EXFO FTB -5240S/5240BP Optical Spectrum Analyzer for FTB 500 (NS-1434) - Manual (Page 373)

Managing Results
Optical Spectrum Analyzer 365
Managing Spectral Transmittance Test Results
3. Edit the values as explained below:
³
Channel definition (GHz): indicates the limit inside which the
power values will be considered in the channel.
Centred on max peak: Channel is centered on the lowest
insertion loss peak.
ITU Grid: Select the nearest ITU channel from the peak with
lowest insertion loss.
CWDM: Select the nearest CWDM channel from the peak with
lowest insertion loss.
Custom: Channel is centered on value specified by the user.
³
Nominal wavelength or frequency (nm or Thz): indicates a
single value that represent the channels center wavelength (in nm)
or frequency (in THz). This field is editable only when Channel
definition is selected as Custom.
³
Channel distance (GHz or nm): indicates distance between the
channels. The value of channel distance will be set depending on
the selection made for the channel definition option. The channel
distance box will be enabled only when the channel center
wavelength option is set to custom.