Agilent Technologies 1660A Series User Reference page 271

The Waveform Menu
Sample Period Display (Timing only)
Timing waveforms are reconstructed relevant to the sample period. The
shorter sample period puts more sample points on the waveform for a more
accurate reconstruction but also fills memory more quickly.
If the sec/Div is changed resulting in a change in the next sample period, you
must run the analyzer again before the current sample period display is
updated.
Sample Points
14–11