Small add. (FRom other thread. This thread is better for this because scope is SDS1000X-E 4 channel version.)
About XY mode. FW ...25R2
Here two images.
Other with AM (noise) mod and other without. Just for somehow imagine intensity grad. (not at all best example)
Also need note that live image looks bit more smooth than still image. (human eye/brain effect)
IN XY mode it can still also push these single XY´s to wfm history buffer.
It is easy to see how many there is and looking time stamps how much time it take and also there is interval.
Siglent do not directly plot XY. It capture both traces and then construct XY display from these. But after this process this product is pushed to wfm history buffer fifo.
Both traces are captured using current memory length in use and using current samplerate.
This make possible all automatic measurements. Including of course freq, rise time etc... just all.
Also Trigger functions available in XY mode.
But as all, also this have advantages and disadvantages. Method used in Siglent is not so easy to use as is direct XY draw. With pure direct XY draw just connect signal and adjust X and Y axis V/div. No need care memory and time scale. It works like analog scope, exept of course mostly more slow and "rough" trace.
What ever method digital scope use, if it have 8 bit ADC there is ADC itself noise and analog front end noise. X and Y vector have max 256 levels and now both have noise so every XY vector plot is not at all 1x1 pixel or 2x2 pixel on the TFT screen. It looks rough if compare old analog scope.
Siglent principle for XY is same as in Yt mode. Exept that Yt is only intermediate product. After they are ready, from these two parallel Yt captures it forms an XY image. Think sinewaves in both channels.
First both channels capture sinewave. If sinewaves have 90 degree phase shift you see circle in XY display.
And now important: If this Yt capture do not contain least one full cycle what happen. Now we can see only circle arc part. And more fun. If this Yt capture is well triggered this circle arc part position is fixed.
Now if we loose trig this circle arc part position is "random". Now we can do longer time Xt captures so that it have least one cycle and circle is full. Just rise t/div. Depending current timebase you can also control current samplerate adjusting memory data length if it is possible with current other settings.
If you are not sure how it looks in Xt display just change to YT mode and look. After some experience together with knowledge about principle you can easy control these things without swap between YT and XY mode (XY on/off) for optimum display with current signals.
Just forget how analog scope work or digital scope with plain XY plot... Siglent XY mode used principle need you control both channels V/div as always need with all kind of XY. But then you need also control bacround of XY working Xt capture length using t/div. Also you adjust trigger least if need do time dependent measurements. Also in some cases it may be useful manually set memory upper limit for reduce samplerate. Specially with some low freq signals it may give more nice image reducing trace fatness (kind of noise limiter).
It may feel complex but in praactice, exercise with some examples using true signals it can fast understand basic principles of settings and after then you may get much more than with simple XY method.
Also, even with XY mode waveform history buffer is in use. You can stop and play back and look every single XY based to every single XT capture. In this case buffer include these XY frames and not these original YT captures behind these XY products.
- Trigged or untrigged XY
- Full measurements (using X and Y channels not displayed Yt acquisitions)
- intensity gradation
- History max 29140 single XY frames. (100ns/div)
- Up to >60000 wfm/s (this max measured using 1MHz CH1 and CH2, 100ns/s, trig: rising edge, no automatic measurements, acq mode: normal, fast. Cursors X-Y on. Currently in use Yt memory length 700pts) If timebase is 100us/div and current used length 700k it can 100wfm/s and max history buffer las 38 XY's
With these settings in images it have around 8400wfm/s.
Of course this is not display refresh speed. It is roughly 25frame/s (same as in all modes)
As in normal Yt mode all captures what are made in one TFT perioare overlaid in this TFT frame and produced intensity gradation.
As in Yt mode wfm/s speed depends many settings.
Also tested using 100ns and 500MSa current memory length is 700pts and this can reach bit over 60kwfm/s speed if measurements also off. Tested using 6MHz signals. Persist and cursors do not affect.
Wit this setup max history buffer is max 29140 XY last products. Of course all these individual XY's can look separately or play in history buffer.
No image, looks around as these others.
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