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Chapter 4 To Set the Sample System RIGOL
MSO7000/DS7000 User's Guide 4-9
2. LA sample rate is displayed under the LA Sa Rate menu. To indirectly modify
the LA sample rate, rotate the Horizontal SCALE knob to adjust 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.
T
Trigger Point
Pre-sample Delayed Sample
Memory Depth
Figure 4-4 Memory Depth
The following equation shows the relations among memory depth, sample rate, and
horizontal time base scale:
MDepth SRate TScale HDivs
MDepth
——indicates the memory depth. The unit is pts.
SRate
——indicates the sample rate. The unit is Sa/s.
TScale
——indicates the horizontal time base scale. The unit is s/div.
HDivs
——indicates the number of grids in the horizontal direction. The unit is div.
Therefore, under the same horizontal time base scale, a higher memory depth can
ensure a higher sample rate.
Press Acquire Mem Depth, then rotate the multifunction knob to switch to
the desired memory depth, and then press down the knob to select the option. You
can also press the Mem Depth key continuously or enable the touch screen to
select the memory depth. By default, the memory depth is Auto.
For analog channels:
― In single-channel mode, the memory depths available include Auto, 1 Kpts, 10
Kpts, 100 Kpts, 1 Mpts, 10 Mpts, 25 Mpts, 50 Mpts, 100 Mpts, 125 Mpts
(optional), 250 Mpts (optional), and 500 Mpts (optional).
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