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Oscilloscope Triggering
To observe and measure elements of an input waveform, it is most useful to have a stable
and reproducible image of that waveform. To accomplish this, many oscilloscopes feature
a trigger model that enables you to specify certain conditions for the input signal (only
trigger on the rising edge, for example). The input signal is evaluated according to these
settings and when a waveform meets this condition, the oscilloscope captures it and it is
displayed on the screen. Digital oscilloscopes can display the input waveform continuously
without a stable trigger present. Only a stable trigger can ensure a stable display of the
waveform. 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 a 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 Event ↓
Pre-trigger Buffer
Post-trigger Buffer
Acquisition Memory
The trigger setting should be based on the type of signal characteristics of the input signal,
thus a certain amount of knowledge about the signal-under-test is helpful in order to quickly
capture the desired waveform.
T3DSO2000 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 introduce these trigger
function types listed above in detail and explain how to set the trigger conditions in order
to capture the desired waveform.
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