Fluke DTX-1800, Technical Reference Handbook

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DTX Series CableAnalyzer
Technical Reference Handbook
8-12
Using Mandrels for Testing Multimode Fiber
You should use mandrels when testing multimode fiber
with the DTX-MFM2 fiber modules. 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.
W
Caution
Do not use mandrels when testing with the
DTX-GFM2 fiber modules.
The gray mandrels included with the DTX-MFM2 are
compliant with ANSI/TIA-568-C for 62.5 µm fiber with a
3 mm jacket.
The red mandrels included with the DTX-CLT CertiFiber
multimode kits are compliant with ANSI/TIA-568-C for
50 µm fiber with a 3 mm jacket. These mandrels are also
available from Fluke Networks. Refer to the appropriate
standard for mandrel requirements if you follow other
standards.
Table 8-1 shows a partial list of mandrel requirements for
TIA standards.
Figure 8-6 shows how to wrap the fiber around a mandrel.
Place mandrels on the tester’s output fibers, as shown in the
figures for reference and test connections.
In the reference and test connection diagrams shown on
the tester, mandrels are indicated by a loop in the fiber.
Table 8-1. ANSI/TIA-568-C Mandrel Requirements
Fiber core
size Standard
Wraps Around
Mandrel
Mandrel Diameter for
900 µm Buffered Fiber
Mandrel Diameter for 3 mm
(0.12 in) Jacketed Cable
50 µm ANSI/TIA-568-C.0 6.4.2.1 5 25 mm (1.0 in) 22 mm (0.9 in)
62.5 µm ANSI/TIA-568-C.0 6.4.2.1 5 20 mm (0.8 in) 17 mm (0.7 in)