Optical Cable Repeated Bend Testing Machine

CRB-1000 SERIES

Optical Cable Repeated Bend Testing Machine

UNIVER CRB-1000 Series Optical Fiber Cable Repeated Bending Testing Machine is intended to establish the ability of a fiber optic cable to withstand repeated bending (cyclic flexing).It allows a cable sample to be bent backwards and forwards through at an angle of 180°, the two extreme positions making an angle of 90°on both sides of vertical, while the sample is subjected to a tensile load. The bending arm is designed to permit holding the cable securely during the entire test, without crushing the optical fibers or inducing optical loss. The bending radius is controlled by replaceable cushioning reels chosen to match the cable bending radius. It is capable of cycling at a rate of 30 cycles per minute.

Brochure

Object
The purpose of this test is to determine the ability of an optical fibre cable to withstand repeated bending.
Apparatus
The apparatus shall permit a sample to be bent backwards and forwards through angles up to180°, the two extreme positions making an angle of 90° on both sides of the vertical, whilst the sample is subjected to a tensile load.
Unless otherwise specified in the detail specification, the bending radius of curvature shall be a maximum of 20 times the cable diameter or the minimum mandrel radius, whichever is greater. The minimum mandrel radius shall be 75 mm for outdoor cables, and 75 mm or 25 mm shall be agreed for indoor cables between the customer and the supplier
The apparatus shall be capable of cycling. Displacing the sample from the vertical position to the extreme right position, then oscillating to the extreme left position and returning to the original vertical position is considered to be one cycle. Unless otherwise specified in the detail specification, the bending rate shall be approximately one cycle in 2 s to 5 s.
The apparatus shall include any optical test equipment needed to measure the changes in optical performance as required in the detail specification.
Requirements
The acceptance criteria for the test shall be as stated in the detail specification. Typical failure modes include loss of optical continuity, degradation of optical transmittance or physical damage to the cable.