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12.1 Sampling Overview
To understand the sampling and sampling modes of the oscilloscope, you need to understand the sampling
principle, aliasing, oscilloscope bandwidth and sampling rate, oscilloscope rise time, required oscilloscope
bandwidth, and the influence of memory depth on the sampling rate.
Sampling principle
According to the Nyquist sampling principle, for a bandwidth-limited signal with the maximum frequency f
MAX
, the
equidistant sampling frequency f
S
must be twice as large as the maximum frequency f
MAX
, so that a unique signal
can be reconstructed without aliasing.
Aliasing
Aliasing occurs when the signal is under sampled (f
S
<2f
MAX
). Aliasing is signal distortion caused by incorrectly
reconstructing low frequencies from a small number of sampling points.
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