BS EN 61965-2003 Mechanical safety of cathode ray tubes《阴极射线管的机械安全》.pdf

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1、BRITISH STANDARD BS EN 61965:2003 Mechanical safety of cathode ray tubes The European Standard EN 61965:2003 has the status of a British Standard ICS 31.100 BS EN 61965:2003 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 28 November 2003 BSI

2、 28 November 2003 ISBN 0 580 42987 3 National foreword This British Standard is the official English language version of EN 61965:2003. It is identical with IEC 61965:2003. It supersedes BS EN 61965:2001 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee

3、 EPL/39, Electronic tubes, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in th

4、e BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible

5、for its 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 i

6、nterests 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 59 and a back cover. The BSI copyright notice displayed in this document indicates wh

7、en the document was last issued. Amendments issued since publication Amd. No. Date CommentsEUROPEAN STANDARD EN 61965 NORME EUROPENNE EUROPISCHE NORM October 2003 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr El

8、ektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2003 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 61965:2003 E ICS 31.100 Supersedes EN 61965:2001English version Mechanical safety of cathode r

9、ay tubes (IEC 61965:2003) Scurit mcanique des tubes cathodiques (CEI 61965:2003) Mechanische Sicherheit von Kathodenstrahlrhren (IEC 61965:2003) This European Standard was approved by CENELEC on 2003-10-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate

10、 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 member. This European Standard ex

11、ists 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. CENELEC members are the national ele

12、ctrotechnical committees of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Lithuania, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United Kingdom. EN 61965:2003 - 2 - Foreword The text of do

13、cument 39364/FDIS, future edition 2 of IEC 61965, prepared by IEC TC 39, Electronic tubes, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 61965 on 2003-10-01. This European Standard supersedes EN 61965:2001. The following dates were fixed: latest date by which the E

14、N has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2004-07-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2006-10-01 The main change with respect to EN 61965:2001 is the inclusion of th

15、e requirements for cathode ray tubes with film attached to the face plate. Annexes designated “normative“ are part of the body of the standard. Annexes designated “informative“ are given for information only. In this standard, annex ZA is normative and annexes A and B are informative. Annex ZA has b

16、een added by CENELEC. _ Endorsement notice The text of the International Standard IEC 61965:2003 approved by CENELEC as a European Standard without any modification. _ Page2 EN61965:2003 CONTENTS INTRODUCTION.6 1 Scope.7 2 Normative references.7 3 Definitions8 4 General requirements.9 4.1 Corrosion

17、protection9 4.2 Mechanical damage9 4.3 Handling9 4.4 Film-coated CRTs.9 5 Environmental conditioning.10 5.1 Standard atmospheric conditions for testing 10 5.2 Preconditioning .10 5.3 Thermal conditioning.10 6 Sampling10 6.1 Sampling plans10 6.2 Sample numbers.10 6.3 Compliance.10 7 Test preparation

18、and set-up10 7.1 Scratch patterns10 7.2 Barriers.11 7.3 Mounting.11 7.4 Mounting position11 8 Testing of large CRTs.11 8.1 Mechanical strength (ball impact test) .11 8.2 Implosion test (missile)12 8.3 Implosion test (thermal shock).13 8.4 High-energy impact test.13 9 Testing of small CRTs 14 9.1 Mec

19、hanical strength (ball impact test) .14 9.2 Implosion test (high ball) .15 9.3 Implosion test (thermal shock).15 9.4 High-energy impact test.15 10 Testing of prestressed banded CRTs with protective film16 10.1 General.16 10.2 Film scoring pattern for CRTs with protective film16 10.3 Peel test17 10.4

20、 Immersion test.17 11 Marking17 12 Application notes for pre-stressed banded CRTs with protective film 18 13 Normative requirements for the use of Tables 1 and 2 (prestressed banded CRTs) 18 13.1 Sampling plan I: New construction.18 13.2 Sampling plan II: New construction with known resin or tape.19

21、 13.3 Sampling plan III: Tension band and alternative tension band .19 13.4 Sampling plan IV: Alternative construction.20 Page3 EN61965:2003 14 Normative requirements for the use of Tables 3 and 4 (prestressed banded with protective film)21 14.1 Sampling plan I: New construction.21 14.2 Sampling pla

22、n II: New construction with known resin, tape, film or adhesive22 14.3 Sampling plan III: Alternative tension band22 14.4 Sampling plan IV: Alternative construction.23 15 Alternative thermal conditioning for use with Tables 3 and 4 (prestressed banded with protective film) 24 15.1 Additional peel fo

23、rce requirements where alternative thermal conditioning is to be performed.24 15.2 Tensile strength test where alternative thermal conditioning is to be performed24 16 Normative requirements for the use of Tables 6 and 7 (bonded frame CRTs) .25 16.1 Sampling plan I: New construction.25 16.2 Sampling

24、 plan II: Alternative construction26 17 Normative requirements for the use of Tables 8 and 9 (laminated CRTs)26 17.1 Sampling plan I: New construction.26 17.2 Sampling plan II: Alternative construction26 Annex A (informative) Background to the development of this standard 46 A.1 Mechanical strength

25、test47 A.2 Implosion test 47 A.3 Small CRTs (76 mm to 160 mm diagonal)47 A.4 Evaluation time47 Annex B (informative) Velocity and potential force of glass particles expelled from a CRT subjected to a ball impact Ballistic and statistical calculations48 B.1 Introduction.48 B.2 Analysis without fricti

26、on .48 B.3 Analysis with friction54 B.4 Potential threat57 B.5 Conclusions.57 Annex ZA (normative) Normative references to international publications with their corresponding European publications59 Figure 1 Example of a test cabinet.35 Figure 2 Example of a ball impact test .36 Figure 3 Example of

27、a 2,3 kg steel missile .37 Figure 4 Missile impact area on a typical CRT .38 Figure 5 Example of a missile impact test 39 Figure 6 Options for scratch patterns for implosions by the thermal shock method.40 Figure 7 Film scoring tool.41 Figure 8 Example of high-energy impact test set-up.42 Figure 9 S

28、teel pins used in high-energy impact test .43 Figure 10 Weights used in high-energy impact test .44 Figure 11 Example of 1,4 kg steel missile 45 Page4 EN61965:2003 Figure B.1 Height of the barriers and distances from the CRT face 48 Figure B.2 Example of the parabolic trajectory of a glass particle

29、and the definition of the distances 49 Figure B.3 Definition of the initial angle and initial velocity and the forces acting on a particle .50 Figure B.4 Initial velocity required to pass over barriers at x = l 1 (solid line) or x = l 2(dashed line) as a function of the initial angle 52 Figure B.5 T

30、rajectories for a glass particle for different initial angles and an initial velocity of 4 m/s 52 Figure B.6 Definition of the forces acting on a particle .54 Figure B.7 Measurements of a typical glass particle.55 Figure B.8 Trajectory of a glass particle with an initial velocity of 2 m/s and an ini

31、tial angle of 45 without friction (dashed line) and with friction (solid line).56 Figure B.9 Trajectories of a glass particle with an initial velocity of 2 m/s and an initial angle of 45 for different values of the cross-sectional area.57 Table 1 Sampling and test programme for prestressed banded CR

32、Ts exceeding 160 mm diagonal 27 Table 2 Sampling and test programme for prestressed banded CRTs from 76 mm to 160 mm diagonal 28 Table 3 Sampling and test programme for prestressed banded CRTs with protective film exceeding 160 mm diagonal.29 Table 4 Sampling and test programme for prestressed bande

33、d CRTs with protective film from 76 mm to 160 mm diagonal 30 Table 5 Sampling and test programme for adhesion of film used in CRTs with protective film (tested according to Tables 3 and 4) 31 Table 6 Sampling and test programme for bonded frame CRTs exceeding 160 mm diagonal32 Table 7 Sampling and t

34、est programme for bonded frame CRTs from 76 mm to 160 mm diagonal 32 Table 8 Sampling and test programme for laminated CRTs exceeding 160 mm diagonal33 Table 9 Sampling and test programme for laminated CRTs from 76 mm to 160 mm diagonal33 Table 10 CRT size and deflection angle ranges .34 Table B.1 V

35、alues of the distances49 Table B.2 Upper and lower boundary values of the initial angle51 Page5 EN61965:2003 INTRODUCTION This International Standard sets forth test methods and limits for cathode ray tubes (CRTs). Originally, the only IEC standard for the mechanical safety of CRTs had been containe

36、d within Clause 18 of the equipment standard IEC 60065. Whereas that standard had been accepted and used by many countries, many others were not able to implement its requirements because of differing local needs. IEC 61965 was therefore published in 2000 with the aim of providing the basis for wide

37、r acceptance and use and reflecting the current IEC policy of producing separate component standards to which equipment standards can refer. This 2nd edition covers the requirements for the CRTs with film attached to the faceplate as part of the safety implosion protection system. Many years of expe

38、rience had been built up in the use of both the IEC 60065 test and the other commonly used national alternatives. During the development of IEC 61965, extensive test programmes and ballistic and statistical calculations were carried out to verify that the requirements of the standard give protection

39、 for users of CRTs when the tubes are mounted in the equipment for which they are intended. This was also done to ensure that IEC 61965 maintains the stringent requirements of both IEC 60065 and the alternative tests in common use. These tests and calculations also confirmed a) the acceptability of

40、one standard ball for the mechanical strength test, and b) the need for the implosion test where it is not always possible to induce rapid devacuation using the ball impact test. As the impact tests in this standard are overstress tests, only the effect of rapid devacuation is evaluated and not subs

41、equent relaxation of mechanical stresses in the CRT from the implosion protection system. Page6 EN61965:2003 MECHANICAL SAFETY OF CATHODE RAY TUBES 1 Scope This International Standard is applicable to cathode ray tubes and cathode ray tube assemblies (hereinafter referred to as CRTs) which are inten

42、ded for use as components in apparatus and which have integral protection with respect to the effects of implosion. These requirements apply to CRTs intended for use in apparatus including electrical and electronic measuring and testing equipment, information technology equipment, medical equipment,

43、 telephone equipment, television equipment and other similar electronic apparatus. This standard is intended to apply only to those CRTs in which the face of the CRT forms part of the enclosure for the apparatus. The test methods do not apply to CRTs which are protected by separate safety screens. A

44、 CRT covered by this standard is intended to be installed in an enclosure designed both to protect the rear of the CRT against mechanical or other damage under normal conditions of operation and to protect the user against particles expelled in a backwards direction from the CRT face in the event of

45、 implosion. This standard contains requirements for CRTs of 76 mm diagonal and larger that incorporate implosion protection systems providing protection against the hazards of particles expelled forwards beyond the face. There is no intended protection against particles expelled in other directions.

46、 Compliance is tested by subjecting CRTs to the test procedures and criteria, which are given in Clauses 8 (large CRTs), 9 (small CRTs) and 10 (CRTs with protective film) of this standard. The definitions of large and small CRTs are given in Clause 3. NOTE This set of requirements replaces the curre

47、nt requirements for the mechanical safety of cathode ray tubes (CRTs) as described in IEC 60065 (Clause 18), which will be modified accordingly. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition ci

48、ted applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60065:2001, Audio, video and similar electronic apparatus Safety requirements IEC 60068-1:1988, Environmental testing Part 1: General and guidance Amendment 1 (1992) IEC 60216-1

49、:2001, Electrical insulating materials Properties of thermal endurance Part 1: Ageing procedures and evaluation of test results ISO 527-1:1993, Plastics Determination of tensile properties Part 1: General principles ISO 527-3:1995, Plastics Determination of tensile properties Part 3: Test conditions for films and sheets ISO 8510-1:1990, Adhesives Peel test for a flexible-bonded-to-rigid t