EXFO FTB -5240S/5240BP Optical Spectrum Analyzer for FTB 500 (NS-1434) - Manual (Page 211)

Setting Up the Instrument in Spectral Transmittance Mode
Optical Spectrum Analyzer 203
Setting Up Spectral Transmittance Analysis Parameters
To edit the power offset value in percentage, press Edit % button.
The percentage value entered in Edit percentage will be
converted to a corresponding equivalent value in dB.
³
Output wavelength offset (nm): indicates the offset value applied
on the output 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.
³
Output power offset (dB): indicates the offset value applied on
the output 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.
To edit the power offset value in percentage, press Edit % button.
The percentage value entered in Edit percentage will be
converted to a corresponding equivalent value in dB.