Fluke Networks CertiFiber Pro Users Manual - Manual (Page 372)

Versiv Cabling Certification Product Family
Technical Reference Handbook
350
Setting Description
IOR
(Index of refraction) 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
jacket. 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 by the manufacturer.
When you increase the IOR value, the calculated
length decreases. The tester accepts
IOR values
between 1.000 and 1.700.
Enter the value specified by the fiber
manufacturer. If you are not sure of the value, and
the accuracy of length measurements is not very
important, use the default value. See “About the
Index of Refraction” on page 351.
Backscatter
(fibers for OTDR tests
only) The backscatter coefficient 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 by the
manufacturer.
Enter the value specified by the fiber manufacturer.
If you are not sure of the value, use the default
value
Table 16. Settings for Custom Fiber Types (continued)