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SDS2000X HD Series Digital Oscilloscope User Manual
i n t . s i g l e n t . c o m 7 5
13.2.3 Memory Management
Memory Management controls how the instrument stores the acquired samples.
Auto: The default acquisition setting. After setting the maximum memory in the Auto mode, the
oscilloscope automatically adjusts the sample rate and memory depth according to the time base.
The adjustment principle is to follow the formula:
Sample rate = number of samples/time of acquisition
Where the time of acquisition is the time corresponding to the full display (i.e. 10 horizontal divisions).
Note: The maximum memory here is the upper limit of the memory space allocated by the
oscilloscope. The actual sample points are related to the current time base and may be less than
memory depth. The actual sample points information can be obtained in the timebase descriptor box
(see the section "Timebase and Trigger" for details).
Fixed Sample Rate: The sample rate is fixed as set, and the oscilloscope automatically adjusts
memory depth according to the time base. The time of acquisition is the time corresponding to the full
display (i.e. 10 horizontal divisions).
Fixed Memory: The memory depth is fixed as set, and the oscilloscope automatically adjusts the
sample rate according to the time base. With a small time scale (such as 1 ns/div) the memory depth
is beyond the time of the full display, so it needs to zoom out the acquired frame for viewing the
complete frame in Stop mode.
Note: In Run status, the scope only processes the data on the display, which means measure, math,
decode, search, etc. analyze only the data on the display. This is identical to the "Auto" memory
management mode.
13.2.4 Roll Mode
Press the Roll button on the front panel to enter roll mode. In this mode, the waveform moves
across the screen from right to left, similar to a strip chart recorder. The horizontal delay control of the
waveform will be disabled when roll mode is active. It only operates at timebase values of 50 ms/div
and above.
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