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Rigol MSO5000 HiRes mode
2N3055:
--- Quote from: balnazzar on October 30, 2022, 03:34:36 pm ---Mh, the ED's article and Tek's doc are good stuff, especially for a beginner like me. Thanks...
Would you tell me again where to find the difference about Lecroy ERES vs common High Resolution?
--- End quote ---
Google it.. It is all public access.. there a few documents on LeCroy
mawyatt:
Think the important metric regarding HiRes/ERES and other modes of enhancement, however they are implemented, is the ENOB after the mode is invoked which takes into account all the degrading/limiting factors, wether in the analog channel, ADC, or post processing numerical limits.
Things like input referred noise level and complete end to end channel linearity become issues that differentiate various systems within a given bandwidth. Various techniques are available to study such, one we often use/prefer is the classic Two Tone IMD method.
Another important factor, often overlooked, is the channel overload recovery. Where one is "looking" at a tiny signal just after a much larger part of signal that can saturate the channel. This can cause lots of issues with resolution enhancement techniques, since these may employ some form of waveform averaging. Here is where a true higher resolution ADC shines as you can "see" the tiny signal detail with the higher resolution ADC and remain still within the channel limits without resorting to post ADC resolution enhancement techniques. Of course assuming the channel noise level is low enough to allow one to "see" the tiny waveform details, which implies a basic good fundamental ENOB for the channel and ADC without resorting to enhancement techniques.
Anyway, lots of interesting metrics for these new DSOs , which in reality are really Impressive Data Acquisition Systems disguised as simply a Scope ;D
Best,
Martin72:
--- Quote from: balnazzar on October 30, 2022, 03:34:36 pm ---Would you tell me again where to find the difference about Lecroy ERES vs common High Resolution?
--- End quote ---
https://teledynelecroy.com/doc/differences-between-eres-and-hires
Fungus:
--- Quote from: Martin72 on October 30, 2022, 05:22:52 pm ---
--- Quote from: balnazzar on October 30, 2022, 03:34:36 pm ---Would you tell me again where to find the difference about Lecroy ERES vs common High Resolution?
--- End quote ---
https://teledynelecroy.com/doc/differences-between-eres-and-hires
--- End quote ---
So: Gaussian filter (eres) vs. Boxcar filter (hires)
2N3055:
--- Quote from: Fungus on October 30, 2022, 06:01:21 pm ---
--- Quote from: Martin72 on October 30, 2022, 05:22:52 pm ---
--- Quote from: balnazzar on October 30, 2022, 03:34:36 pm ---Would you tell me again where to find the difference about Lecroy ERES vs common High Resolution?
--- End quote ---
https://teledynelecroy.com/doc/differences-between-eres-and-hires
--- End quote ---
So: Gaussian filter (eres) vs. Boxcar filter (hires)
--- End quote ---
Yes, Something like that.
Technically ERES is linear phase FIR filter with Gaussian shaped convolution kernel, vs. Hires plain boxcar filter.
Difference is that ERES will have better pulse response and less BW reduction and keep number of points i.e. there is no downconversion. Also if ERES is used as a math function after the fact (on scopes that support that) you have benefit you can tweak it your hearths will because you have original data all the time.
Hires usually also yields less data points on output than input, I.E. it downcoverts to resulting lower sample rate by filtering. Note that it doesn't have to downconvert (it could just lose some data at end and begging) but it is not usually implemented that way. It is usually acquisition mode that means you don't have original data. That might have a meaning to user or not, depending of what they are doing with it.
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