Fluke CableAnalyzer DSX-5000, Technical Reference Handbook, Page: 354 / 700

Versiv Series Cabling Certification Product Family
Technical Reference Handbook
318
Fiber Type
Select a fiber type that is correct for the type you will test.
To see a different group of fiber types, tap
MORE
, then tap
a group. To make a custom fiber type, see Chapter 19.
Fiber Type
Settings IOR
: The tester uses the index of refraction to calculate the
optical length of the fiber. Optical length usually differs
slightly from the length of the fiber jackets in a link. This
occurs because fibers are often curved inside their jackets
and because there are small variations in the IOR of the
fibers.
Each fiber type includes a default value, which is the IOR
specified for the fiber by the manufacturer. To use a
different IOR, make a custom fiber type. See Chapter 19.
Note
If you use a length-based test limit, the IOR value
has an effect on the loss limit that the tester
calculates. See “OTDR Settings for Limits that
Calculate a Loss Limit” on page 319.
Fiber Type
Settings
(cont.)
Backscatter
: Backscatter is the backscatter coefficient. This
is a measurement of the quantity of light that the fiber
reflects back to the OTDR when the OTDR uses a 1 ns pulse.
The tester uses this value to calculate the reflectance of
events for OTDR tests and the overall ORL for the link. Each
fiber type includes a default value, which is the backscatter
coefficient specified for the fiber by the manufacturer. To
use a different backscatter value, make a custom fiber
type. See Chapter 19.
Test Limit
Select the correct test limit for the job. Generic limits, such
as
General Fiber Optic
and
Document Only
, let you do tests
when no industry-standard limit is applicable and you do
not want to make a custom limit. These limits are in the
Miscellaneous
group. To see a different group of limits,
tap
MORE
, then tap the name of a group. To make a
custom test limit, see Chapter 19.
Some test limits use the measured length of the fiber to
calculate a limit for loss. See “OTDR Settings for Limits that
Calculate a Loss Limit” on page 319.
Table 12. Settings for OTDR Tests (continued)