IEC 60793-2-40:2021 pdf download – Optical fibres – Part 2-40: Product specifications – Sectional specification for category A4 multimode fibres.
2 Normative references The following documents are referred to in the text in such a way that some or all of their content constitutes requirements 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 60068-1 , Environmental testing – Part 1: General and guidance IEC 60793-1 -20, Optical fibres – Part 1-20: Measurement methods and test procedures – Fibre geometry IEC 60793-1 -22, Optical fibres – Part 1-22: Measurement methods and test procedures – Length measurement IEC 60793-1 -40:201 9, Optical fibres – Part 1-40: Attenuation measurement methods IEC 60793-1 -41 , Optical fibres – Part 1-41: Measurement methods and test procedures – Bandwidth IEC 60793-1 -42, Optical fibres – Part 1-42: Measurement methods and test procedures – Chromatic dispersion IEC 60793-1 -43, Optical fibres – Part 1-43: Measurement methods and test procedures – Numerical aperture measurement IEC 60793-1 -46, Optical fibres – Part 1-46: Measurement methods and test procedures – Monitoring of changes in optical transmittance IEC 60793-1 -47, Optical fibres – Part 1-47: Measurement methods and test procedures – Macrobending loss IEC 60793-1 -50, Optical fibres – Part 1-50: Measurement methods and test procedures – Damp heat (steady state) tests IEC 60793-1 -51 , Optical fibres – Part 1-51: Measurement methods and test procedures – Dry heat (steady state) tests IEC 60793-1 -52, Optical fibres – Part 1-52: Measurement methods and test procedures – Change of temperature tests
3 Terms and definitions No terms and definitions are listed in this document. ISO and IEC maintain terminological databases for use in standardization at the following addresses: • IEC Electropedia: available at http://www.electropedia.org • ISO Online browsing platform: available at http://www.iso.org/obp
4.2.2.3 Test apparatus The length of the sample between two clamping devices shall be between 1 00 mm and 200 mm. The tensile strength measuring apparatus shall be a device, for example a vertical tensile tester, which provides relative motion to the test fibre. The apparatus shall be capable of imparting constant motion without jerking the fibre under test. The apparatus shall have the ability to simultaneously measure and record the resulting tensile force or load. To prevent fibre breakage, the means used to secure the fibre ends at the clamping points shall not stress the fibre excessively. 4.2.2.4 Procedure The tensile speed shall be 1 00 mm/min ± 1 0 %. Yield strength and yield elongation are obtained from the load-elongation curve described in 4.2.2.2. Unless otherwise specified, tensile load at the yield peak and tensile load to induce 4 % elongation shall be recorded. NOTE Elongation to breaking point is not applicable to category A4 fibres. 4.2.2.5 Requirements The requirements are stated in the family specifications found in Annex A to Annex J. If the fibre sample breaks at a clamping point, the test shall be regarded as invalid and another test shall be carried out. The number of samples tested shall be sufficient to allow for a statistical analysis. 4.3 Transmission requirements Relevant transmission attributes and measurement methods are given in Table 8. Additional attributes required in the family specifications are indicated in Table 9.
These tests are normally conducted periodically as type-tests for a fibre design. Unless otherwise specified: • the specimen shall be pre-conditioned by keeping it at standard atmospheric conditions for at least 24 h, and • the recovery period allowed between the completion of the environmental exposure and measuring the attributes shall be as stated in the particular environmental test method. Environmental exposure testing of subcategory A4a to A4e fibres are usually performed after the fibres are buffered (refer to IEC 60794-2-41 for environmental requirements on buffered fibres). Environmental exposure testing of unbuffered fibre is only required when the fibres are sold in unbuffered form. 4.4.2 Mechanical environmental requirements Tensile strength shall be verified according to Table 1 2 following removal of the fibre from the environment but only after cooling down the specimen at standard atmospheric conditions.