EXFO FTB-5600 Distributed PMD Analyzer - Manual (Page 133)

Optimizing Measurements
Distributed PMD Analyzer 127
Use an Optimized Number of Averagings
Use an Optimized Number of Averagings
The number of averagings is the light pulse averaging used to obtain each
individual P-OTDR trace. If you want to have better measurable dynamics,
you should select a higher number of averagings. Remember however that
this will result in a longer acquisition time.
Should a windy environment or any other reason that causes SOPs to vary
over a time period when acquiring each individual P-OTDR trace on an
FUT, using a lower number of averagings may be helpful in improving the
measurement. However, you will obtain less dynamics.
Note: You should avoid taking the measurement if the light SOP from the FUT
varies largely in a time period required for acquiring each individual
P-OTDR. An SOP variation that is too high during the time period required
for acquiring each individual P-OTDR will result in the instrument not being
able to measure the fiber PMD correctly.