EXFO FTB -5240S/5240BP Optical Spectrum Analyzer - Manual (Page 318)

Managing Results
312 FTB-5240S/S-P/BP
Managing Markers
You can also use the automated marker positioning to place the markers
around a specific channel peak. The positions are set from the results grid,
according to the following by default:

A: set at the peak wavelength “ Peak(nm)” or frequency “ƒ
peak(Thz)”.

B: set at the wavelength/frequency which corresponds to a 3 dB drop
from the peak maximum power (Signal power “p” without subtracting
the noise).

C: set at the peak power ( Peak).

D: set at 3 dB below marker C.
If you move one of the markers, these new settings are kept for the next
use of the automated markers until you reset them or select another zoom
feature.
If the channel you select does not display a signal, the markers remain in
the position that they were before.
In the case of the WDM and Drift modes, the markers are placed on the
active trace. In the case of EDFA testing, the markers will be on the output
trace.
To display the marker toolbar:
Press the
button on the top left-hand corner of the display.