Take the sample of at least 3 metres in length, which placed under reference tension, were measured.
Uses its jaws wide enough to accommodate more than two units of core Vernier caliper, measure the diameter of the fiber core under tension, respectively, in the sample of both ends and on three points on the Middle, click the vertical position of each measurement twice.
The measurement results calculated according to the average of six times, in millimeters, accurate to 0.1 mm, as measured the diameter of the fiber core.
Six measurements shall not exceed the difference between any two values of nominal diameter 5%.
These measurements. applies only to twisted rope cores, does not apply to out of the steel wire rope core.