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| Siglent - 11/20 - New SDS1104X-U, 4 channel 100MHz, 1Gsa/s economy oscilloscope |
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| tautech:
--- Quote from: QuitButton on June 19, 2021, 04:57:29 pm ---Can someone confirm what I'm seeing here isn't me going bonkers and its just "how things are"? Siglent give me this sort of display tt the same timebase: --- End quote --- --- Quote from: bdunham7 on June 19, 2021, 05:31:48 pm ---If you have more dots than mathematically possible during a single capture, the scope is overlaying multiple captures. --- End quote --- --- Quote from: tttonyyy on June 19, 2021, 06:27:29 pm ---If you single trigger the scope you'll see the true reflection of number of sample points on screen. --- End quote --- Both these ^^ However it's evident QuitButton's capture was manually instigated whereas if it was done with a Single trigger one sample point will be aligned with both the horizontal and vertical trigger points. |
| bdunham7:
--- Quote from: tautech on June 19, 2021, 08:29:18 pm ---However it's evident QuitButton's capture was manually instigated whereas if it was done with a Single trigger one sample point will be aligned with both the horizontal and vertical trigger points. --- End quote --- I believe that is not true--and with an interpolated trigger where the trigger does not in any way control the sampling clock, how could it be true? I'm not sure what you mean by 'manually instigated', but you can see that there are two dots that when interpolated by sin(x)/x would plausibly be right at the trigger point, but there's no sample there. |
| tautech:
--- Quote from: bdunham7 on June 19, 2021, 09:19:09 pm --- --- Quote from: tautech on June 19, 2021, 08:29:18 pm ---However it's evident QuitButton's capture was manually instigated whereas if it was done with a Single trigger one sample point will be aligned with both the horizontal and vertical trigger points. --- End quote --- I believe that is not true--and with an interpolated trigger where the trigger does not in any way control the sampling clock, how could it be true? I'm not sure what you mean by 'manually instigated', but you can see that there are two dots that when interpolated by sin(x)/x would plausibly be right at the trigger point, but there's no sample there. --- End quote --- Run/Stop vs Single. |
| bdunham7:
--- Quote from: tautech on June 19, 2021, 09:25:45 pm ---Run/Stop vs Single. --- End quote --- The only difference I see between Run/Stop and Single is that the segmented mode only works in Single. Either way, at 1ns/div I get 1 sample per division (except with segmented mode I get multiples at random locations relative to each other) and the samples can be anywhere. |
| tttonyyy:
I'd not really thought about this before. I would guess that the scope firmware just sees that two successive samples cross the trigger threshold, and linearly (or sin(X)/X) interpolates where that crossing point would be in time and shifts the display of all sample positions appropriately to make the zero point line up like we see above. |
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