EXFO FTB -5240S/5240BP Optical Spectrum Analyzer for FTB 500 (NS-1434) - Manual (Page 77)

Setting Up the Instrument in WDM Mode
Optical Spectrum Analyzer 69
Setting Up WDM Analysis Parameters
3. Select the Activate all thresholds option, to manually set the global
threshold values. If this option is not selected, all the thresholds will be
deactivated, results are displayed without a Pass/Fail status and Global
pass/fail status will not be active in the Global Results tab.
4. Enter values in the boxes as explained below:
³
Average signal power (dBm): indicates the sum of the signal
powers of all the peaks detected in the current acquisition, divided
by the total number of peaks.
³
Signal power flatness (dB): indicates the difference between the
maximum and minimum signal power values of the detected
peaks, in dB.
³
Average OSNR (dB): indicates the sum of the entire OSNR of the
peaks detected in the current acquisition, divided by the total
number of peaks.
³
OSNR flatness (dB): indicates the difference between the
maximum and minimum OSNR values of the detected peaks, in
dB.