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-3dB
Figure 27
So, in practice, an oscilloscope's sample rate should be four or more times
its bandwidth: f
frequency components have a greater amount of attenuation.
See Also
Evaluating Oscilloscope Sample Rates vs. Sampling Fidelity: How to
Make the Most Accurate Digital Measurements, Agilent Application Note
1587
Oscilloscope Rise Time
Closely related to an oscilloscope's bandwidth specification is its rise time
specification. Oscilloscopes with a Gaussian- type frequency response have
an approximate rise time of 0.35/f
Agilent 1000B Series Oscilloscopes User's Guide
0dB
Aliased frequency
components
f
Limiting oscilloscope bandwidth (f
frequency components above the Nyquist frequency (f
Sample Rate and Oscilloscope Bandwidth
= 4f
S
(http://cp.literature.agilent.com/litweb/pdf/5989-
/4
f
S
N
Frequency
) to 1/4 the sample rate (f
BW
. This way, there is less aliasing, and aliased
BW
based on a 10% to 90% criterion.
BW
Capturing Data
f
S
/4) reduces
S
).
N
5732EN.pdf)
3
69
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