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Trigger
The trigger mode is the most useful setting to help isolate signals of interest. When
a waveform in the waveform stream meets the trigger condition, the oscilloscope
captures this waveform as well as the neighboring part and displays them on the
screen. For digital oscilloscopes, the waveforms will be displayed continuously no
matter whether it is stably triggered, but only stable triggers can ensure a stable
display. The trigger circuit ensures that every time base sweep or acquisition starts
from the input signal and the user-defined trigger condition, namely every sweep
is synchronous to the acquisition and the waveforms acquired overlap to display
stable waveform.
The following is the schematic diagram of the acquisition memory. As shown in the
figure below, the position of the trigger event is determined by the reference time
point and the delay setting.
Trigger settings 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.
The oscilloscope provides abundant advanced trigger functions which can help
you to focus on the desired waveform details. These trigger types are edge, slope,
pulse, video, window, interval, dropout, runt, pattern and serial trigger. This
chapter will mainly introduce all these trigger functions which mentioned above in
details and tell you how to set the trigger conditions to capture desired waveform.
The contents of this chapter:
Trigger Source
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