IEC 60793-2-40:2021 pdf free download – Optical fibres
2Normative references
The following documents are referred to in the text in such a way that some or all of their contentconstitutes requirements of this document.For dated references, only the edition cited applies.For undated ‘references,the latest edition of the referenced document (including anyamendments) 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 – Fibregeometry
IEC 60793-1-22，Optical fibres – Part 1-22: Measurement methods and test procedures -Length measurement
IEC 60793-1-40:2019,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- Dampheat (steady state) tests
IEC 60793-1-51,Optical fibres – Part 1-51: Measurement methods and test procedures – Dryheat (steady state) tests
IEC 60793-1-52，Optical fibres – Part 1-52: Measurement methods and test procedures -Change of temperature tests
4.2.2.2Definition of yield peak
Figure 1 shows a typical load versus elongation curve for a plastic optical fibre.The curveexhibits an initial monotonic increase in tensile load with applied elongation that goes througha load peak.The peak is followed by a decrease in load as the sample begins to undergo aductile, irreversible elongation.Localized necking and drawing of the sample may accompanythe process.This phenomenon is known as yielding and the peak is termed a yield peak.
4.2.2.3Test apparatus
The length of the sample between two clamping devices shall be between 100 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 impartingconstant motion without jerking the fibre under test.The apparatus shall have the ability tosimultaneously measure and record the resulting tensile force or load. To prevent fibrebreakage,the means used to secure the fibre ends at the clamping points shall not stress thefibre excessively.
4.2.2.4Procedure
The tensile speed shall be 100 mm/min ±10 %.Yield strength and yield elongation are obtainedfrom the load-elongation curve described in 4.2.2.2.Unless otherwise specified, tensile load atthe yield peak and tensile load to induce 4 % elongation shall be recorded.
NOTE Elongation to breaking point is not applicable to category A4 fibres.
4.2.2.5Requirements
The requirements are stated in the family specifications found in Annex A to Annex J. If thefibre sample breaks at a clamping point, the test shall be regarded as invalid and another testshall be carried out.The number of samples tested shall be sufficient to allow for a statisticalanalysis.
lmplementation A4a.1 corresponds to subcategory A4a fibre specified in the second edition ofthis document,IEC 60793-2-40:2006. lmplementation A4a.2 is a higher grade of subcategoryA4a fibre in terms of attenuation and bandwidth, to achieve longer distance transmission thanimplementation A4a.1 (see Annex J for information about 520 nm transmission over A4a.2fibres).