EXFO iOLM - Manual (Page 107)

Using the Inline Power Meter (Optional on Some Models)
intelligent Optical Link Mapper 101
iOLM Acquisition with Power Meter
3. Select the SM Live Port and the iOLM wavelength from the iOLM tab.
4. Tap Start.
Note: Two power levels are considered for measurement when two wavelengths
are selected from the Wavelength(s) drop down box for the real-time
power meter display.
Note: The Power Meter acquisition is taken on the SM Live port.
Note: One channel or two channel support for the power meter depends on the
iOLM module.
The wavelengths used to take the power meter measurement during iOLM
acquisition process are the same as those used to display power levels in
real-time.