Atec Fluke-OF-500 - Manual (Page 39)

Using the OTDR
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OVERALL LOSS and FIBER LENGTH include the loss and
length of the launch and receive fibers, unless you use
the launch/receive fiber compensation function. See the
online help or the Technical Reference Handbook for
details on launch fiber compensation.
Fluke Networks recommends that you use launch and
receive fibers. You should also use launch/receive fiber
compensation to remove the effects of these fibers from
the OTDR measurements.
Note
Avoid using hybrid patch cords to connect to the cabling
under test. Connect the launch and receive fibers directly
to the cabling under test, using a launch fiber with the
appropriate connectors. This provides the best view of
the connectors at the ends of the cabling. Hybrid launch
fibers with various connector styles are available from
Fluke Networks.
Selecting Auto or Manual OTDR Mode
Note
You should use Auto OTDR mode when
certifying cabling with the OTDR.
From the HOME screen, press A Change Test. Select
Auto OTDR or Manual OTDR from the popup menu.
In Auto OTDR mode, the tester automatically selects
settings based on the length and overall loss of the
cabling. This mode is the easiest to use, provides the most
comprehensive view of the events on the cabling, and is
the best choice for most applications.
Manual OTDR mode lets you change settings to optimize
the OTDR for displaying specific events. See the online
help or the Technical Reference Handbook for details.