The Optical Fiber Cable Winding (Bending) Testing Machine TT-WTM is designed to determine the ability of an optical fiber cable or cable element to withstand bending around a test mandrel such as U bend and S bend.
The test sample is a representative cable length sufficient to carry out the specified test.
The apparatus is a simple mandrel of the specified diameter on which a cable sample can be wrapped tangentially in a close helix.
The sample is wrapped in a close helix around the mandrel at a uniform rate. Sufficient tension is applied to ensure that the sample contours the mandrel. The sample then is unwrapped.
A cycle consists of one wrapping and one unwrapping.
This test is often performed at low temperature to verify the cable ability to be installed at such temperatures without being damaged.