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Chapter 5 To Trigger the Oscilloscope RIGOL

MSO2000A/DS2000A User’s Guide 5-3

Trigger Mode

Trigger mode affects the way in which the oscilloscope searches for the trigger. 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.

Note: The acquisition memory of the oscilloscope is a cyclic buffer and the new data

would overwrite the old data until the acquisition finishes.

Figure 5-1 Schematic Diagram of the Acquisition Memory

Pre-trigger/Delayed trigger:

Acquire data before/after the trigger event. The trigger position is usually at the

horizontal center of the screen. In full-screen display, seven-grid pre-trigger and

delayed trigger information are displayed respectively. You can adjust the horizontal

position of the waveform through HORIZONTAL

POSITION to view more

pre-trigger information or delayed trigger information, through which the signal

information before/after the trigger (such as capture the glitch generated by the

circuit and analyze the pre-trigger data to find out the reasons for glitch) can be

obtained.

Press MODE in the trigger control area (TRIGGER) at the front panel or press

MENU  Sweep to select the desired trigger mode. The corresponding status light

of the mode currently selected turns on.

Auto:

After this mode is selected, the oscilloscope starts searching for trigger signals that

meet the specified condition. If trigger signals that meets the specified condition are

found, “T’D” is displayed at the upper-left corner of the user interface and stable

Pre-trigger Buffer Delayed Trigger Buffer

Trigger Event

Acquisition memory

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Rigol MSO/DS2000A Series Manual de usuario Pagina 89