EXFO FTB -5240S/5240BP Optical Spectrum Analyzer for FTB 500 (NS-1434) - Manual (Page 316)

Managing Results
308 FTB-5240S/5240BP
Managing WDM Test Results
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Wavelength offset (nm): indicates the offset value applied on the
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.
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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Power offset (dB): indicates the offset value applied on the 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. 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.
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Bandwidth at (dB): indicates bandwidth measured by taking the
width of a signal at x dB from the peak.
5. Press OK to save the changes, re-analyze the trace and close the
window, or press Cancel to exit without saving.
Press Restore Defaults to remove all the changes and apply the default
values.