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Chapter 6 Trigger System
179
When we set a specific trigger condition for a specific signal, especially when the time interval for satisfying the
trigger condition is long, we need to set the trigger mode to “Normal” so as to prevent the oscilloscope from
automatic forced trigger.
Figure 6-6 shows a conceptual demonstration of the acquisition memory. In order to understand the trigger event,
the acquisition memory can be divided into pre-trigger and post-trigger buffers. The position of the trigger event in
the acquisition memory is defined by the time reference point and trigger position (horizontal delay) settings.
Figure 6-6 Conceptual Demonstration of Acquisition Memory
All events displayed to the left of the trigger point occur before trigger. These events are called pre-trigger
messages that show events before the trigger point. All events to the right of the trigger point is called post-trigger
Trigger Event
Acquisition Memory
Pre-trigger Buffer
Post-trigger Buffer
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