Atec Fluke-OF-500 - Manual (Page 68)

OF-500 OptiFiber Certifying OTDR
Users Manual
58
Using Mandrels for Testing Multimode Fiber
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.
The gray mandrels included with some OptiFiber models
are compliant with TIA/EIA-568-B for 62.5
µ m fiber with a
3 mm jacket.
Mandrels for 50 µ m fiber are available from Fluke
Networks. Refer to the appropriate standard for mandrel
requirements if you follow other standards. The OF-500
Technical Reference Handbook provides a partial list of
mandrel requirements for TIA and ISO standards.
Figure 23 shows how to wrap the fiber around a
mandrel. Place mandrels on the tester’s output fibers, as
shown in Figures 25 through 32.
In the reference and test connection diagrams shown on
the tester, mandrels are indicated by a loop in the fiber.