EXFO FTB-5500B PMD Analyzer - Manual (Page 39)

Setting Up the Polarization Mode Dispersion Analyzer
Polarization Mode Dispersion Analyzer 31
Averaging Measurements
Averaging Measurements
When you need extreme precision, you can add one polarization
scrambler at the source output port and one at the receiver input port and
use the averaging-measurements mode.
This testing mode will average the interferometric envelops at several
states of polarization, which allows very precise measurements. If you
intend to use this mode, you must provide a number of measurements
(scans) corresponding to the number of polarization states to test.
To average measurements:
1. From the main window, click the Parameters tab, select the Use
Averaging-Measurements Mode check box.
2. In the Measurement Count box, enter the number of measurements
that will be performed during the averaging process.