EXFO FTB -5240S/5240BP Optical Spectrum Analyzer for FTB 500 (NS-1434) - Manual (Page 369)

Managing Results
Optical Spectrum Analyzer 361
Managing Spectral Transmittance Test Results
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Insertion loss max (dB): indicates the maximum difference
between a reference power level and the measured power level
(in dB).
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Bandwidth 1 at (dB): indicates bandwidth measured by taking the
width of a signal at x dB from the peak.
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Bandwidth 2 at (dB): indicates bandwidth measured by taking the
width of a signal at y dB from the peak.
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Adjacent channel isolation (dB): indicates the isolation (in dB)
taken at the channel distance on the left or right of the nominal
wavelength. The worst value between the left and right isolation is
kept.
The following information is displayed in the Analysis parameters pane:
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Channel definition (GHz): indicates the limit inside which the
power values will be considered in the channel.
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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.
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Channel range (GHz or nm): indicates the limit inside which the
power values will be considered in the channel. Integrated power
is calculated on channel width.