RIGOL MSO/DS1000Z Series - Manual (Page 77)

Chapter 5 To Trigger the Oscilloscope RIGOL
MSO1000Z/DS1000Z User’s Guide 5-3
Trigger Mode
The following is the schematic diagram of the acquisition memory. To easily
understand the trigger event, the acquisition memory is divided into the pre-trigger
buffer and post-trigger buffer.
Figure 5-1 Schematic Diagram of the Acquisition Memory
After the system runs, the oscilloscope operates by first filling the pre-trigger buffer.
It starts searching for a trigger after the pre-trigger buffer is filled. 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 date). When a trigger is found, the
pre-trigger buffer contains the data acquired 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 activated via RUN/STOP, the oscilloscope will repeat
this process; if the acquisition is activated via SINGLE, the oscilloscope will stop
after finishing a single acquisition (you can pan and zoom the waveform currently
displayed).
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: in this trigger mode, the oscilloscope will force a trigger if the specified
trigger condition is not found.
 Normal: in this trigger mode, the oscilloscope only triggers when the specified
trigger condition is found.
 Single: in this trigger mode, the oscilloscope generates a trigger when the
specified trigger condition is found and then stops.
Note: In "Normal" and "Single" trigger modes, pressing FORCE can generate a
trigger signal forcibly.
Pre-trigger Buffer Post-trigger Buffer
Trigger Event
Acquisition Memory