EXFO FTB -5240S/5240BP Optical Spectrum Analyzer - Manual (Page 84)

Setting Up the Instrument in WDM Mode
78 FTB-5240S/S-P/BP
Setting Up Acquisition Parameters
Setting Up Acquisition Parameters
Before performing your test, you must set the acquisition type and
parameters.
There are five types of acquisitions in WDM mode:

Single: Spectral measurement is performed once. The results are
displayed according to this measurement.

Averaging: Spectral measurements are performed based on the
number of scans that you have entered for this parameter. The trace
will be displayed after each acquisition and averaged with the previous
traces.

Real-Time: In real-time acquisition, spectral measurements are
performed continuously until you press Stop. No averaging is done for
spectral measurements. The graph and results are refreshed after each
acquisition.

InBand: The InBand type acquisition will perform a series of scans in
different polarization conditions in order to enable the InBand OSNR
calculation.

i-InBand: The i-InBand acquisition enables an adaptive intelligent
InBand OSNR calculation that takes into account the multiple scans
(up to 500) in various polarization conditions to determine the best
available InBand analysis parameters for the signals under test on a per
channel basis. With this acquisition type, you do not need to make
difficult parameter setting choices (the InBand or InBand narrow filter
and number of scans are automatically determined), especially when
you are faced with complex system configurations.
Note: The InBand and i-InBand option are available only if the module supports it
and you have purchased the corresponding InB software option.