EXFO FTB-3930 MultiTest - Manual (Page 31)

Measuring Power or Loss
Multifunction Loss Tester 25
Referencing Your Power Meter to a Source
5. Match the power meter wavelength with the source wavelength as
follows:
Scroll through the Wavelength list to switch between favorite
wavelengths of your power meter (see Defining the List of Favorite
Wavelengths on page 20).
6. Scroll through the Unit list until you get dB units to retrieve the last
saved reference.
OR
Press Reference to save the current power as the new reference.
Reference power appears (in dBm) and current loss is automatically
switched to dB.
7. Repeat the procedure for each wavelength you want to reference.