SDS1000X-E User Manual
40
However, digital signals have frequency components above the fundamental frequency
(square waves are made up of sine waves at the fundamental frequency and an infinite
number of odd harmonics), and typically, for 500 MHz bandwidths and below,
oscilloscopes have a Gaussian frequency response.
So, in practice, an oscilloscope's sample rate should be four or more times its bandwidth:
f
S
= 4fBW. This way, there is less aliasing, and aliased frequency components have a
greater amount of attenuation.
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. The
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