Rigol MSO8000 Series

RIGOL Chapter 18 Function/Arbitrary Waveform Generator (Option)
18-20 MSO8000 User Guide
It is defined as the time from the beginning of one burst to that of another
burst.
Press Burst Period, then rotate the multifunction knob or use the
pop-up numeric keypad to set the desired burst period. Its available range
is from 2 ms to 500 s. By default, it is 10 ms.