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RIGOL
Chapter 4 To Set the Sample System
Memory Depth
Memory depth refers to the number of waveform points that the oscilloscope can
store in a single trigger sample, and it reflects the storage ability of the sample
memory. DS2000E provides a maximum memory depth of 28 Mpts on both channels.
Trigger Point
T
Pre-sample
Delayed Sample
Memory Depth
Figure 4-3 Memory Depth
The relation of memory depth, sample rate and waveform length fulfills the equation
below:
Memory depth = Sample Rate (Sa/s) × Horizontal Time Base × Number of Grids
Horizontally
Wherein, for DS2000E, the number of grids horizontally is fixed at 14. Therefore,
under the same time base, higher memory depth can ensure higher sample rate.
Press Acquire Mem Depth, use
to switch to the desired memory depth (the
default is auto) and then press down the knob to select the option. You can also
press Mem Depth continuously to switch the memory depth. The memory depth
available includes Auto, 7 Kpts, 70 Kpts, 700 Kpts, 7 Mpts, and 28 Mpts.
In "Auto" mode, the oscilloscope selects the memory depth automatically according
to the current sample rate. At this point, you can adjust the memory depth indirectly
by rotating HORIZONTAL
SCALE to adjust the sample rate.
4-8
DS2000E User's Guide
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