| Products > Test Equipment |
| REVIEW - Rigol DS2072 - First Impressions of the DS2000 series from Rigol |
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| marmad:
--- Quote from: Teneyes on July 10, 2013, 09:56:07 am ---Yes , got it now, to get immediate tracing on manual trigger set the trigger exacting at left edge of the display, Just an OLD dude like the scan, I'm a bit slow :), before left edge, then you wait to see trace after left edge then you wait to arm --- End quote --- Yes, but just be aware that even with the trigger point all the way left, if your sample rate is too low, it can still take a long time to fill the 512 bytes. And don't worry: everything - and everybody - will slow down in the end . ;D |
| marmad:
--- Quote from: Teneyes on July 10, 2013, 10:17:42 am ---yeah sure , STOP DEAD 3:18 AM , time for bed --- End quote --- But you had just enough time before bed to push us up to 100 pages in this thread! We are the second longest thread here at EEVBlog - and bearing down on first place. >:D It took "Hantek - Tekway - DSO hack - get 200MHz bw for free" (the longest thread) 2 years, 2 months, and 5 days to get to 100 pages - while it only took us 8 months and 10 days to get here - and we weren't even offering free bandwidth. ;D |
| zibadun:
--- Quote from: marmad on July 10, 2013, 08:13:48 am ---This is basically what a 100kHz sine wave SHOULD look like at 500ms/div: This is what the Rigol displays @500ms/div using 200kSa/s: This is what the Agilent displays @500ms/div using 100kSa/s: Which is closer to the REAL signal? "Anti-aliasing" should eliminate aliasing - period. If that means that the DSO needs to 'lock' the sample size while the feature is being used - that's what it should do. --- End quote --- Agilent is more real, but it's lying about the sampling rate. It's oversampling the signal and then performs DSP on it to down convert to 100ksps. Rigol shows the real 200khz sampling rate. with only two samples per cycle it's not able to represent the amplitude correctly so it appears like the signal is amplitude modulated. Rigol shows what you asked, with no gimmicky "stochastic" sampling. If you keep an eye on the sampling rate you'd be fine. The Auto button will work in a pinch ;) Anyways I'm done commenting on aliasing. :box: |
| marmad:
--- Quote from: zibadun on July 10, 2013, 03:41:05 pm ---Agilent is more real, but it's lying about the sampling rate. It's oversampling the signal and then performs DSP on it to down convert to 100ksps. --- End quote --- It's not lying about anything - 100kSa/s means exactly that = 100,000 samples per second - you can arrive at that anyway you'd like. OTOH, the Rigol IS lying about 'Anti-Aliasing' - it DOES NOT DO IT, as anyone who understands aliasing can see. And that, after all, has been the point of this entire discussion. :) --- Quote ---Rigol shows the real 200khz sampling rate. with only two samples per cycle it's not able to represent the amplitude correctly so it appears like the signal is amplitude modulated. Rigol shows what you asked, with no gimmicky "stochastic" sampling. --- End quote --- It's no more gimmicky than averaging, high-res mode, intensity grading, or a dozen other things both DSOs do. Again, if a DSO says it does anti-aliasing - it should do it. |
| Teneyes:
100KHz oversampled at 2MSa/sec How can one tell the difference? 1st display looks like a display in Zibadun's post 2nd display I push Auto (1.7Hz AM) |
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