EXFO FTB -5240S/5240BP Optical Spectrum Analyzer - Manual (Page 319)

Managing Results
OSA 313
Managing Markers
To display the automated markers:
Press the
button. The focus will be done on the currently selected
channel in the Results tab.
To manually enter a marker position value:
1. If you have not done so already, press the
button on the top
left-hand corner of the display to make the marker toolbar appear.
2. Set the marker by entering precise values in the box corresponding to it
or by dragging it on-screen.
As markers A and B appear on the graph, the following values will be
displayed in the marker toolbar.

power values corresponding to the wavelength position of both
markers (in the case of WDM, the active and reference values are
displayed; in the case of spectral transmittance and EDFA, the input
and output values are displayed).

wavelength or frequency difference between the markers (A-B)

power difference in dB between the markers