| Products > Test Equipment |
| Sub: Rigol's DHO800 Oscilloscope (Gibbs Effect & Aliasing Misunderstanding) |
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| 2N3055:
--- Quote from: Martin72 on October 26, 2023, 09:37:22 pm --- --- Quote ---That is why I kepp repeating that DHO800 samples properly and DHO900 does not unles in very limited usage scenario. DHO800 with 100 MHz BW should be largely immune to this. Unless you manually reduce sample rate or memory length at long timebases. --- End quote --- Like this. --- End quote --- THANK YOU!! |
| Mechatrommer:
--- Quote from: Martin72 on October 26, 2023, 09:37:22 pm --- --- Quote ---That is why I kepp repeating that DHO800 samples properly and DHO900 does not unles in very limited usage scenario. DHO800 with 100 MHz BW should be largely immune to this. Unless you manually reduce sample rate or memory length at long timebases. --- End quote --- Like this. --- End quote --- so both siglent and rigol can show false signal at lower sampling rate ;D i was interested that much earlier in this thread, the very false (sinc) signal was used to argue that rigol displayed signal is incorrect, ie hiding "accurate" signal representation, it turned out, that "accurate" representation is just artifact from sinc interpolation ;D this was my intention, to clear things up and lets argue fairly apple to apple... and not messing up with other aspects as iMo mentioned just above. another factor already answered by Kleinstein about differing input impedance and respond inside the dso front end filter... https://www.eevblog.com/forum/testgear/rigols-new-dho800-oscilloscope-unbox-teardown/msg5076118/#msg5076118 ps: i need to find where that sinc interpolation setting in rigol and turn it off, its no use anyway at trying to represent "accurate" signal by interpolation. |
| Martin72:
--- Quote from: tautech on October 26, 2023, 09:39:21 pm ---Stock or hacked ? --- End quote --- Right out of the box (70Mhz). |
| Fungus:
--- Quote from: Mechatrommer on October 26, 2023, 10:21:01 pm ---it turned out, that "accurate" representation is just artifact from sinc interpolation ;D --- End quote --- The sinc function is only a very minor player here. --- Quote from: Mechatrommer on October 26, 2023, 10:21:01 pm --- i need to find where that sinc interpolation setting in rigol and turn it off, its no use anyway at trying to represent "accurate" signal by interpolation. --- End quote --- sinc isn't the problem, lack of bandwidth is. PS: There won't be a way to turn it off. It would be a disaster to just draw lines between the dots. |
| wasedadoc:
--- Quote from: Mechatrommer on October 26, 2023, 07:15:38 pm ---LC circuit cannot produce "non-causal" effect, can it? --- End quote --- Yes it cetainly can. Ask anyone* who is competent to design high quality low pass filters for video signals. Passive circuits with capacitors and inductors. ( * I am not such a designer but I worked with those who were.) |
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