4.3.2 Procedure 2
The sample shall be bent around a mandrel through 180° and kept taut during the bending. A
cycle consists of one U bend followed by a reverse U bend, and returned to the straight
position. The diameter of the test mandrel and the number of cycles shall be stated in the
relevant cable specification.
4.4  Requirements
The acceptance criteria for the test shall be stated in the relevant cable specification. Typical
failure modes include loss of optical or electrical continuity, degradation of optical
transmittance or transmission performance or physical damage to the cable.
4.5  Test report
The test report shall include:
- procedure to be used (procedure 1 or procedure 2);
- test mandrel diameter (or ratio of mandrel diameter to cable diameter);
- number of cycles;
- number of turns (for procedure 1);
- maximum allowable attenuation increase:
- during the test (if applicable),
- after the test (if applicable);
- test temperature;
- pass/fail criteria

以上问实验内容,不知道,有那位同仁做过这个测试,心轴和外径的要求,究竟有什么样的关心?