EXFO FTB -5240S/5240BP Optical Spectrum Analyzer for FTB 500 (NS-1434) - Manual (Page 127)

Setting Up the Instrument in Drift Mode
Optical Spectrum Analyzer 119
Defining Preferences
2. Select the Drift Results tab.
3. Select which parameters you want to display in the Channel Graph
tab from the list of available choices:
³
Center wavelength/frequency: indicates the spectral
center-of-mass for the peak in that channel.
³
Signal Power: indicates the signal power for the selected channel
(excludes noise).
³
OSNR: is the Optical Signal to Noise Ratio, given by Signal power
(according to the current calculation method, in dBm) minus
Noise (according to the current calculation method, in dBm).
4. Press OK to save the changes and close the window, or press Cancel to
exit without saving.
Press Restore Defaults to remove all the changes and apply the default
values.