Overview
IEC 60793-1-50:2014 is an international standard published by the International Electrotechnical Commission (IEC) that specifies measurement methods and test procedures for optical fibres under damp heat (steady state) conditions. This standard provides a practical methodology to assess the durability and performance of specific optical fibre sub-categories and classes when exposed to environmental conditions of high humidity and elevated temperature over extended periods.
The key objective of IEC 60793-1-50:2014 is to determine the suitability of optical fibres-specifically sub-category A1a to A1d multimode fibres, and class B and C single-mode fibres-to maintain performance during use, storage, or transport in environments that exhibit steady high temperature and humidity. The test method outlined ensures reliable evaluation of the fibre’s optical and mechanical properties when subjected to such environmental stresses.
This second edition of the standard, published in 2014, includes significant technical revisions such as harmonization with sectional specifications for relevant fibre types and expanded applicability to class C single-mode fibres.
Key Topics
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Scope and Purpose
Focuses on evaluating optical fibre performance under damp heat steady state conditions by simulating real-life environmental exposures of 85 °C temperature and 85% relative humidity for 30 days.
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Fibre Categories Covered
- Multimode fibres: Sub-categories A1a to A1d
- Single-mode fibres: Class B and Class C (including extended applicability for Class C)
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Test Environment and Apparatus
- Environmental chamber complying with IEC 60068-2-78 (Test Cab) for controlled temperature and humidity
- Use of de-mineralized or de-ionized water to maintain humidity without contamination
- Chamber design prevents condensation dripping on specimens
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Specimen Preparation
- Fibre length requirements: ≥1000 m for multimode (A1a-A1d), ≥2000 m for single-mode (Class B and C)
- Specimens loosely coiled with appropriate bending radius ≥150 mm to avoid macro-bending effects
- Specimens dusted with talcum powder to prevent coil adhesion, except control specimens
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Measurement Procedures
- Optical attenuation measured before, during (once stabilized), and after exposure using IEC 60793-1-40:2001 methods (insertion loss or backscattering)
- Mechanical tests including coating strip force conducted before and after exposure as per IEC 60793-1-32
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Pass/Fail Criteria and Results Reporting
Detailed criteria and documentation ensure conformity and traceability of fibre performance under the test conditions.
Applications
IEC 60793-1-50:2014 is critical for manufacturers, quality assurance teams, and test laboratories involved in optical fibre production and certification. The standard ensures:
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Quality Verification
Confirms that optical fibres maintain integrity and optical performance in humid, high-temperature environments, minimizing risks in harsh applications.
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Product Development & Certification
Facilitates benchmarking of newly developed fibres against established durability requirements before market entry.
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Storage and Transportation Risk Mitigation
Confirms fibre robustness to environmental stresses possibly encountered during storage or shipping, ensuring delivered product reliability.
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System Reliability Improvement
Supports telecommunications, data centre, and industrial network providers by certifying optical fibre performance longevity under demanding climatic conditions.
Related Standards
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IEC 60068-2-78: Environmental testing - Damp heat (steady state)
Basis for test chamber conditions and environmental control.
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IEC 60793-1-40: Optical fibres - Attenuation measurement methods
Defines optical loss measurement techniques used in this standard.
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IEC 60793-1-32: Optical fibres - Coating strippability
Specifies mechanical strip force testing methods referenced.
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IEC 60793-2-10: Product specifications for multimode fibres (A1 category)
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IEC 60793-2-50: Product specifications for class B single-mode fibres
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IEC 60793-2-60: Product specifications for class C single-mode fibres
Together, these standards provide a comprehensive framework for optical fibre testing, specification, and quality assurance.
Keywords: IEC 60793-1-50, optical fibres test, damp heat steady state test, high humidity optical fibres, optical fibre performance evaluation, IEC environmental testing, multimode fibres, single-mode fibres class B and C, fibre durability test, optical fibre degradation, fibre attenuation measurement, optical fibre quality assurance.
Open preview (PDF)Optical fibres - Part 1-50: Measurement methods and test procedures - Damp heat (steady state) tests
