EXFO FPM-300 Power Meter - Manual (Page 19)

FPM-300/FLS-300/FOT-300 14
6. Match the source and power meter wavelengths:

If the source emits an auto-wavelength signal
(see Automatically Detecting Wavelength on
page 15), the power meter automatically
matches the source wavelength.
If the source emits an auto-wavelength signal or
is in auto-switching mode (see Automatically Detecting Wavelength on
page 15 and see To receive the auto-wavelength signal or detect the source's
auto-switching mode: on page 15), the power meter automatically matches
the source wavelength.OR

Press
(power meter)
to switch between pre-selected wavelengths (see
Defining a List of Favorite Wavelengths on page 10).
7. If you want to see a loss value and your power meter displays W or dBm units,
press to access reference mode.
When the unit detects a modulated signal, it beeps and displays the modulation
value and average measured power or loss (see left illustration above). You may
notice a slightly unstable last digit.
8. If necessary, change the displayed units by pressing .
9. Repeat the procedure for other wavelengths.

REF
When power or loss is outside power limits
(see Technical Specifications on page 32)
Actual power or loss
of fiber under test
Modulation detected
dBm/W
dB