Test procedures Flexing Examines the ability of a fiber optic cable to withstand repeated flexing in service. The primary purpose of this procedure is to measure any variation in the optical power transmittance of a fiber when the cable is subjected to external bending and tensional forces. A secon- dary purpose is to evaluate the possibility of physical damage that may occur as a result of such stresses. This is a specialised test inten- ded for specific types of cable, such as elevator cable or the like. Standards: IEC 60794-1-21 E8 (former IEC 60794-1-2 E8) method A 28 Temperature cycling (change) Long length cables Examines the stability behaviour of the attenuation of cables submit- ted to temperature changes. Test conditions for temperature-depen- dent measurements simulate the worst conditions. Standards: IEC 60794-1-22 F1 (former IEC 60794-1-2 F1) Short length cables (i.e. cables for patchcords) Examines the attenuation behaviour (change in attenuation) when optical fibre cables for use in patch cords are subjected to tempera- ture cycling. Standard: IEC 60794-1-22 F12 (former IEC 60794-2-50 F12) (IEC 61300-2-22) Water penetration Examines the ability of a cable to block water migration along a spe- cified length. Standards: IEC 60794-1-22 F5A/B/C (former IEC 60794-1-2 F5A/B) method B Ageing Examines the lifetime behaviour of the attenuation of cables, or physical attributes specified in the detail specification. Standards: IEC 60794-1-22 F9 (former IEC 60794-1-2 F9)
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