User Manual

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Appendix B: Using Mandrels
You should use mandrels when testing multimode fiber.
Mandrels can improve measurement repeatability and
consistency. They also allow the use of LED light sources to
certify 50 µm and 62.5 µm fiber links for current and planned
high bit-rate applications, such as Gigabit Ethernet and
10 Gigabit Ethernet. Mandrels are available from Fluke
Networks.
WCaution
Do not use mandrels when testing singlemode
fiber.
Figure B-1 shows how to wrap the fiber around a mandrel.
Place the mandrel at the source’s output, as shown in Figure
B-2.