Optical Power measurement mode uses the MP-60 or MP-80 USB device to take
power readings of a fiber optic cable signal. The current power level as well
as the minimum, average, and max are displayed in either dBm or mW. The modulation
frequency (in Hz) and the configured signal wavelength (in nm) are also presented on screen.
The mode allows a reference to be taken which stores the current level. Measurements
are then compared to this value and displayed in dB from the reference.