User Manual

5 To Trigger the Oscilloscope RIGOL
MSO4000/DS4000 User’s Guide
5-1
5 To Trigger the Oscilloscope
The trigger system of an oscilloscope allows users to tailor data collection and isolate
particular events by providing a flexible control system to “select” certain events
(rising edge, falling edge, etc.).You can set a trigger condition according to the
requirement and when a waveform in the waveform stream meets this condition, the
oscilloscope captures this waveform as well as the neighbouring part and then
displays the captured waveforms on the screen. The oscilloscope samples waveform
data continuously, but only a stable trigger can guarantee stable waveform displays.
The trigger circuit guarantees that each sweep or sample starts from the trigger
condition defined by the user. Each sweep and sample are synchronous and the
waveforms acquired overlap to display the stable waveform.
The trigger setting should be based on the features of the input signal, thus you need
to have some knowledge of the signal under test to quickly capture the desired
waveform. This oscilloscope provides abundant advanced trigger functions which can
help you to focus on the waveform details of interest.
The contents of this chapter:
 Trigger Source
 Trigger Mode
 Trigger Coupling
 Trigger Holdoff
 Noise Rejection
 Trigger Type
 Trigger Output Connector