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Chapter 11 Sampling System
305
The oscilloscope record length and sampling rate have the following relationship:
Sampling rate = record length/acquisition time
Generally, the oscilloscope acquisition time is exactly the display time on the current entire screen (current
horizontal time base×14).
For example, if the oscilloscope has the memory depth of 700K, the sampling rate of 1GSa/s, and the horizontal
time base of 50us/div, the acquisition time is 700us, which is 50us/div×14div.
However, when the fast time base (below 20 ns) or the record length is set to a fixed value, the oscilloscope
acquisition time does not necessarily represent the display time on the current entire screen.
For example, if the oscilloscope has the memory depth of 700K, the sampling rate of 1GSa/s, and the horizontal
time base of 20ns, the acquisition time is 700ns, which is 2.5 times of the current display time on the entire screen.
Or, if the memory depth is 140K (fixed value), the sampling rate is 1GSa/s, and the horizontal time base is 1us, the
acquisition time is 140us, which is 10 times of the current display time on the entire screen.
For a single channel in a channel pair, the maximum sampling rate of the ATO series oscilloscope is 1GSa/s.
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