BS/EN 60793-2-40-2016 pdf download.Optical fibres Part 2-40: Product specifications Sectional specification for category A4 multimode fibres.
IEC 60793-1-22, Optical fibres — Part 1-22: Measurement methods and test procedures — Length measurement
IEC 60793-1-40:2001, Optical fibres — Part 1-40: Measurement methods and test procedures
— Attenuation
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:Measurernent methods and test procedures — Monitoring of changes in optical transmittance
IEC 60793-1-47:2009. Optical fibres — Part 1-4 7: 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 Specifications
3.1 Dimensional requirements
Relevant dimensional attributes and measurement methods are given in Table 2. Requirements common to all category A4 fibres are indicated in Table 3.
Additional attributes that shall be specified in the family specifications for sub-categories A4f through A4h are given in Table 4.
3.2 Mechanical requirements
3.2.1 General
Mechanical attributes, test methods, and requirements for buffered fibres can be found in
IEC 60794-2-41.
Relevant mechanical attributes and test methods are given in Table 5.
Requirements common to all category A4 fibres are indicated in Table 6.
Additional attributes that shall be specified in the family specifications for sub-categories A4f through A4h are given in Table 7.
3.2.2 Tensile load test
3.2.2.1 Object
The purpose of this test is to characterize the ability of the fibre to support a load during
handling. Its purpose is to obtain values of the fibre’s tensile strength.
The fibre samples are subjected to a mechanical environment as specified below. The test shall be carried out at the standard test conditions in compliance with IEC 60068-1.
3.2.2.2 Definition of yield peak
Figure 1 shows a typical load versus elongation curve for a plastic optical fibre. The curve exhibits an initial monotonic increase in tensile load with applied elongation that goes through a load peak. The peak is followed by a decrease in load as the sample begins to undergo a ductile, irreversible elongation. Localized necking and drawing of the sample may accompany the process. This phenomenon is known as yielding and the peak is termed a yield peak.
3.2.2.3 Test 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 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
3.2.2.4 Procedure
The tensile speed shall be 100 mm/mm (±10 %). Yield strength and yield elongation are obtained from the load-elongation curve described in 3.2.2.2. Unless otherwise specified. tensile load at the yield peak and tensile load to induce 4 % elongation shall be recorded.
NOTE Elongation to breaking po,nt s not applicable to category A4 fibres.
3.2.2.5 RequIrements
The requirements are stated in the family specifications found in the normative annexes to this specification. 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.
3.3 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.BS/EN 60793-2-40-2016 pdf download.
BS/EN 60793-2-40-2016 pdf download
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