Versiv Series Cabling Certification Product Family
Technical Reference Handbook
250
If you must do tests in Far End Source mode with a different
multimode source, and the source is not approved by Fluke
Networks for use with the TRCs, use standard mandrels. Make
sure you use the size of mandrel that is correct for 50 μm or
62.5 μm fiber, and read all instructions for the source and
mandrel.
WCaution
If you use mandrels for tests on multimode fiber, do
not use test reference cords made from bend-
insensitive fiber. The mandrels possibly will not
remove all of the modes that can make your loss
measurements unreliable.
About APC Connectors
When you do tests on links with APC (angled physical contact)
connectors, use only test reference cords with APC connectors on
the ends connected to the link. If you connect non-APC
connectors to the link, the connectors will cause large reflections
that make loss measurements inaccurate.
For tests on links with APC connectors, use test reference cords
that also have APC connectors on the ends connected to the
tester’s input ports. This is necessary for the 1 jumper reference
method. You can connect APC connectors to the tester’s input
ports because the fiber does not touch the lens on the input port.
WCaution
Do not connect APC connectors to the output or
input ports. An APC connector can damage the UPC
fiber endface in the ports. Also, APC connectors will
not receive enough optical power from the tester to
give you reliable test results.
Figure 107 shows the TRCs necessary for tests on links with APC
connectors.
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