IEC 61965-2003 pdf – Mechanical safety of cathode ray tubes

IEC 61965-2003 pdf – 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.
3.11 shaling condition where the glassware splits into thin layers 3.12 test cabinet enclosure, which is used to accommodate the CRT during tests 3.13 useful phosphor screen a) colour CRT: the visible phosphored area of the CRT as viewed from the front b) monochrome CRT: specified maximum useful phosphored area of the CRT 3.14 large CRT CRT with diagonal dimension exceeding 160 mm 3.15 small CRT rectangular CRT with a minor face dimension of at least 50 mm, a minimum diagonal dimension of 76 mm and a maximum diagonal dimension of 160 mm; a round CRT of a minimum diameter of 76 mm and a maximum diameter of 160 mm 3.16 common quality management system quality management system described in documentation which is identical with systems used in two or more plants and under one central control and management 4 General requirements 4.1 Corrosion protection If corrosion of a metal part will contribute to a failure to meet the requirements of this standard, then the part shall be adequately protected against corrosion. 4.2 Mechanical damage To improve repeatability and reproducibility of test results, it should be verified that samples submitted for test have no external visible scratching on the surface of the faceplates. 4.3 Handling Safety precautions should be addressed when handling test samples prior to and after testing. 4.4 Film-coated CRTs In the case of CRTs with film, which is not an integral part of the implosion protection system, the product must be tested without film in accordance with Tables 1 and 2 and 6 to 9.
5 Environmental conditioning 5.1 Standard atmospheric conditions for testing Unless otherwise specified, all tests and measurements shall be made under standard atmospheric conditions for testing as given in 5.3 of IEC 60068-1: – temperature: 15 °C to 35 °C; – relative humidity: 25 % to 75 %; – air pressure: 86 kPa to 106 kPa 5.2 Preconditioning Before CRTs are subjected to thermal conditioning or to testing they will be allowed to stabilize at standard atmospheric conditions for testing (see 5.1) for a minimum period of 16 h. 5.3 Thermal conditioning Details of thermal conditioning are given in Tables 1 to 9. After thermal conditioning has been completed, the CRTs will be allowed to stabilize at standard atmospheric conditions for testing (see 5.1) for a minimum period of 24 h. 6 Sampling 6.1 Sampling plans Details are given in Tables 1 to 9. 6.2 Sample numbers The numbers of CRTs and the test programmes for prestressed banded CRTs are given in Tables 1, 2, 3 and 4, for bonded frame CRTs in Tables 6 and 7 and for laminated CRTs in Tables 8 and 9. NOTE 1 Additionally, the number of samples for film-adhesion testing are given in Table 5. NOTE 2 In addition to the quantities specified in the tables, additional samples should be made available for use in case of retest to satisfy the intent of the requirement.