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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 1.25 GSa/s, and its display value is related to the sample rate of
the current analog channel.
Note:
1.
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.
2.
LA sample rate is displayed under the LA SampleRate menu. To indirectly
modify the LA sample rate, rotate the Horizontal
the horizontal time base 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 a standard memory depth of up to 500 Mpts.
The following equation shows the relations among memory depth, sample rate, and
horizontal time base scale:
——indicates the memory depth. The unit is pts.
MDepth
MSO7000/DS7000 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
4-9
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