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Keysight Technologies
Using Oscilloscope
Segmented Memory for
Serial Bus Applications
Application Note
Introduction
If the signals that you need to capture on an oscilloscope have
relatively long idle times between low duty cycle pulses or bursts
of signal activity, such as packetized serial data, then using a
scope with segmented memory acquisition can effectively extend
the amount of time and the number of serial packets that can be
captured at a higher sample rate.
All oscilloscopes have a limited amount of acquisition memory.
And you should be aware that a scope's memory depth
determines the amount of waveform time and the number of
serial packets the scope can capture at a particular sample rate.
Although you can easily set a scope's timebase to a very slow
time/div setting in order to capture very long time-spans and lots
of serial packets, scopes will automatically reduce their sample
rates once the maximum time-span at the scope's maximum
sample rate has been exceeded. When a scope's sample rate is
reduced, it can no longer provide precision horizontal and vertical
waveform detail (based on the scope's specified bandwidth and
maximum sample rate).
In the case of the Keysight Technologies, Inc. InfiniiVision 3000 and 4000
X-Series scopes, the maximum memory depth is 4 M points and the maximum
sample rate is 5 GSa/s. This means that the maximum amount of continuous
time that the scope can capture while still sampling at the scope's maximum
sample rate of 5 GSa/s is 800