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SDS1000X-E User Manual
41
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frequency (Nyquist Frequency), the frequency of the waveform rebuilt 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 rebuilt from the
sample data does not reflect all the actual signal information.
Bandwidth and Sample Rate
An oscilloscope's bandwidth is typically described as the lowest frequency at which input
signal sine waves are attenuated by 3 dB (- 30% amplitude error).
At the oscilloscope bandwidth, sampling theory says the required sample rate is f
S
= 2f
BW
.
However, the theory assumes there are no frequency components above f
MAX
(f
BW
in this
case) and it requires a system with an ideal brick- wall frequency response.
Pulse disappeared
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