While Dave dissects their bodies, I seem to have taste for their brain contents
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This puppy's brains are now properly torn apart and splattered across some graphs. Initially just wanted to check if there is risetime difference <=200mV/div & >=500mV/div. Kink there is in graph. But noticed that Sin(x)/x causes noticeable overshoot.
Teaser image from PDF:
Did risetime test across vertical setting ranges in 1GSa/s and 250MSa/s Sin(x)/x ON/OFF modes.OFF mode looked a bit more logical than wavy CGI in ON mode.
![](https://www.eevblog.com/forum/testgear/rigol-ds1054z-bandwidth/?action=dlattach;attach=280266)
So I did the second test using Testec TT-DE 112 950MHz demodulator probe as scalpel.20, 40, 60, 80, 100, 120MHz sine.
350mVpp and 3500mVpp signal levels.
1GSa/s Sinxx=ON; 250MSa/s Sinxx=ON; 250MSa/s Sinxx=OFF
- Looked at gen output after test cable & 50ohm pass-thru using demod and Agilent U1272A. No level dropoff with rising freq, gen is good then.
- Did run first testset (1GSa/s) with demodulator and scope after pass-thru. Level dropoff detected with rising freq just like it should be over scope input.
- Compared if demodulator affected scope readings - near zero effect.
- Did run all testsets (3x2x6) w/o demodulator, recorded voltages and risetimes.
Adjusted demod amplitudes to start of each testset 20MHz reading in Excel.
Graphed demod voltages with scope voltages.
Teaser image from PDF:![](https://www.eevblog.com/forum/testgear/rigol-ds1054z-bandwidth/?action=dlattach;attach=280272)
Noticed:
- Sinxx has heavy effect on risetime only when looking at step response, not when looking at stable sine.
- 50mV/div and 500mV/div have so large relative voltage differences with Sinxx=ON that seem to belong to different scopes. 500mV/div overshoots big time when looking at normalized graphs.
- With Sinxx=OFF normalized response graphs are almost identical.
Conclusion:
Everything happening with Sinxx on just pure CGI. Probably Sinxx=OFF is not a filter, but (more closer to) true response that gets hack-o-boosted big time. How else to explain massive sine Vpp overshoot, especially in 250MSa/s case?
Think I had my way with this thing now. Maybe should cook it instead of christmas turkey
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