Products > Test Equipment
Sub: Rigol's DHO800 Oscilloscope (Gibbs Effect & Aliasing Misunderstanding)
Martin72:
--- Quote ---Is it really the 100MHz model? Not hacked? There are no measurements enabled, but the risetime seems to be in the order of 1.6ns. This risetime rather suggests that the actual bandwidth is twice as much.
--- End quote ---
Not bad, not bad... ;)
It´s the 70Mhz model hacked to 100Mhz - But for whatever reason, I had measured 200Mhz (-3dB).
As for the rest, thanks for that, I'll have to look into it further.
I think it's important to know this, or to know it more precisely.
Fungus:
--- Quote from: Martin72 on November 05, 2023, 05:15:01 pm ---It´s the 70Mhz model hacked to 100Mhz - But for whatever reason, I had measured 200Mhz (-3dB).
--- End quote ---
The 100Mhz isn't an officially available option so who knows what it's doing internally. They're all capable of much more than 200Mhz.
Let's hope Rigol doesn't (or can't) address this issue.
Martin72:
--- Quote ---Let's hope Rigol doesn't (or can't) address this issue.
--- End quote ---
It´s not a bug, it´s a feature.. ;D
Good for us.
Martin72:
@gf:
--- Quote ---IMO It is not.
--- End quote ---
I had forgotten the "not"...
gf:
--- Quote from: Martin72 on November 04, 2023, 11:29:59 pm ---I had read through the whitepaper I linked to and connected the bodnar pulser to the scope again, in this case the DHO804(100Mhz).
The signal from the bodnar is 10Mhz, so it should be interpolated cleanly, regardless of whether linear interpolation or sinx/x is used.
But it doesn't, even at 1.25GSa/s you can already "discover" something and in the worst case, the 312.5MSa/s, it already looks pretty blurred.
--- End quote ---
I looked through the whole thread and could not find a 625MSa/s screenshot for the DHO800.
All screenshots are either 1.25GSa/s or 312.5MSa/s.
Could you please also post a screenshot of a Bodnar signal taken at 625MSa/s?
Does it also show overshoot, and blur/jitter due to aliasing?
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