Sample

The cable length under test us 150 meters, Additional cable length is needed to connect the fibers to be tester.

Apparatus

The apparatus consists of:

1.An attenuation measuring apparatus, typically an OTDR

2.A fiber elongation strain measuring apparatus based on dispersion testing equipment

3.A specially designed tensile test machine capable of tensioning 150 meters of optical cable in six legs of 25 meters each. The machine is equipped with a motor for controlled tensioning and a load cell for measuring the actual tension applied on the cable.

Under load, the fiber does elongation by more than a pre-determined value over its initial length. The allowed elongation under installation load is typically0.25%.

Crush (Compression) per IEC-60794-1-2 Method E3

Object

The purpose of this test is to determine the ability of an optical fiber cable to withstand compression.

Sample

The sample is a representative cable length sufficient to carry out the specified test.

Apparatus

The apparatus allows a sample of cable to be crushed between a flat steel base plate and a moveable 100 mm long steel plate. The edges of the moveable plate are rounded with a radius of about 5mm.

Procedure

1.The cable sample is mounted between the plates so that lateral movement is prevented, and a pre- determined force is applied gradually. The maximum applied force is typically maintained for 10 minutes.

2.Two types of measurements may be defined.

3.The fiber attenuation is measured at the end of the 10-minute period while the cable is still under pressure.

4.Thefiberattenuationismeasured5minutesafterpressure.Thisrequirementisusuallycarriedoutathigher compressive loads than the previously described measurement.