Contact us

Live Chat with Tek representatives. Available 9:30 AM - 5:30 PM IST


Call us at

Available 9:30 AM – 5:30 PM (IST) Business Days


Download Manuals, Datasheets, Software and more:



How is bandwidth related to rise time for oscilloscopes?

Question :

How is bandwidth related to rise time for oscilloscopes?

Answer :

Historically, oscilloscope frequency response tended to approximately follow the rule: Bandwidth x risetime = 0.35. This corresponds to a 1- or 2-pole filter roll-off in the frequency domain. Today, at the high end, most real-time digital oscilloscopes more closely follow this rule:

Bandwidth x rise time = 0.45.

This corresponds to a much steeper frequency roll-off above the specified bandwidth. The steeper roll-off is more desirable in digital oscilloscopes that oversample by 4x, 3x, or even less because it prevents aliasing by eliminating any signal above the Nyquist frequency (1/2 the sample rate – the minimum sample rate required for accurate signal representation).

How is bandwidth defined for an oscilloscope »

Learn the XYZ's of Oscilloscopes » 

This FAQ Applies to:

No product series


FAQ ID 52766

View all FAQs »