EXFO MAX-700 - Manual (Page 115)

Customizing the OTDR Application
MAX-700 103
Customizing the Acquisition Time Values
Customizing the Acquisition Time Values
Note: This function is available in Advanced mode only.
You can customize the values associated with the Time dial. The
acquisition time values represent the time during which the OTDR will
average acquisitions.
Note: The Auto and Real values cannot be modified.
You can customize the acquisition time to improve the signal-to-noise ratio
(SNR) of the trace and enhance the detection of low-level events. The SNR
improves by a factor of two (or 3 dB) each time the acquisition time is
increased by a factor of four.