EXFO FTB-5800 Chromatic Dispersion Analyzer for FTB-400 - Manual (Page 23)

Setting Up Your Chromatic Dispersion Analyzer
Chromatic Dispersion Analyzer 17
Specifying the Fiber Under Test
Specifying the Fiber Under Test
Before making an acquisition, you must also enter information on the fiber
you are going to test. This information includes the fiber type, the data fit
and the fiber length. You can also specify the distance units to be used.
Whether you know the fiber length or not will affect your results display.
³
Unknown fiber length: results will show the total dispersion.
³
Known fiber length: results will give out the dispersion per kilometer.
Note: The units you modify are only used when you specify the fiber length. On
the scales, as well as for calculation, the distance will always remain in
kilometers.