EXFO FTB -5240S/5240BP Optical Spectrum Analyzer for FTB 500 (NS-1434) - Manual (Page 46)

Setting Up the Instrument in WDM Mode
38 FTB-5240S/5240BP
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The most efficient way to setup the instrument is to use one of the
favorites configurations, uploading a pre-customized acquisition and
analysis setup configuration. The operator in the field only has to press
the star button, select the appropriate configuration and press Start. As
an example, a pre-customized configuration could be: “32 channels
DWDM 50GHz”; “Toronto-Montreal CWDM” or “Vendor ABC DWDM
ROADM 40Gb”. This is explained in Managing Favorites on page 86.
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The post-processing optimized way to setup the instrument is to
change the active trace analysis parameters until satisfactory from the
Channel Results and Global Results tabs, apply those changes to the
analysis setup to use it for future measurements, and re-analyze the
trace with those parameters. This is explained in Changing Active Trace
Analysis Parameters and Re-analyzing on page 306.