Triggering concepts
User selected trigger conditions are used to capture waveforms for measurement and analysis.
The next figure shows how triggers fit into the overall instrument operation.
Trigger helps you to capture meaningful waveforms to display on screen. This instrument has simple edge triggers as well as a variety of
advanced triggers.
The trigger event
The trigger event establishes the time-zero point in the waveform record. All waveform record data are located in time with respect to that
point. The instrument continuously acquires and retains enough sample points to fill the pretrigger portion of the waveform record (that part
of the waveform that is displayed before or to the left of the triggering event on screen).
When a trigger event occurs, the instrument starts acquiring samples to build the post-trigger portion of the waveform record (displayed
after or to the right of the trigger event). Once a trigger is recognized, the instrument will not accept another trigger until the acquisition is
complete and the holdof
f time has expired.
Trigger sources
The trigger source provides the signal that triggers acquisition. Use a trigger source that is synchronized with the signal that you are
acquiring and displaying.
You can derive your trigger from the following sources:
• Input channels: Analog input channels are the most commonly used trigger sources. You can select any of the input channels. The
channel that you select as a trigger source will function whether it is displayed or not.
• Digital channels: These sources are available if you have a digital probe connected to a oscilloscope. You can select any combination
of digital channels.
• Bus: This source is used to trigger a parallel bus or a serial bus. You can include any combination of analog, digital, or math to build a
parallel bus or use any channel as a component in a serial bus.
Triggering concepts
2 Series MSO MSO24 and MSO22 237
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