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Capturing Data
3
Figure 25
Alaising
Oscilloscope 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
= 2f
. However, the theory assumes there are no frequency
S
BW
components above f
(f
in this case) and it requires a system with
MAX
BW
an ideal brick- wall frequency response.
Agilent 1000B Series Oscilloscopes User's Guide
67
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