Oscilloscope Rise Time - Keysight Technologies InfiniiVision 2000 X Series User Manual

0dB
-3dB
Figure 35 Sample Rate and Oscilloscope Bandwidth
So, in practice, an oscilloscope's sample rate should be four or more times its
bandwidth: f
components have a greater amount of attenuation.
See Also Evaluating Oscilloscope Sample Rates vs. Sampling Fidelity: How to Make the
Most Accurate Digital Measurements, Keysight Application Note 1587
(http://literature.cdn.keysight.com/litweb/pdf/5989-5732EN.pdf)

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
An oscilloscope's rise time is not the fastest edge speed that the oscilloscope can
accurately measure. It is the fastest edge speed the oscilloscope can possibly
produce.
Keysight InfiniiVision 2000 X-Series Oscilloscopes User's Guide
Aliased frequency
components
f /4
S
Frequency
Limiting oscilloscope bandwidth (f
reduces frequency components above the Nyquist frequency (f
= 4f . This way, there is less aliasing, and aliased frequency
S BW
f f
N S
) to 1/4 the sample rate (f
BW
based on a 10% to 90% criterion.
BW
Acquisition Control
/4)
S
).
N
12
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