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| miguelvp:
I did try to measure waveforms per second on my scope. My Rigol DS2000 has a spec of 50,000 wfrms/s, I can get up to 48,000 wfrms/s, If and only If I let the automatic memory depth to be 700 points, so to achieve 48,000 wfrms/s you have to be looking at a 5ns per division and the voltage and other things seem to matter as well. If I manually select the minimal selection of 14K points I get 5,000 wfrms/s, and if I want anything with deeper memory then forget about it. https://www.eevblog.com/forum/testgear/first-personal-'scope-purchase/msg681691/#msg681691 Edit: I didn't put on that post how I measured it, I did put a frequency counter on the trigger out BNC in the back. |
| markone:
Ok, just to give an idea, i made an animated PNG built with @ 5ns-1.00GSa/s - 12K mem captured screens, i set the frame rate in order to reproduce what i can see live on the screen. |
| marmad:
--- Quote from: miguelvp on February 03, 2016, 04:24:15 pm ---My Rigol DS2000 has a spec of 50,000 wfrms/s, I can get up to 48,000 wfrms/s, If and only If I let the automatic memory depth to be 700 points, so to achieve 48,000 wfrms/s you have to be looking at a 5ns per division and the voltage and other things seem to matter as well. --- End quote --- I'm not sure this is the correct thread to discuss this, but virtually every DSO manufacturer always specifies maximum wfrm/s using the lowest memory depth possible with dots (not vectors) selected. Of course, it's the fastest speed - so they use the settings that would achieve the fastest speed. |
| miguelvp:
--- Quote from: marmad on February 03, 2016, 04:43:29 pm --- --- Quote from: miguelvp on February 03, 2016, 04:24:15 pm ---My Rigol DS2000 has a spec of 50,000 wfrms/s, I can get up to 48,000 wfrms/s, If and only If I let the automatic memory depth to be 700 points, so to achieve 48,000 wfrms/s you have to be looking at a 5ns per division and the voltage and other things seem to matter as well. --- End quote --- I'm not sure this is the correct thread to discuss this, but virtually every DSO manufacturer always specifies maximum wfrm/s using the lowest memory depth possible with dots (not vectors) selected. Of course, it's the fastest speed - so they use the settings that would achieve the fastest speed. --- End quote --- I'm just saying that achieving 30K wfrms/s is not going to be easy unless you can make the memory dept to be around 2.5Kpts in automatic mode. Still 5,000 wfrms/s at 14Kpts is nothing to sneeze at since that is 70 million points per second, at max mem-depth it goes down to 35.5 wfrms/s but that's understandable for 56 Mega points, for 1.988 giga points per second!. At 469,577 bytes per second maximum transfer time via USB/Network to the PC you must loose about 65.5 million points per second on the best scenario. In other words, out of the 5,000 wfrms/s at 14Kpts you can only keep about 36 of those waveforms per second, being optimistic. It wouldn't look that bad, but it's never going to be as good as what you see in the scope screen. |
| markone:
I made some check on waveform capture rate under continuos screen transfer load, what happens is that the "blind time" sometime grows (7.5ms to 25ms) while the capture burst maintain its frequency, around 17 Khz. Useless to say, scope screen on PC monitor is waaay more clearer, not only for size but also due to pixel sharpness and you have visually lots of waveforms in it, way more than what is achievable with waveform data transfer. A pity for the slow rate (3FPS), at 20-30FPS would great. |
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