EXFO FTB-7000 OTDR Series for FTB-500 - Manual (Page 111)

Testing Fibers in Template Mode
OTDR 97
Acquiring the Reference Trace
Acquiring the Reference Trace
You must acquire a reference trace before you activate the Template mode.
The acquisition parameters you define for this reference trace will be used
to acquire subsequent traces.
To acquire the reference trace:
1. Clean the connectors properly (see Cleaning and Connecting Optical
Fibers on page 26).
2. Connect a fiber to the OTDR port.
If your unit is equipped with two OTDR ports, ensure that you connect
the fiber to the appropriate port (singlemode, singlemode live, or
multimode), depending on the wavelength you intend to use.
3. Acquire a trace in Auto or Advanced test mode. If you want to test
using high resolution, you will have to select this feature before
acquiring the reference trace. For more information, see Testing Fibers
in Auto Mode on page 57 or Testing Fibers in Advanced Mode on
page 63.
C
AUTION
Never connect a live fiber to the OTDR port without a proper setup.
Any incoming optical power ranging from –65 dBm to –40 dBm will
affect the OTDR acquisition. The way the acquisition will be
affected depends on the selected pulse width.
Any incoming signal greater than –20 dBm could damage your
OTDR permanently. For live-fiber testing, refer to the SM Live port
specifications for the characteristics of the built-in filter.