EXFO Inline Power Meter - Manual (Page 15)

Using the Optional Power Meters and VFL
Power Meter and VFL 11
Measuring Power or Insertion Loss
To perform power or insertion loss measurements manually:
1. If necessary, perform an offset nulling (see Nulling Offsets on page 4).
2. Check your fibers and clean them properly.
3. For insertion loss measurements, reference your power meter to a light
source (see Setting Reference Values on Your Power Meter on page 9),
then deactivate the light source.
4. If you have used a single reference patchcord, disconnect it from the
power meter port only, then attach a second reference patchcord to
the power meter.
OR
If you have used two reference patchcords, disconnect both of them at
the bulkhead.