User Manual

5 To Trigger the Oscilloscope RIGOL
DS4000 User’s Guide
5-3
Trigger Mode
Trigger mode affects the way in which the oscilloscope searches for the trigger. The
following is the schematic diagram of the acquisition memory. As shown in the figure
below, the position of the trigger event in the acquisition memory is determined by
the reference time point and the delay setting.
Pre-trigger/Delayed trigger:
Acquire data before/after the trigger event. The trigger position is usually at the
horizontal center of the screen. In full-screen display, seven-grid pre-trigger and
delayed trigger information are displayed respectively. You can adjust the horizontal
position through HORIZONTAL POSITION to view more pre-trigger
information or view the delayed trigger information at most 1 second after the trigger,
through which the signal information before/after the trigger (such as capture the
glitch generated by the circuit and analyze the pre-trigger data to find out the
reasons for glitch) can be obtained.
Press MODE in the trigger control area (TRIGGER) at the front panel or press
MENU  Sweep to select the desired trigger mode. The corresponding status light
of the mode currently selected turns on.
Pre-trigger Buffer
Post-trigger Buffer
Trigger Event
Acquisition memory
MODE
Auto
Nomal
Single