Keysight Technologies N7700 User Manual page 43

Fast Spectral Loss Measurement Application 3
You can do so by modifying the corresponding value in the options:
Set the Number of measurements kept value to 0 to turn off automatic
saves.
When tuning a device or a component, or monitoring stability, it might be
desirable to automatically have a certain number of most recent
measurements displayed simultaneously.
To do so, set the Number of measurements shown value in the options to
the desired value or to 0 to disable this feature.
Keysight N7700 Photonic Application Suite, Fast Spectral Loss Engine, User's Guide 43