Products > Test Equipment
Pocket-Sized 6 GHz 1 TS/s ET Scope
joeqsmith:
With the brightness set to the min, all of the transitions are still buried in the noise. Guessing that the increase in samples per CDF will greatly improve this.
SJL-Instruments:
--- Quote from: joeqsmith on March 07, 2024, 05:00:48 am ---Sorry about the long delay but finally rebuilt the FPGA to further even out the distribution so we can see all of the level state changes. Showing with 40k trigger min/max PAM4 with brightness set to max and something reasonable. Zoomed into the transition area. This was after a few hours of warmup. At 128 pts/div, it took several minutes to collect this data and initially the drift was really messing with the measurements. Big improvement in the noise but is it ever slow.
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To clarify, is this with 40k Triggers/Sample min/max with 100 samples/CDF?
--- Quote from: joeqsmith on March 07, 2024, 05:09:30 am ---With the brightness set to the min, all of the transitions are still buried in the noise. Guessing that the increase in samples per CDF will greatly improve this.
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With 40k triggers/sample, the speckles are likely dominated by CDF quantization noise (will be fixed in v14). Increasing samples per CDF (if below 100) will also help, but 100 should be sufficient for PAM4.
Some updates on v14 firmware: USB DFU is working. We are in the process of offloading more work onto the FPGA for faster acquisition. This is quite a large rewrite, so we will likely spend 2 or more weeks performing stability and regression tests. If all goes well, it should still be on schedule for end of month.
joeqsmith:
--- Quote from: SJL-Instruments on March 07, 2024, 02:55:01 pm ---To clarify, is this with 40k Triggers/Sample min/max with 100 samples/CDF?
--- End quote ---
That is correct.
--- Quote from: SJL-Instruments on March 07, 2024, 02:55:01 pm ---Some updates on v14 firmware: USB DFU is working. We are in the process of offloading more work onto the FPGA for faster acquisition. This is quite a large rewrite, so we will likely spend 2 or more weeks performing stability and regression tests. If all goes well, it should still be on schedule for end of month.
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I am not sure how you define firmware. Can you program both the microcontroller as well as the FPGA over USB with this new version?
I'm up for fastest acquisition. I wouldn't be surprised if those previous plots didn't require an hour to collect one sweep. I suspect some of the smearing (4 men enter, five exit) isn't from the scopes trigger drifting with temperature, shifting time.
SJL-Instruments:
--- Quote from: joeqsmith on March 07, 2024, 06:15:52 pm ---I am not sure how you define firmware. Can you program both the microcontroller as well as the FPGA over USB with this new version?
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Yes, both the FPGA and MCU can be reprogrammed via USB. We will add an "Update Firmware" menu option to the software that will just require selecting a single .bin file. Ideally, should never need to open the case after v14.
--- Quote from: joeqsmith on March 07, 2024, 06:15:52 pm ---I'm up for fastest acquisition. I wouldn't be surprised if those previous plots didn't require an hour to collect one sweep. I suspect some of the smearing (4 men enter, five exit) isn't from the scopes trigger drifting with temperature, shifting time.
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The ideal sweep time can be calculated from Section 2.2.2. Our goal is for v14 firmware to be within 20% of the theoretical minimum across all parameter ranges.
joeqsmith:
Same signals applied to my 20 year old LeCroy waveblunder 64Xi. Gigawave 6GHz, 1TS,12-bit vs the LeCroy's 600MHz, 5GS, 8-bit. Of course, the LeCroy has a faster sweep rate (<sec vs several minutes), but the transitions are also much more discernible. Of course, the 64xi can't show 35ps transitions like the 6400 can.
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Right tool for the job. If you need to measure fast edge, 2-state signals, 6400 really shines.
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Qualify that with MHz trigger rates....
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