SIST EN 61965:2004

Mechanical safety of cathode ray tubes

Applicable to cathode ray tubes and cathode ray tube assemblies which are intended for use as components in apparatus and which have integral protection with respect to the effects of implosion. A 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 implosion.

Mechanische Sicherheit von Kathodenstrahlröhren

Sécurité mécanique des tubes cathodiques

Applicable to cathode ray tubes and cathode ray tube assemblies which are intended for use as components in apparatus and which have integral protection with respect to the effects of implosion. A 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 implosion.

Mechanical safety of cathode ray tubes (IEC 61965:2003

General Information

• Status: Published
• Publication Date: 30-Jun-2004
• ICS: 31.120 - Electronic display devices
• Technical Committee: SS EIT - Technical Board for the electrotechnical, information technology and telecommunications fields
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Jul-2004
• Due Date: 01-Jul-2004
• Completion Date: 01-Jul-2004
• Ref Project: EN 61965:2003 - Mechanical safety of cathode ray tubes

Standards Content (Sample)

SLOVENSKI SIST EN 61965:2004

STANDARD
julij 2004
Mechanical safety of cathode ray tubes (IEC 61965:2003
ICS 31.120 Referenčna številka
SIST EN 61965:2004(en)
©  Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljeno

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EUROPEAN STANDARD EN 61965
NORME EUROPÉENNE
EUROPÄISCHE NORM October 2003

ICS 31.100 Supersedes EN 61965:2001


English version


Mechanical safety of cathode ray tubes
(IEC 61965:2003)


Sécurité mécanique  Mechanische Sicherheit
des tubes cathodiques von Kathodenstrahlröhren
(CEI 61965:2003) (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 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 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.

CENELEC members are the national electrotechnical 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.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische 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

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EN 61965:2003 - 2 -
Foreword

The text of document 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 EN 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 the 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 been added by CENELEC.
__________

Endorsement notice

The text of the International Standard IEC 61965:2003 approved by CENELEC as a European Standard
without any modification.
__________

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- 3 - EN 61965:2003
Annex ZA
(normative)

Normative references to international publications
with their corresponding European publications
This European Standard incorporates by dated or undated reference, provisions from other
publications. These normative references are cited at the appropriate places in the text and the
publications are listed hereafter. For dated references, subsequent amendments to or revisions of any
of these publications apply to this European Standard only when incorporated in it by amendment or
revision. For undated references the latest edition of the publication referred to applies (including
amendments).
NOTE When an international publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.
Publication Year Title EN/HD Year
IEC 60065 (mod) 2001 Audio, video and similar electronic EN 60065 2002
apparatus - Safety requirements

IEC 60068-1 1988 Environmental testing
+ corr. October 1988 Part 1: General and guidance
+ A1 1992 EN 60068-1 1994

IEC 60216-1 2001 Electrical insulating materials - EN 60216-1 2001
Properties of thermal endurance
Part 1: Ageing procedures and
evaluation of test results

ISO 527-1 1993 Plastics - Determination of tensile
+ corr. 1 1994 properties EN ISO 527-1 1996
Part 1: General principles

ISO 527-3 1995 Part 3: Test conditions for films and EN ISO 527-3 1995
sheets

ISO 8510-1 1990 Adhesives - Peel test for a flexible- EN 28510-1 1993
bonded-to-rigid test specimen assembly
Part 1: 90 degree peel

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INTERNATIONAL IEC
STANDARD
61965
Second edition
2003-07
Mechanical safety of cathode ray tubes
Sécurité mécanique des tubes cathodiques
© IEC 2003 ⎯ Copyright - all rights reserved
No part of this publication may be reproduced or utilized in any form or by any means, electronic or
mechanical, including photocopying and microfilm, without permission in writing from the publisher.
International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland
Telephone: [phone] Telefax: [phone] E-mail: [e-mail]  Web: www.iec.ch
PRICE CODE
Commission Electrotechnique Internationale
XA
International Electrotechnical Commission
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For price, see current catalogue

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– 2 – 61965 © IEC:2003(E)
CONTENTS
FOREWORD . 5
INTRODUCTION .6
1 Scope . 7
2 Normative references. 7
3 Definitions . 8
4 General requirements . 9
4.1 Corrosion protection . 9
4.2 Mechanical damage. 9
4.3 Handling . 9
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 Sampling .10
6.1 Sampling plans .10
6.2 Sample numbers.10
6.3 Compliance .10
7 Test preparation and set-up .10
7.1 Scratch patterns .10
7.2 Barriers .11
7.3 Mounting .11
7.4 Mounting position .11
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 Mechanical 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 film .16
10.1 General .16
10.2 Film scoring pattern for CRTs with protective film .16
10.3 Peel test .17
10.4 Immersion test.17
11 Marking .17
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
13.3 Sampling plan III: Tension band and alternative tension band.19
13.4 Sampling plan IV: Alternative construction .20

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61965 © IEC:2003(E) – 3 –
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 plan II: New construction with known resin, tape, film or adhesive.22
14.3 Sampling plan III: Alternative tension band .22
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 force requirements where alternative thermal conditioning is
to be performed .24
15.2 Tensile strength test where alternative thermal conditioning is to be
performed.24
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 plan II: Alternative construction .26
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 construction .26
Annex A (informative)  Background to the development of this standard.46
A.1 Mechanical strength test .47
A.2 Implosion test .47
A.3 Small CRTs (76 mm to 160 mm diagonal) .47
A.4 Evaluation time .47
Annex B (informative) Velocity and potential force of glass particles expelled from a
CRT subjected to a ball impact – Ballistic and statistical calculations .48
B.1 Introduction.48
B.2 Analysis without friction.48
B.3 Analysis with friction .54
B.4 Potential threat .57
B.5 Conclusions .57
Figure 1 – Example of a test cabinet .35
Figure 2 – Example of a ball impact test.36
Figure 3 – Example of 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 – Steel 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
Figure B.1 – Height of the barriers and distances from the CRT face.48

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– 4 – 61965 © IEC:2003(E)
Figure B.2 – Example of the parabolic trajectory of a glass particle 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 (solid line) or x = l
1 2
(dashed line) as a function of the initial angle β.52
Figure B.5 – Trajectories 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 initial
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 CRTs 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 banded 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
diagonal .32
Table 7 – Sampling and test 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
diagonal .33
Table 9 – Sampling and test programme for laminated CRTs from 76 mm to 160 mm
diagonal .33
Table 10 – CRT size and deflection angle ranges.34
Table B.1 – Values of the distances .49
Table B.2 – Upper and lower boundary values of the initial angle.51

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61965 © IEC:2003(E) – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
MECHANICAL SAFETY OF CATHODE RAY TUBES
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, and Guides (hereafter referred to as “IEC Publication(s)”). Their preparation is entrusted to
technical committees; any IEC National Committee interested in the subject dealt with may participate in this
preparatory work. International, governmental and non-governmental organizations liaising with the IEC also
participate in this preparation. IEC collaborates closely with the International Organization for Standardization
(ISO) in accordance with conditions determined by agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence between any
IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or other
damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and expenses arising
out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 61965 has been prepared by IEC technical committee 39:
Electronic tubes.
This second edition cancels and replaces the first edition published in 2000. This second
edition constitutes a technical revision.
The main change with respect to the previous edition is the inclusion of the requirements for
cathode ray tubes with film attached to the face plate.
The text of this standard is based on the following documents:
FDIS Report on voting
39/264/FDIS 39/265/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
The committee has decided that the contents of this publication will remain unchanged until 2005.
At this date, the publication will be
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.

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– 6 – 61965 © IEC:2003(E)
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 contained 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 wider 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 experience 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 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 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 subsequent relaxation of mechanical stresses in the CRT from the
implosion protection system.

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61965 © IEC:2003(E) – 7 –
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 intended 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, 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 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 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.
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 current 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 cited 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 60216-1:2001, 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 test specimen assembly
– Part 1: 90 degree peel

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– 8 – 61965 © IEC:2003(E)
3 Definitions
For the purposes of this document the following definitions apply.
3.1
bonded frame
system employing a preformed metal frame that covers the periphery of the CRT rim area.
The space or void between the CRT rim and the metal frame is filled with resin or equivalent
3.2
CRT diagonal
nominal diagonal of the glass envelope at its maximum dimension (for example, mould-match
line) excluding any hardware
3.3
CRT envelope
structure consisting of a face or faceplate, funnel and neck assembly
3.4
devacuation
equalization of the pressure in a CRT relative to the ambient pressure
3.5
fracture
one or more cracks in the faceplate or funnel causing a rapid or slow devacuation of the
CRT envelope
3.6
glass particle
piece of glass that exceeds 0,025 g in weight
3.7
implosion
devacuation due to the rapid and sudden inward collapse of a CRT envelope, usually
accompanied by a loud report
3.8
laminated CRT
system that provides a separate external safety panel bonded to the face of the CRT
...