EXFO EPM-ELS-50 - Manual (Page 14)

Measuring Power or Loss (EPM-50) 10
Measuring Power or Loss
Measuring absolute power is done the same way as referencing the power meter to
a source, except for the referencing step.
To perform power or loss measurements:
1. If necessary, perform an offset nulling (see Nulling Electrical Offsets on page 8).
2. Check and clean your fibers appropriately for optimum performance
(see Cleaning and Connecting Optical Fibers on page 7).
3. For loss measurements, reference your power meter to a light source
(see Referencing Your Power Meter to a Source on page 9), then deactivate the
light source.
4. Using the proper adapter and test jumpers, connect a fiber under test to a light
source (such as ELS-50) 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.
Fiber under test
Test
jumper
Test
jumper
Light
source
Power
meter
Adapter
Bulkhead
connector
Bulkhead
connector