Rigol MSO8000 Series, Руководство пользователя

Страница: 94 / 396

RIGOL
Chapter 5 To Trigger the Oscilloscope
5-4 MSO8000 User Guide
Method 1: Enable the touch screen and drag the trigger level line to adjust the
trigger level. For details about the operations, refer to descriptions in "Drag"
section.
Method 2: Enable the touch screen function, and tap the trigger setting label
at the upper-right corner of the screen. The following window is
displayed. Tap the icon at the right side of the Level input field to
decrease or increase the trigger level. You can also tap the Level input field to
input a specific value with the displayed numeric keypad.
Trigger Mode
The following is the schematic diagram of the acquisition memory. To easily
understand the trigger event, we classify the acquisition memory 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 data). 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 currently displayed
waveform).
Pre-trigger Buffer Post-trigger Buffer
Trigger Event
Acquisition Memory
Level Input Field Decrease the level Increase the level