EXFO FTB -5240S/5240BP Optical Spectrum Analyzer for FTB 500 (NS-1434) - Manual (Page 345)

Managing Results
Optical Spectrum Analyzer 337
Managing Drift Test Results
2. Select a channel from the Channel History tab to view the channel
results for the selected channel.
³
Channel name: indicates the name of the channel as defined in the
channel list.
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).
³
Noise: indicates the level of the noise for the selected channel.
³
Bandwidth 3.00 dB: indicates bandwidth measured by taking the
width of a signal at 50 % linear power of the peak or -3 dB from the
peak.