperature fluctuation in the centre of working space (see 3.6) Temperature fl
36、uctuation outside the centre of working space (see 3.5) $ al v) v Time Figure 2 - Example of temperature differences IEC 7546/07 3.10 temperature extremes maximum and minimum measured temperatures achieved in the working space after stabilization O BSI 5 March 2002 Page 8 EN 60068-3-52002 4 Measurin
37、g 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 performance of temperature chambers should be carried out under st a nd ard atm os p heric co nd it ions. The following items s
38、hould 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 chamber should not be exposed to electromagnetic interference; - the chamber should be levelled; - the chamber s
39、hould 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 taken into consideration. Abnormal conditions should be recorded. 4.2 Temperature measurement system The uncerta
40、inty of measurement of the output of the measurement system should be determined by calibration of the system, traceable to international standards (see IS0 10012-1 and IS0 10012-2). Normally sensors should be either the resistance type (in accordance with IEC 60751) or the thermocouple type (in acc
41、ordance 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 from -200 “C to +200 “C the sensor measurement uncertainty should be in accordance with class A of IEC 60751
42、. 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 measuring with test load (with or without heat dissipation) see IEC 60068-3-7. 4.4 Installation of temperatu
43、re 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 O00 I, additional sensors should be located in front of the centre of each wall (see figure 4, minimum 15 sensors). The measur
44、ing 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. O BSI 5 March 2002 Page 9 EN 60068-3-52002 fl P I I .OTT IEC 7547/07 Figure 3 - Location of air temperature sensors f
45、or temperature chambers up to 2000 I Figure 4 - Location of minimal additional air temperature sensors for temperature chambers over 2000 I For confirmation monitoring, data should be recorded at least once a minute. The device used for recording data from the chamber monitoring sensors should be in
46、dependent of the chamber control system. 4.5 Determination of temperature performance 4.5.1 Achieved temperature, temperature fluctuation, temperature variation in space, temperature gradient The output of the temperature measuring system (see figure 3 or figure 4) determine, after chamber stabiliza
47、tion, the achieved temperature, temperature fluctuation and temperature gradient of the working space. Uncertainty of measurement of the temperature measuring system should be taken into account and the allowable tolerance reduced by the magnitude of the uncertainty. O BSI 5 March 2002 Page 10 EN 60
48、068-3-52002 - 4.5.2 Temperature rate of change To determine temperature rate of change: - adjust chamber to lowest specified temperature and allow to stabilize; - adjust chamber to highest specified temperature, monitoring the time between the 10 % and the 90 % points of the temperature range; - all
49、ow 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 rates of change for heating and cooling in K/min. 100 % 90 % 10 % O %- Time r IEC 7549/07 Figure 5 - Temperature rate of change for heating and cooling of a test chamber 5 Standard temperature sequence The following test sequence is considered to be the minimum recommended to obtain the necessary data for confirmation of the performance of a temperat
