EXFO FTB -5240S/5240BP Optical Spectrum Analyzer for FTB 500 (NS-1434) - Manual (Page 210)

Setting Up the Instrument in Spectral Transmittance Mode
202 FTB-5240S/5240BP
Setting Up Spectral Transmittance Analysis Parameters
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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.
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Bandwidth 1 at (dB): Set the power level used, relative to the
channel peak power, to compute the bandwidth.
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Bandwidth 2 at (dB): Set the power level used, relative to the
channel peak power, to compute the bandwidth.
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Input wavelength offset (nm): indicates the offset value applied
on the input wavelength. You can use an offset to adjust your unit.
This does not replace a calibration performed at EXFO, but it can
help you achieve the specifications if you have determined that, for
example, your modules are used beyond the normal allowed use.
Entering a value in THz is not possible. The wavelength offset
appears below the graph, on the right, next to the
arrow.
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Input power offset (dB): indicates the offset value applied on the
input power. You can use an offset to adjust your unit. This does
not replace a calibration performed at EXFO, but it can help you
achieve the specifications if you have determined that, for
example, your modules are used beyond the normal allowed use.
The power offset appears in the graph, on the left, above the
arrow.