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SHS800X&SHS1000X User Manual
37
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2. Waveform Confusion: when the sample rate is lower than twice the actual
signal frequency (Nyquist Frequency), the waveform frequency reconstructed
from the sample data is lower than the actual signal frequency. The most
common aliasing is the jitter on fast edge.
3.
Waveform Leakage: when the sample rate is too low, the waveform
reconstructed from the sample data cannot reflect all the actual signal
information.
Bandwidth and Sample Rate
An oscilloscope's bandwidth is typically described as the lowest frequency at
which the input sinusoidal signal is attenuated by 3 dB (- 30% amplitude error).
Under the bandwidth frequency, the required sampling rate is f
S
= 2f
BW
according
to the sampling theory. However, the theory assumes that there are no frequency
components above f
MAX
(f
BW
in this case) in the system, which means that it
requires a system with an ideal brick wall frequency response.
Pulse disappeared
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