EXFO FTB -5240S/5240BP Optical Spectrum Analyzer for FTB 500 (NS-1434) - Manual (Page 154)

Setting Up the Instrument in Drift Mode
146 FTB-5240S/5240BP
Setting Up Drift Analysis Parameters
2. Select the Channels tab.
3. Press Import from Trace. All peaks from the current trace will be
added to the channel list.
A warning message will be displayed if any channels are overlapping. Press
OK to close the warning window.
Note: Changes can be applied to any channel at any time.
Note: If some channels were already present in the channel list, the new
channels created with the Add Current Peaks button will be added to the
list.
4. Press OK to save the changes and close the window, or press Cancel to
exit without saving.