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| Pocket-Sized 6 GHz 1 TS/s ET Scope |
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| joeqsmith:
Using above method with previous setup does indeed even out the speckles. Interesting the speckles are constrained within the signals max/min voltage levels. I like these little insider snippets of what is going on. When using a scope, no one is going to expect to see the spotted plague. IMO, because it is such a deviation from the norm, I would dedicate a section of the manual to explain why they are present, proper brightness adjustment, maybe include your previous post.... I assume the original work around was limiting the brightness, which created the other problems we have gone over. While I can trim the brightness to remove all the speckles, I loose information at the switch points. It's a tradeoff that I don't like. Could some of that fancy dancy math of yours resolve the speckles at any brightness level? |
| SJL-Instruments:
--- Quote from: joeqsmith on February 28, 2024, 02:30:39 pm ---I like these little insider snippets of what is going on. When using a scope, no one is going to expect to see the spotted plague. IMO, because it is such a deviation from the norm, I would dedicate a section of the manual to explain why they are present, proper brightness adjustment, maybe include your previous post.... --- End quote --- We will include all this information in the next manual revision. Eventually we'd like to turn this into a video with clear visuals. --- Quote from: joeqsmith on February 28, 2024, 02:30:39 pm ---I assume the original work around was limiting the brightness, which created the other problems we have gone over. While I can trim the brightness to remove all the speckles, I loose information at the switch points. It's a tradeoff that I don't like. Could some of that fancy dancy math of yours resolve the speckles at any brightness level? --- End quote --- The residual noise after clipping the hidden channels is largely due to the 256-level quantization of the CDF levels. This will be resolved by v14 firmware which will allow a 16-bit CDF return format. If you bump the Nmin above 30k, the fallback to the direct CDF read mode will allow for higher CDF resolution (but will be horribly slow due to communication overhead). But this will give you a sense of what will be possible with v14. There are fancier ways to reduce the speckles. Assuming temporal coherence, you can apply a Bayesian filter to improve the prior distribution for each subsequent acquisition. In plain terms, you can compare neighboring times with the assumption that the data should be similar to remove outliers. This should improve the situation significantly, but only works at high timebase resolutions. We'll see how well this works. |
| SJL-Instruments:
Shahriar has just posted his review of the scope - linked below. We left a comment with some responses, but it seems to have been blocked for now - hopefully it will get through soon. Now posted. |
| hpw:
Looking at 15:50 as Jitter-1.png and I would say this a must have for any OXCO clock or clock distribution to test as on AUDIO gear. While most relay on PN given figures, as those used PN measurement gear measured simple the filtered sine signal of the square wave. In the digital world, any 10..90 or 20..80% rise/fall variations are of any interests. So I would like: - to measure digital 3.3..5V references signals given form OXCO or clock distributions as in the range of 5...100MHz - this means, an internal or external accurate reference is needed. while the DUT PN OXCO is about -120 rtHz @ 1Hz or even lower - this requires a high impedance differential connection/probe to the DUT - also to measure any ripple of the analog/digital power on ADC/DAC as on VRef - a Histogram would tell, all or use any pricey LeCroy gear with Jitter SW IMHO the picture tells all but do not convince me, whether we measure the DUT jitter or internal used TXCO reference jitter. Just my 2 cents Hp |
| ddavidebor:
Hi SJL-Instruments ! My name is David and I'm responsible for all of the electronics engineering at https://thinksmartbox.com/ We design custom tablet computers for people with disabilities. I would like some help to understand if your device can be used for USB SI testing up to USB 3 Gen 2 (10gbit). I admit I'm not that familiar to problems in the GHz range. Here's a quick summary of the test specs, compiled by R&S https://www.rohde-schwarz.taipei/data/activity/file/1644474550064631375.pdf My questions are: - Are you familiar with the standard? have you ever tried anything like this, or do you have customers that have done it? - Can your device meet the requirements for USB 3 Gen 1 (5gbit) ? - Can your device meet the requirements for USB 3 Gen 2 (10gbit) ? |
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