Exfo FTB -5240S/5240BP Optical Spectrum Analyzer for FT Manuel d'utilisateur Page 144

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Setting Up the Instrument in Drift Mode
136 FTB-5240S/5240BP
Setting Up Drift Analysis Parameters
4. Enter values in the boxes as explained below:
³ Wavelength/Frequency (nm/GHz): indicates the channel’s central
wavelength/frequency.
³ Signal power (dBm): indicates the signal power for the selected
channel (excludes noise).
³ OSNR (dB): 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).
5. 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.
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