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SDS5000X Series Digital Oscilloscope User Manual
80 / 2 3 6 W W W. S I G L E N T. C O M
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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