La Sample Rate; Memory Depth - Rigol MSO5000-E Series User Manual

Chapter 4 To Set the Sample System

LA Sample Rate

LA sampling is the process of sampling on the compared digital signals at a certain
time interval. LA sample rate is the reciprocal of the time interval. For example, if the
LA sample rate is 500 MSa/s, it indicates that the oscilloscope will make data
acquisition on the digital signals at an interval of 2 ns. The maximum LA sample rate
of the oscilloscope is 1 GSa/s, and its display value is related to the sample rate of the
current analog channel.
Note:
The digital signals here mentioned refers to the signal obtained from the
⚫
comparison between the input signal and the user-defined threshold level. The
rule of the comparison is that when the amplitude of the input signal is greater
than the threshold level, it is judged to be the logic high level; when the
amplitude of the input signal is smaller than the threshold level, it is judged to
be the logic low level.
LA sample rate is displayed under the LA SampleRate menu. To indirectly
⚫
modify the LA sample rate, rotate the Horizontal
the horizontal timebase or modify the memory depth.

Memory Depth

Memory depth refers to the number of points of the oscilloscope that can store in one
trigger acquisition. It reflects the storage capability of the acquisition storage. This
oscilloscope is equipped with memory depth of up to 100 Mpts (option).
The following equation shows the relations among memory depth, sample rate, and
horizontal timebase scale:
——indicates the memory depth. The unit is pts.
MDepth
MSO5000-E User Guide
Trigger Point
T
Pre-sample
Memory Depth
Figure 4-4 Memory Depth
= 
MDepth SRate TScale HDivs
SCALE knob to adjust
Delayed Sample

RIGOL
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