Fluke Nf-mandrel User Manual
NF-MANDREL
Multimode Mandrels
Instruction Sheet
The NF-MANDREL multimode mandrels are used with an LED source and optical
power meter when measuring optical power loss in multimode fiber optic cabling.
The mandrels act as mode filters. They remove high-order modes from the optical
signal to achieve equilibrium modal distribution (EMD) when testing with LED light
sources that overfill the fiber. Mandrels are used to meet the launch conditions
specified in TIA/EIA-568B.
The NF-MANDREL-KIT is a kit that comes with the following:
• Two red mandrels for 50/125 µm fiber with 3 mm jackets
• Two gray mandrels for 62.5/125 µm fiber with 3 mm jackets
• Instruction sheet
A NF-MANDREL-50 or NF-MANDREL-625 mandrel comes with the following:
• One red mandrel for 50/125 µm fiber with 3 mm jackets or one gray mandrel for
62.5/125 µm fiber with 3 mm jackets
• Instruction sheet
PN 1997813 November 2002, Rev. 1, 2/03
© 2002, 2003 Fluke Corporation. All rights reserved. Printed in USA.
All product names are trademarks of their respective companies.
Using the Mandrels
Figures 1, 2, and 3 show how to use the mandrels.
Note
The mandrels are optimized for use on 3 mm jacketed fiber optic cable.
They may not produce the intended results on smaller-diameter cable.
Gray mandrel: 62.5/125 µm fiber
µ
Red mandrel: 50/125
Wrap 5 times
Figure 1. Wrapping the Patch Cord Around the Mandrel
m fiber
Place top wrap
in groove under
retainer
in grooves
Always use mandrels on
tester's OUTPUT
patch cord
apf02f.eps
Optical patch cords
(SC at tester ends)
Input
fiber
Output
fiber
Fiber tester
Figure 2. Using the Mandrels During Referencing
Adapters
Optical patch cords
(SC at tester ends)
Input
fiber
Output
fiber
Fiber tester
apf03f.eps
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