EXFO FPM-300 Power Meter - Manual (Page 20)

Measuring Power or Loss (FPM-300 and FOT-300) 15
Automatically Detecting Wavelength
Compatible sources (such as FOT-300 and FLS-300) can transmit their wavelength
value through the fiber, avoiding the need to manually match the source and power
meter wavelengths.
Note: When you receive an auto-wavelength signal or when the source is in
auto-switching mode, you cannot manually change the power meter
wavelength. The power meter behavior is totally determined by the
source.
To receive the auto-wavelength signal or detect the source's
auto-switching mode:
1. Connect a compatible source to your power meter.
2. Activate the source in Auto mode (FOT-300 and
FLS-300: see Modulating the Source Signal on
page 16) or in auto-switching mode.
Your power meter automatically matches the source
wavelength. If the wavelengths differ, it also beeps
and returns you to normal operating mode.