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SDS5000X Series Digital Oscilloscope User Manual
15 Trigger
15.1 Overview
The oscilloscope only acquires waveforms of interest (i.e. the ones that satisfy
the trigger condition) and aligns all trigger events at the trigger position to form
a stable waveform display. The trigger is one of the most important features of
any oscilloscope, since we can only analyze a signal that we are able to
trigger in a reliable and stable manner.
The trigger position is movable on the display. The following diagram shows the
structure of the acquisition memory. The acquisition memory is divided into pre-
trigger and post-trigger buffers and the boundary between them is the trigger
position. Before the trigger event arrives, the oscilloscope fills the pre-trigger
buffer first, and then continuously updates it in FIFO mode until the trigger event
arrives. After the trigger event, the data fills the post-trigger buffer. When the
post-trigger buffer is full, an acquisition is completed.
Below are the definition of the states in the process of filling the acquisition
memory:
Arm: The pre-trigger buffer is not full, and the oscilloscope does not respond to
any trigger events.
Pre-trigger Buffer
Post-trigger Buffer
Trigger Event
Acquisition Memory
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