How much Bandwidth do I need?
Capturing and Analyzing high speed signals has unique challenges. Understanding the impact of the measurement bandwidth of your scope on your results is one of them. This video explains the phenomenon.
With the DS2022E 200 MHz Oscilloscope engineers can more accurately measure the risetime of signals above 20 MHz than lower speed scopes.
RIGOL recommends having 5 X bandwidth overhead to limit risetime errors to about 2%.