欢迎来到麦多课文档分享! | 帮助中心 海量文档,免费浏览,给你所需,享你所想!
麦多课文档分享
全部分类
  • 标准规范>
  • 教学课件>
  • 考试资料>
  • 办公文档>
  • 学术论文>
  • 行业资料>
  • 易语言源码>
  • ImageVerifierCode 换一换
    首页 麦多课文档分享 > 资源分类 > PDF文档下载
    分享到微信 分享到微博 分享到QQ空间

    EN 60068-2-66-1994 en Environmental Testing Part 2 Test Methods Test Cx Damp Heat Steady State (Unsaturated Pressurized Vapour)《环境试验 第2部分 试验方法试验Cx 稳态湿热(不饱合加压蒸汽(IEC 68-2-66-1994)》.pdf

    • 资源ID:717502       资源大小:913.67KB        全文页数:22页
    • 资源格式: PDF        下载积分:10000积分
    快捷下载 游客一键下载
    账号登录下载
    微信登录下载
    二维码
    微信扫一扫登录
    下载资源需要10000积分(如需开发票,请勿充值!)
    邮箱/手机:
    温馨提示:
    如需开发票,请勿充值!快捷下载时,用户名和密码都是您填写的邮箱或者手机号,方便查询和重复下载(系统自动生成)。
    如需开发票,请勿充值!如填写123,账号就是123,密码也是123。
    支付方式: 支付宝扫码支付    微信扫码支付   
    验证码:   换一换

    加入VIP,交流精品资源
     
    账号:
    密码:
    验证码:   换一换
      忘记密码?
        
    友情提示
    2、PDF文件下载后,可能会被浏览器默认打开,此种情况可以点击浏览器菜单,保存网页到桌面,就可以正常下载了。
    3、本站不支持迅雷下载,请使用电脑自带的IE浏览器,或者360浏览器、谷歌浏览器下载即可。
    4、本站资源下载后的文档和图纸-无水印,预览文档经过压缩,下载后原文更清晰。
    5、试题试卷类文档,如果标题没有明确说明有答案则都视为没有答案,请知晓。

    EN 60068-2-66-1994 en Environmental Testing Part 2 Test Methods Test Cx Damp Heat Steady State (Unsaturated Pressurized Vapour)《环境试验 第2部分 试验方法试验Cx 稳态湿热(不饱合加压蒸汽(IEC 68-2-66-1994)》.pdf

    1、CENELEC EN*bOOb8-2- bb 94 3404583 0152851 639 W BRITISH STANDARD Environmental testing Part 2. Test methods Test Cx. Damp heat, steady state (unsaturated pressurized vapour) The European Standard EN 60068-2-66 : 1994 has the status of a British Standard This Part should be read in conjunction with B

    2、S 2011 : Part 1.1 General and guidance BS EN 1995 1994 60068-2-66 : IEC 68-2-66 : CENELEC ENmbOOb8-2- bb 94 = 3404583 0152852 575 BS EN 60068-2-66 : 1995 under the authority of the Standards Board and comes into Amd. No. Date effect on 15 April 1995 O BSI 1995 The following BSI references relate to

    3、the work on this standard: Committee reference GEL50/2 Draft for comment 91/03310 DC ISBN O 680 23681 6 Committees responsible %xt affected The preparation of this British Standard was entrusted by Technical Committee GEL/50, Environmental testing of electrotechnical products, to Subcommittee GEL/50

    4、/2, Climatic tests upon which the following bodies were represented : Federation of the Electronics Industry GAMBICA (BEAMA Ltd.) Ministry of Defence Society of Environmental Engineers Society of Motor Manufacturers and Traders Limited The following bodies were also represented in the drafting of th

    5、e standard, through subcommittees and panels: Biodeterioration Society Institute of Metals National Supervising Inspectorate (BSI-QA) CENELEC EN*bOOb-2- bb 94 3404583 0152853 401 BS EN 60068-2-66 : 1995 Contents page Committees responsible Inside front cover National foreword ii Foreword 2 Ext of EN

    6、 60068-2-66 3 i CENELEC ENMb0068-2- bb 94 3404583 0352854 348 BS EN 6068-2-66 : 1995 National foreword This British Standard has been prepared by Subcommittee GEL502 and is the English language version of EN 60068-2-66 : 1994 Environmental testiw Part 2: lbst methods %t Cx: Damp heat, steady state (

    7、unsaturated prmrixed vapour), published by the European Committee for Electrotechnical Standardization (CENELEC). It is identical with IEC 68-2-66 : 1994 published by the International Electrotechnical Commission (IEC). Compliance with a British Standard does not of itself confer immunity from legai

    8、 obligations. ii CENELEC EN*bOOb8-2- 66 94 3404583 0352855 284 W EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 60068-2-66 August 1994 ICs 19.040 Descriptors: Environmental testing, electricity, component, equipment, climatic test, damp heat, steady state, unsaturated pressurized vapour, proce

    9、dures, components specifications writing, equipment specifications writing English version Environmental testing Part 2: Test methods Test Cx: Damp heat, steady state (unsaturated pressurized vapour) (IEC 68-2-66 : 1994) Essais denvironnement Umweltprf ungen Partie 2: Mthodes dessai Essai Cx: Essai

    10、continu de chaleur humide (vapeur pressurise non sature) Teil 2: Prfverfahren Prfung Cx: Feuchte Wrme, konstant (ungesttigter Druckdampf) (CE1 68-2-66 : 1994) (IEC 68-2-66 : 1994) This European Standard was approved by CENELEC on 1994-07-05. CENELEC members are bound to comply with the CENKENELEC In

    11、ternal Regulations which stipulate the conditions 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

    12、 member. This European Standard exists in three 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. CE

    13、NELEC members are the national electrotechnical committees of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC European Committee for Electrotechnical Standardizatio

    14、n Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels O 1994 Copyright reserved to CENELEC members Ref. No. EN 60068-2-66 : 1994 E CENELEC EN*b0068-2- 66 94 3404583 0352856 II0 W Page 2 EN 60068-2-6

    15、6 : 1994 Foreword The text of document SOB(C0) 342, as prepared by Subcommittee 50B: Climatic tests, of IEC Technical Committee 50: Environmental testing, was submitted to the IEC-CENELEC parallel vote in February 1994. The reference document was approved by CENELEC as EN 60068-2-66 on 5 July 1994.

    16、The following dates were fixed: - latest date of publication of an identical national standard (dop) 1995-07-01 - latest date of withdrawal of conflicting national standards (dow) 1995-07-01 Annexes designated normative are part of the body of the standard. Annexes designated informative are given o

    17、niy for information. In this standard, annex A is normative and annexes B, C and D are informative. CONTENTS Page Clause 1 2 3 4 5 6 7 8 9 10 Scope . 4 General description . 4 Description of test apparatus . 4 Severities 5 Initial measurements . 6 Testing 6 Intermediate measurements . 7 Recovery . 7

    18、 Final measurements 8 Information to be given in the relevant specification 8 Annexes A Steam table 9 B Physical significance of the test 12 C Determination of humidity . 13 D Test apparatus and handling . 15 CENELEC EN*b00b8-2- 66 94 = 3404583 0152858 T3 m Page 4 EN 60068-2-66: 1994 ENVIRONMENTAL T

    19、ESTING - Part 2: Test methods - Test Cx: Damp heat, steady state (unsaturated pressurized vapour) 1 Scope This International Standard provides a standard test procedure for the purpose of evaluating, in an accelerated manner, the resistance of small electrotechnical products, primarily non- hermetic

    20、ally sealed components, to the deteriorative effect of damp .heat. The test is not intended to evaluate external effects, such as corrosion and deformation. 2 General description In this test, the specimen is subjected to very high levels of unsaturated damp heat for a relatively short period. Elect

    21、rical bias is usually applied. Due to the very accelerated nature of the test, careful consideration must be given to the choice of test conditions, since this may have an important effect on the type of failure mode which could occur (see annex B). The test provides three temperatures at a relative

    22、 humidity of 85 %. The test severity is defined by the duration at one of the temperatures. Care shall be taken not to reach the maximum rated temperature of the specimen andlor the critical temperature of any encapsulating materials. The glass transition temperature of a plastic is a typical exampl

    23、e of a critical transition temperature. In the case of plastic encapsulated components, degradation results from absorption of water-vapour by the plastic, and penetration of moisture along terminals. 3 Description of test apparatus 3.1 The test chamber The chamber shall be so constructed that: a) i

    24、t can produce the temperature and relative humidity given in table 1, and sustain the pressure values given in clause 4, note 3; b) it is capable of providing controlled conditions of temperature, relative humidity and pressure during testing, and the ramp-up to, and ramp-down from, specified test c

    25、onditions; c) the temperature and humidity of the chamber can be monitored by means of sens- ing devices located in the working space, and/or other areas giving the same results (e.g. a steam generator). NOTE - The direct measurement of relative humidity during this test is not possible with current

    26、 techniques. Guidance on the determination of the relative humidity in the working space is given in annex C. CENELEC EN*b0068-2- 66 94 m 340i1583 0152859 92“ m Temperature “Cl) 110 Page 5 EN 60068-2-66 : 1994 Relative humidity Duration (in hours)3) %*I 1 II III 85 96 192 408 d) the enclosed atmosph

    27、ere can be expelled from the chamber by the water-vapour prior to the commencement of testing; e) condensed water is not allowed to fall on the specimen; f) the materials used in the construction shall not cause any corrosion of the spe- cimen, or degradation of the quality of the humidifying water

    28、(see clause D.2). 130 The temperature tolerance of f2 OC is intended to take account of absolute errors in the measurement, fluctuations of the chamber temperature at any point, and variations between all points within the working space. 85 24 48 96 However, in order to maintain the relative humidit

    29、y within the specified tolerance of f5 Yo, it is necessary to keep the difference between any two points in the working space (at any instant) within narrower limits. The specified humidity tolerance will be exceeded if such temperature differences exceed 1,5 OC. It is also necessary to restrict the

    30、 short-term temperature fluctuations due to cycling of the chamber heater to a similar value. The specimen should notsignificantly impede the vapour flow. Condensation shall not be allowed to form on the specimen at any time during the test. 3.2 The humidifying water Distilled or deionised water sha

    31、ll be used. The water shall have a resistivity of not less than 0,5 MRcm at 23 OC. The pH value shall be between 6,O and 7.2 at 23 OC. Before the water is placed in the humidifier, all internal parts of the chamber shall be cleaned. Guidance on cleaning is given in clause D.4. 4 Severities One of th

    32、e combinations of temperature and duration shown in table 1 shall be used unless otherwise specified in the relevant specification. For each temperature, three durations are defined. Table 1 - Severity CENELEC ENab0068-2- bb 94 D 3404583 Ol1528b0 b4L = Page 6 EN 6068-2-66 : 1994 NOTES 1 It is not re

    33、commended that a test should be restarted; however, if. at a given temperature it is required to subject the specimen to a longer duration than that given in column 111 of table 1. then the test shall be recommenced in accordance with the requirements of clause 6. The test shall be recommenced withi

    34、n 96 h of the end of the ramp-down period of the previous test. During the interval between the tests, the specimen shall be held under standard atmospheric conditions for meacurement and tests, unless otherwise specified in the relevant specification. 2 the ramp-up and ramp-down period and the cham

    35、ber cleaning and preparation time. 3 130 “C respectively. The durations given for testing at the specified conditions do not include the additional time required for The vapour pressures are approximately 0.12 MPa, 0,17 MPa and 0,23 MPa at 1 10 OC, 120 OC and 5. Initial measurements The specimen sha

    36、ll be submitted to the visual, dimensional and functional checks pre- scribed by the relevant specification. 6 Testing 6.1 With the chamber and specimen at the laboratory conditions of temperature, pressure and humidity, the specimen shall be installed in the working space in the chamber. 6.2 Positi

    37、oning and mounting of the specimen The specimen shall not be subjected to radiant heat from the heaters or the chamber wall. If required by the relevant specification, a specific mounting structure shall be used. The heat conductivity and the thermal capacity of the mounting fixtures shall be low so

    38、 that for all practical purposes the specimen is thermally isolated. Care shall be exercised in the choice of mounting structure and mounting fixture materials to minimize the effects of contamination and to minimize degradation due to corrosion and other mechanisms (see clause D.2). 6.3 Bias voltag

    39、e If required by the relevant specification, the specimen shall have a bias voltage applied during exposure. Guidance on the application of bias is given in annex D. The bias voltage (or bias voltage cycle) shall be applied to the specimen when the temperature and the relative humidity have reached

    40、the stable state, and continue until the specimen is under recovery conditions. CENELEC ENrbOOb8-2- bb 7V W 3VOV583 01528bL 584 Page 7 EN 60068-2-66 : 1994 6.4 The test cycle 6.4.1 The temperature of the chamber shall be raised to the appropriate value. During this period the enclosed atmosphere is

    41、expelled from the chamber by the water-vapour, and the temperature and the relative humidity shall not exceed the specified value. Condensed water is not allowed on the specimen at any time during the test cycle. Stabilization of temperature and humidity shall take place within 1,5 h. However, if st

    42、abilization takes longer than 1.5 h, the test requirements will be met if stabilization is achieved in not more than 3 h and the specified test duration is greater than 48 h. 6.4.2 The temperature and relative humidity shall be maintained within the prescribed limits for a duration as specified in t

    43、he relevant specification. The test duration shall commence as soon as the conditions have stabilized. 6.4.3 At the end of the specified duration, the chamber pressure, temperature and relative humidity shall be restored to standard atmospheric conditions for measurement and tests in not less than 1

    44、 h and not more than 4 h. During this period, the temperature and the relative humidity shall not exceed the specified value. The conditions may be achieved by means of natural cooling. If the pressure is reduced by release from the chamber, care shall be taken that the specimen is not subject to ra

    45、pid depressurization. The pressure shall not fall below the laboratory pressure. The bias should normally be maintained during this period. 6.4.4 On completion of the cooling period, the specimen shall be subjected to the recovery procedure. 7 Intermedlate measurements The relevant specification may

    46、 require electrical and/or mechanical checks during testing. If it is required to make intermediate measurements, the relevant specification shall define the measurements and period(s) during testing after which they shall be carried out. The measurements shall not cause any change to the test condi

    47、tions. Measurements preceded by recovery which would require the removal of the specimen from the chamber are not permissible during testing. 8 Recovery Upon completion of testing, the specimen shall be allowed to recover for not less than 2 h and not more than 24 h at standard atmospheric condition

    48、s for measurement and tests. CENELEC EN*bOOb8-2- bb 94 m 3404583 Ol1528b2 414 Page 8 EN 60068-2-66 : 1994 9 Final measurements The specimen shall be submitted to the visual, dimensional, and functional checks prescribed by the relevant specification. 10 Information to be given in the relevant specif

    49、ication When this test is included in a relevant specification, the following details shall be given, in as far as they are applicable. The relevant specification shall supply the information as required in the clauses listed below, paying particular attention to the items marked with an asterisk (*), as this information is always required. Clause a) Test severity 4 6) initiai measurements 5 c) Specific mounting structures . 6 d) Bias voltage 6 e) Intermediate measurements . 7 f) Final measurements* 9 CENELEC EN*b0068-2- 66 9Y W 340Y583 0352863 350 W Page 9 EN 60


    注意事项

    本文(EN 60068-2-66-1994 en Environmental Testing Part 2 Test Methods Test Cx Damp Heat Steady State (Unsaturated Pressurized Vapour)《环境试验 第2部分 试验方法试验Cx 稳态湿热(不饱合加压蒸汽(IEC 68-2-66-1994)》.pdf)为本站会员(towelfact221)主动上传,麦多课文档分享仅提供信息存储空间,仅对用户上传内容的表现方式做保护处理,对上载内容本身不做任何修改或编辑。 若此文所含内容侵犯了您的版权或隐私,请立即通知麦多课文档分享(点击联系客服),我们立即给予删除!




    关于我们 - 网站声明 - 网站地图 - 资源地图 - 友情链接 - 网站客服 - 联系我们

    copyright@ 2008-2019 麦多课文库(www.mydoc123.com)网站版权所有
    备案/许可证编号:苏ICP备17064731号-1 

    收起
    展开