IEC 61965:2000
(Main)Mechanical safety of cathode ray tubes
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 an integral protection with respect to the effects of implosion.
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Standards Content (Sample)
INTERNATIONAL IEC
STANDARD
First edition
2000-09
Mechanical safety of cathode ray tubes
Sécurité mécanique des tubes cathodiques
Reference number
Numbering
As from 1 January 1997 all IEC publications are issued with a designation in the
60000 series.
Consolidated publications
Consolidated versions of some IEC publications including amendments are
available. For example, edition numbers 1.0, 1.1 and 1.2 refer, respectively, to the
base publication, the base publication incorporating amendment 1 and the base
publication incorporating amendments 1 and 2.
Validity of this publication
The technical content of IEC publications is kept under constant review by the IEC,
thus ensuring that the content reflects current technology.
Information relating to the date of the reconfirmation of the publication is available
in the IEC catalogue.
Information on the subjects under consideration and work in progress undertaken
by the technical committee which has prepared this publication, as well as the list
of publications issued, is to be found at the following IEC sources:
• IEC web site*
• Catalogue of IEC publications
Published yearly with regular updates
(On-line catalogue)*
• IEC Bulletin
Available both at the IEC web site* and as a printed periodical
Terminology, graphical and letter symbols
For general terminology, readers are referred to IEC 60050: International
Electrotechnical Vocabulary (IEV).
For graphical symbols, and letter symbols and signs approved by the IEC for
general use, readers are referred to publications IEC 60027: Letter symbols to be
used in electrical technology, IEC 60417: Graphical symbols for use on equipment.
Index, survey and compilation of the single sheets and IEC 60617: Graphical symbols
for diagrams.
* See web site address on title page.
INTERNATIONAL IEC
STANDARD
First edition
2000-09
Mechanical safety of cathode ray tubes
Sécurité mécanique des tubes cathodiques
IEC 2000 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.
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– 2 – 61965 © IEC:2000(E)
CONTENTS
Page
FOREWORD . 5
INTRODUCTION .6
Clause
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
5 Environmental conditioning. 9
5.1 Standard atmospheric conditions for testing. 9
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. 10
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 Marking . 16
11 Normative requirements for the use of tables 1 and 2 (prestressed banded CRTs) . 16
11.1 Sampling plan I: New construction . 17
11.2 Sampling plan II: New construction with known resin or tape . 18
11.3 Sampling plan III: Tension band and alternative tension band . 18
11.4 Sampling plan IV: Alternative construction . 19
12 Normative requirements for the use of tables 3 and 4 (bonded frame CRTs). 19
12.1 Sampling plan I: New construction . 19
12.2 Sampling plan II: Alternative construction . 20
61965 © IEC:2000(E) – 3 –
Clause Page
13 Normative requirements for the use of tables 5 and 6 (laminated CRTs). 21
13.1 Sampling plan I: New construction . 21
13.2 Sampling plan II: Alternative construction . 21
Annex A (informative) Background to the development of this standard. 37
A.1 Mechanical strength test. 38
A.2 Implosion test. 38
A.3 Small CRTs (76 mm to 160 mm diagonal). 38
A.4 Evaluation time.38
Annex B (informative) Velocity and potential force of glass particles expelled
from a CRT subjected to a ball impact – Ballistic and statistical calculations . 39
B.1 Introduction . 39
B.2 Analysis without friction . 39
B.3 Analysis with friction. 45
B.4 Potential threat. 48
B.5 Conclusions. 48
Figure 1 – Example of a test cabinet . 27
Figure 2 – Example of a ball impact test. 28
Figure 3 – Example of a 2,3 kg steel missile. 29
Figure 4 – Missile impact area on a typical CRT . 30
Figure 5 – Example of a missile impact test. 31
Figure 6 – Options for scratch patterns for implosions by the thermal shock method . 32
Figure 7 – Example of high-energy impact test set-up . 33
Figure 8a – Example of steel pin for CRTs exceeding 160 mm face diagonal
used in high-energy impact test. 34
Figure 8b – Example of steel pin for CRTs from 76 mm to 160 mm diagonal
used in high-energy impact test. 34
Figure 9a – Example of 4,5 kg weight used in high-energy impact test on CRTs
exceeding 160 mm diagonal . 35
Figure 9b – Example of 0,45 kg weight used in high-energy impact test on CRTs
from 76 mm to 160 mm face diagonal. 35
Figure 10 – Example of 1,4 kg steel missile. 36
Figure B.1 – Height of the barriers and distances from the CRT face. 39
Figure B.2 – Example of the parabolic trajectory of a glass particle and the definition
of the distances. 40
Figure B.3 – Definition of the initial angle and initial velocity and the forces acting
on a particle . 41
Figure B.4 – Initial velocity required to pass over barriers at x = l (solid line)
or x = l (dashed line) as a function of the initial angle β. 43
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Page
Figure B.5 – Trajectories for a glass particle for different initial angles and an initial velocity
of 4 m/s . 43
Figure B.6 – Definition of the forces acting on a particle. 45
Figure B.7 – Measurements of a typical glass particle . 46
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) . 47
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 . 48
Table 1 – Sampling and test programme for prestressed banded CRTs
exceeding 160 mm diagonal . 22
Table 2 – Sampling and test programme for prestressed banded CRTs
from 76 mm to 160 mm diagonal . 23
Table 3 – Sampling and test programme for bonded frame CRTs
exceeding 160 mm diagonal . 24
Table 4 – Sampling and test programme for bonded frame CRTs
from 76 mm to 160 mm diagonal . 24
Table 5 – Sampling and test programme for laminated CRTs exceeding 160 mm diagonal . 25
Table 6 – Sampling and test programme for laminated CRTs
from 76 mm to 160 mm diagonal . 25
Table 7 – CRT size and deflection angle ranges. 26
Table B.1 – Values of the distances . 40
Table B.2 – Upper and lower boundary values of the initial angle . 42
61965 © IEC:2000(E) – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
MECHANICAL SAFETY OF CATHODE RAY TUBES
FOREWORD
1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of the IEC is to promote
international co-operation on al
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