Figure 8.1 Schematic Diagram Of The Acquisition Memory - Rigol DHO900 Series User Manual

After the oscilloscope starts running, it first fills the pre-trigger buffer. Then, after the
pre-trigger buffer is filled, the oscilloscope starts searching for a trigger. While
searching for the trigger, the data sampled will still be transmitted to the pre-trigger
buffer (the new data will continuously overwrite the previous data). When a trigger is
found, the pre-trigger buffer contains the events that occurred just before the trigger.
Then, the oscilloscope will fill the post-trigger buffer and display the data in the
acquisition memory. If the acquisition is initiated via the front-panel
process repeats; if the acquisition is initiated via the
a single acquisition (you can pan and zoom the currently displayed waveform).
This series provides Auto (default), Normal, and Single trigger modes.
Click or tap the trigger information label (as shown in the figure below) at the top of
the screen or press the front-panel
Sweep item, you can quickly switch the current trigger mode. The selected trigger
mode is displayed in the trigger information label at the top of the screen: A (Auto), N
(Normal), or S (Single).
• Auto: In this trigger mode, if the specified trigger conditions are not found,
triggers are forced and acquisitions are made so that signal activity is displayed
on the oscilloscope. This trigger mode can be used when the signal levels are
unknown, when the DC signals should be displayed, or when trigger conditions
occur often enough that forced triggers are unnecessary.
• Normal: In this trigger mode, triggers and acquisitions only occur when the
specified trigger conditions are found. This trigger mode can be used when the
signal is at a low repetition rate, when you only want to acquire specific events
specified by the trigger settings, or when you try to stabilize the display by
preventing the oscilloscope from auto-triggering.
• Single: In this trigger mode, a single trigger and acquisition only occur when the
specified trigger conditions are found, and then the oscilloscope stops. This
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Pre-trigger Buffer
Acquisition Memory

Figure 8.1 Schematic Diagram of the Acquisition Memory

Triggering the Oscilloscope
Trigger Event
Post-trigger Buffer
key, it stops after finishing
key to open the "Trigger" menu. In the
key, the
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