1、BRITISH STANDARD BS EN 60068-3-6:2002 IEC 60068-3-6:2001 Environmental testing Part 3-6: Supporting documentation and guidance Confirmation of the performance of temperature/humidity chambers The European Standard EN 60068-3-6:2002 has the status of a British Standard ICS 19.040; 19.080 NO COPYING W
2、ITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBS EN 60068-3-6:2002 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 13 March 20
3、02 BSI 13 March 2002 ISBN 0 580 39062 4 National foreword This British Standard is the official English language version of EN 60068-3-6:2002. It is identical with IEC 60068-3-6:2001. The UK participation in its preparation was entrusted to Technical Committee GEL/104, Environmental Conditions, Clas
4、sification 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 27-1 has been renumbered as IEC 60027
5、-1. For a period 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 international or European publications referred to in this document may be found in the BSI Standards
6、 Catalogue under the section entitled “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 t
7、heir correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK inte
8、rests informed; monitor related international and 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 11 and a back cover. The BSI copyright date displayed in this document indicates when th
9、e document was last issued. Amendments issued since publication Amd. No. Date CommentsEUROPEAN STANDARD EN 60068-3-6 NORME EUROPENNE EUROPISCHE NORM January 2002 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Ele
10、ktrotechnische Normung Central 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 60068-3-6:2002 E ICS 19.040; 29.020 English version Environmental testing Part 3-6: Supporting
11、documentation and guidance Confirmation of the performance of temperature/humidity chambers (IEC 60068-3-6:2001) Essais denvironnement Partie 3-6: Documentation daccompagnement et guide Confirmation des performances des chambres dessais en temprature et humidit (CEI 60068-3-6:2001) Umweltprfungen Te
12、il 3-6: Untersttzende Dokumentation und Leitfaden Besttigung des Leistungvermgens von Temperatur-/Klimaprfkammern (IEC 60068-3-6:2001) 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 condi
13、tions for giving this European Standard the status of 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 th
14、ree official versions (English, French, German). A version 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 electrotechni
15、cal committees of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.EN 60068-3-6:2002 - 2 - Foreword The text of document 104/210/FDIS, future edition 1
16、 of IEC 60068-3-6, prepared by IEC TC 104, Environmental conditions, classification and methods of test, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 60068-3-6 on 2001-12-04. The following dates were fixed: latest date by which the EN has to be implemented at nati
17、onal level by publication of an identical national standard 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 60068-3-5 and EN 60068-3-7. Annexes de
18、signated “normative“ are part of the body of the standard. In this standard, annex ZA is normative. Annex ZA has been added by CENELEC. _ Endorsement notice The text of the International Standard IEC 60068-3-6:2001 was approved by CENELEC as a European Standard without any modification. _ 11egaP EN6
19、006836:2001 13March2002 Page2 EN6006836:2001 13March2002 2egaP EN6006836:2001 13March2002 Page2 EN6006836:200260068-3-6 IEC:2001 3 CONTENTS INTRODUCTION 4 1 Scope 5 2 Normative references. 5 3 Definitions 6 4 Measuring of performances 7 4.1 Test area environment 7 4.2 Temperature measurement system
20、. 7 4.3 Humidity measurement system 7 4.4 Installation of sensors . 8 5 Determination of humidity performance 8 5.1 Temperature. 8 6 Standard humidity sequence 8 7 Evaluation criteria .10 8 Information to be given in the performance test report .10 Figure 1 Example of climatogram. 9 Table 1 Example
21、of test sequence . 9 Page12 1002:6386006NE 13March2002 3egaP 1002:6386006NE 13March2002 3egaP 2002:6386006NEPage3 EN6006836:200260068-3-6 IEC:2001 4 INTRODUCTION IEC 60068 contains fundamental information on environmental testing procedures and severities. The expression “environmental conditioning“
22、 or “environmental testing“ covers the natural and artificial environments to which components or equipment 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/humidity chambers use
23、d for “environmental conditioning“ or “environmental testing“ are not described in any publication, although the method of maintaining and measuring temperature and/or humidity has a great influence on test results. The physical characteristics of temperature/humidity chambers can also influence tes
24、t results. Page13 1002:6386006NE 13March2002 4egaP 1002:6386006NE 13March2002 4egaP 2002:6386006NEPage4 EN6006836:200260068-3-6 IEC:2001 5 ENVIRONMENTAL TESTING Part 3-6: Supporting documentation and guidance Confirmation of the performance of temperature/humidity chambers 1 Scope This part of IEC 6
25、0068 provides a uniform and reproducible method of confirming that temperature and humidity test chambers without load conform to the requirements, specified in climatic test procedures contained in IEC 60068-2 and is destined for users when conducting regular chamber performance monitoring. 2 Norma
26、tive 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 60068-3-4, Environmental test
27、ing Part 3-4: Supporting documentation and guidance Damp heat tests IEC 60068-3-5, Environmental testing Part 3-5: Supporting documentation and guidance Confirmation of the performance of temperature chambers IEC 60068-3-7, Environmental testing Part 3-7: Supporting documentation and guidance Measur
28、ements in temperature chambers for test A and test B (with load) IEC 60584-1, Thermocouples Part 1: Reference tables IEC 60751, Industrial platinum resistance, thermometer sensors ISO 10012-1, Quality assurance requirements for measuring equipment Part 1: Metrological confirmation system for measuri
29、ng equipment ISO 10012-2, Quality assurance for measuring equipment Part 2: Guidelines for control of measurement processes ISO 4677-1, Atmospheres for conditioning and testing Determination of relative humidity Part 1: Aspirated psychrometer method ISO (unnumbered), Guide to the Expression of Uncer
30、tainty in Measurement Page14 1002:6386006NE 13March2002 5egaP 1002:6386006NE 13March2002 5egaP 2002:6386006NEPage5 EN6006836:200260068-3-6 IEC:2001 6 3 Definitions For the purpose of this part of IEC 60068, the following definitions apply. For definitions regarding temperature testing, refer to IEC
31、60068-3-5. NOTE Unless otherwise specified humidity is relative humidity (RH). 3.1 temperature/humidity chamber enclosure or space in some parts of which the temperature/humidity conditions specified in IEC 60068-2 can be achieved 3.2 generation of humidity see clause 3 of IEC 60068-3-4 3.3 absolute
32、 humidity mass of water vapour present in a unit volume of moist air NOTE Typical units of measure are g/m 3 . 3.4 dewpoint, t d temperature at which the partial pressure of the water vapour in the air is equal to the saturation vapour pressure over water or ice 3.5 saturation vapour pressure when a
33、 given volume of air, at a constant temperature, has water present and is incapable of holding any more water it is said to be saturated 3.6 partial vapour pressure contribution of water vapour, in a given volume of air, at a constant temperature to the pressure exerted by the atmosphere 3.7 relativ
34、e humidity (RH) ratio of the partial vapour pressure, divided by the saturation vapour pressure of a given volume of air at a constant temperature, expressed as percentage NOTE The most popular method to express the water vapour content in air is relative humidity. 3.8 temperature/humidity stabiliza
35、tion temperature/humidity in the chamber can be considered stable when all points in the working space have reached and have maintained the setpoint temperature/humidity within a given tolerance 3.9 achieved humidity humidity in the chamber at any point within the working space after stabilization 3
36、.10 climatogram graphic display of combined temperature with relative humidity NOTE See figure 1. Page15 1002:6386006NE 13March2002 6egaP 1002:6386006NE 13March2002 6egaP 2002:6386006NEPage6 EN6006836:200260068-3-6 IEC:2001 7 3.11 relative humidity fluctuation fluctuation calculated with the tempera
37、ture sensor which has the largest fluctuation 3.12 relative humidity gradient gradient whose predominant contribution is caused by the temperature gradient in the working space NOTE The absolute humidity of the air can be considered to be the same throughout the working space. 4 Measuring of perform
38、ances When performing an assessment of a temperature/humidity chamber a humidity measuring system, which is independent of the chambers control system should be used. 4.1 Test area environment In accordance with IEC 60068-3-5. 4.2 Temperature measurement system The uncertainty of measurement of the
39、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). 4.3 Humidity measurement system The measurement system should have a calibration at the test conditions, traceable to international standards (s
40、ee ISO 10012-1 and ISO 10012-2) and the overall measurement uncertainty should be established using the guide to the expression of uncertainty in measurement. Some examples of humidity measurement systems include, but are not limited to, those listed below. 4.3.1 Wet and dry bulb method This method
41、(see ISO 4677-1) uses the cooling effect of water evaporation from a wet sock. The temperature of the sock is measured with a temperature sensor whilst simultaneously measuring the temperature of the air with a second temperature sensor. 4.3.2 Dewpoint mirror method This method cools the surface of
42、the mirror until condensation occurs on it. The temperature indicated is the dewpoint temperature. 4.3.3 Lithium chloride sensor This method gives absolute humidity values (dewpoint temperature). 4.3.4 Capacitive sensor Permeation of humidity changes the dielectric properties of certain materials an
43、d this is used for direct measurement of relative humidity. Page16 1002:6386006NE 13March2002 7egaP 1002:6386006NE 13March2002 7egaP 2002:6386006NEPage7 EN6006836:200260068-3-6 IEC:2001 8 4.4 Installation of sensors 4.4.1 Temperature sensors Normally sensors should be either the resistance type (in
44、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 from 200 C to +200 C the sensor measurement uncer
45、tainty should be in accordance with class A of IEC 60751. 4.4.2 Humidity sensor A single humidity sensor should be positioned at the centre of the working space. The relative humidity is then calculated at each point in the working space where a temperature sensor is located by using the temperature
46、 difference. This assumes that the absolute humidity remains the same throughout the working space. For confirmation monitoring, data should be recorded at least once a minute. The device utilised for recording data from the chamber monitoring sensors should be independent of the chamber control sys
47、tem. Sensor measurement uncertainty should not exceed 3 % RH. 5 Determination of humidity performance 5.1 Temperature If the chamber is also to be used for dry temperature testing it will be necessary to determine the temperature profile of the working space in accordance with IEC 60068-3-5 before d
48、etermining the humidity performance. 6 Standard humidity sequence The following test sequence is recommended to obtain the necessary data for confirming the range of operation of a temperature/humidity chamber. For chambers required to continuously test at set temperature/humidity conditions, a single value verification will suffice. Test area conditions should be in accordance with 4.1 of IEC 60068-3-5. An example of a test sequence is as follows: Page17 1002:6386006NE 13March2002 8egaP 1002:6386006NE 13March2002 8egaP 2002:6386006NEPage8 EN6006836:200260068-3-6 IEC:2001 9 Table 1 E
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