EXFO FPM-300 Power Meter - Manual (Page 18)

Measuring Power or Loss (FPM-300 and FOT-300) 13
Measuring Power or Loss
Measuring absolute power or link loss is done the same way, except for the
referencing step.
To perform power or loss measurements:
1. If necessary, perform an offset nulling (see Nulling Electrical Offsets on page 9).
2. Check and clean your fibers appropriately for optimum performance
(see Cleaning and Connecting Optical Fibers on page 8).
3. For loss measurements, reference your power meter to a light source
(see Referencing Your Power Meter to a Source on page 11), then deactivate the
light source.
4. Using the proper adapter and test jumpers, connect a fiber under test to a light
source (such as FLS-300 or FOT-300) and to the detector port of your unit.
Note: If you have referenced your power meter to a source, simply connect a
fiber under test to the test jumpers used for referencing.
5. Activate the source at the desired wavelength.
Fiber under test
Test
jumper
Test
jumper
Light
source
Power
meter
Adapter
Bulkhead
connector
Bulkhead
connector