54 Keysight InfiniiVision 1000 X-Series Oscilloscopes User's Guide
2 Quick Reference
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
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.
Figure 3 Aliasing
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