Selecting Auto Or Manual Otdr Mode; About Launch And Receive Fibers - Fluke OF-500-10 Technical Reference Handbook

Selecting Auto or Manual OTDR Mode

You should use Auto OTDR mode when
certifying cabling with the OTDR.
From the HOME screen, press
Auto OTDR or Manual OTDR from the popup menu.
You can also switch between test modes by selecting Auto
OTDR or Manual OTDR from the FUNCTIONS 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 "Using
Manual OTDR Mode" on page 3-46 for details.
Note
A
Change Test. Select
Setting Up for OTDR Testing
Tip: To see the settings used for an OTDR test, press
View Details on the OTDR SUMMARY screen; then
A
press OTDR Settings. The settings used may be
slightly different from the nominal values selected on
the OTDR tab.

About Launch and Receive Fibers

Launch and receive fibers let the tester measure the loss
and reflectance of the first and last connectors in the
cabling, and include those connectors in ORL (optical
return loss) measurements. Without launch and receive
fibers, no backscatter is available before the first
connector and after the last, so the tester cannot measure
the connectors' characteristics.
If the first or last connection in the cabling is bad, and you
do not use launch and receive fibers, the OTDR test may
pass because it does include measurements from the bad
connection.
OVERALL LOSS and FIBER LENGTH include the loss and
length of the launch and receive fibers, unless you use the
launch fiber compensation function.
Using the OTDR
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C
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