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| Rigol 1054z and 1074z timing problems at 500ms timescale and 24M memory depth |
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| Sredni:
Is this a known bug? https://electronics.stackexchange.com/questions/517690/rigol-ds1074-oscilloscope-shows-very-wrong-timing Basically, acquisition at 500ms timescale with memory depth set to 24M gives timing results consistently 4% off. I wanted to post it in the rigol megathread, but I can't find it. EDIT: I finally found the Rigol megathread and posted there as well to alert all posters there of the issue. |
| Howardlong:
--- Quote from: Sredni on August 21, 2020, 11:00:32 pm ---Is this a known bug? https://electronics.stackexchange.com/questions/517690/rigol-ds1074-oscilloscope-shows-very-wrong-timing Basically, acquisition at 500ms timescale with memory depth set to 24M gives timing results consistently 4% off. I wanted to post it in the rigol megatrhead, but I can't find it. --- End quote --- I don't know if it's a known bug, but it seems to be that capturing at 4.00MSa/s ain't right (500ms/div, single channel, 24MSa). On mine, a 1Hz square wave calculates as 961mHz, and you can see it's not right. Recaptured at 200ms/div and 1s/div looks fine. |
| tautech:
--- Quote from: Howardlong on August 22, 2020, 09:28:42 pm ---I don't know if it's a known bug, but it seems to be that capturing at 4.00MSa/s ain't right (500ms/div, single channel, 24MSa). --- End quote --- Welcome to the world of DSO memory/sampling rate management. Looks as it should do to me......apart from the counter. |
| Sredni:
After posting here, I did some other test using the 1kHz test signal and the 4% error is there and is reproducible. Just acquire it with 24M with a 500ms timebase and the period will be 1.040 ms instead of 1.000 ms. And if the acquisition is done with a 5s timebase, the period will come out as 800us, a 20% error. (images at the updated link above) |
| Howardlong:
--- Quote from: tautech on August 22, 2020, 09:47:30 pm --- --- Quote from: Howardlong on August 22, 2020, 09:28:42 pm ---I don't know if it's a known bug, but it seems to be that capturing at 4.00MSa/s ain't right (500ms/div, single channel, 24MSa). --- End quote --- Welcome to the world of DSO memory/sampling rate management. Looks as it should do to me......apart from the counter. --- End quote --- It's not aligned with the graticule. |
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