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| Sighound36:
The rise time taken with the Bodnar reference (40ps) no bandwidth or high resolution mode on |
| 0xdeadbeef:
So the average step response bandwidth with the commonly used rule of thumb (0.35/t_rise) would be 764.5MHz. Anyway, as assumed, this is just the bandwidth calculated from the rule of thumb which doesn't take into account any (digital) filtering going on in the scope. At least my understanding is that the factor 0.35 is merely based on an RC lowpass filter at the input. |
| nctnico:
--- Quote from: 0xdeadbeef on February 21, 2020, 04:10:51 pm ---At least my understanding is that the factor 0.35 is merely based on an RC lowpass filter at the input. --- End quote --- That is correct. Basically you can't determine the bandwidth of a DSO using the rise time. |
| Sighound36:
Correct 0.35 is rule of thumb, though some use 0.45 depending on how good they want you to see there products. That means that a great many product literature sheets are incorrect then? https://community.keysight.com/community/keysight-blogs/oscilloscopes/blog/2016/09/01/what-is-oscilloscope-system-bandwidth-and-how-do-i-find-the-bandwidth-of-the-scope-probe |
| nctnico:
--- Quote from: Sighound36 on February 21, 2020, 04:54:41 pm ---Correct 0.35 is rule of thumb, though some use 0.45 depending on how good they want you to see there products. That means that a great many product literature sheets are incorrect then? https://community.keysight.com/community/keysight-blogs/oscilloscopes/blog/2016/09/01/what-is-oscilloscope-system-bandwidth-and-how-do-i-find-the-bandwidth-of-the-scope-probe --- End quote --- The link you added clearly says that the factor of .35 isn't set in stone. So yes, every piece of literature which blindly assumes a factor of .35 is wrong. Bandwidth (of any system) is defined as the point where the level is >3dB different compared to the reference level. |
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