40 Keysight Infiniium S-Series Oscilloscopes User’s Guide
2 Using the Oscilloscope
You can also mouse over the Trigger Level field and use the resulting controls to
set a particular trigger level when the scope is set for edge trigger on a particular
channel. You can drag the trigger reference indicator at the left side of the display,
or drag the trigger line itself, which appears when you click or touch the grid.