The History front panel button puts the instrument into History Mode. History Mode allows you to review any acquisition saved in the oscilloscope's
history buffer, which automatically stores all acquisition records until full. Not only can individual acquisitions be restored to the grid, you can "scroll"
backward and forward through the history at varying speeds to capture detailed changes in the waveforms over time. Each record is indexed and time-
stamped, and you can choose to view the absolute time of acquisition or the time relative to where you are in the history.