EXFO FTB -5240S/5240BP Optical Spectrum Analyzer - Manual (Page 85)

Setting Up the Instrument in WDM Mode
OSA 79
Setting Up Acquisition Parameters
Before performing measurements on an optical spectrum, you must select
the wavelength/frequency range to use. You can perform the scan on the
full range, on spectral bands, or select a custom range.
Note: The shorter the wavelength or frequency range, the faster the acquisition.
To set parameters in the Acquisition tab:
1. From the main window, select the Acquisition tab.
2. Select the acquisition type.