And more problems...
This Rigol individual unit what I tried to use for measure signal generator period jittter, testing was failed in just first steps when I try use Rigol DS1074Z (and this individual unit do not have at all this special "5us" jitter. But have Trigger AC coupling jitter.)
This jitter what I hit is continuously over all delay settings and clearly visible after around 50us delay and its jitter p-p rise until around 100us it is maximum and then if more delay it stay around this jitter p-p level. But also if delay is more, say several ms then there is also this fast jitter but also more and more slow drifting around.
Trigger delay jitter.
I have tried measure signal generator cycle to cycle jitter. (yes not only try, also done but I find that with cheap scope measurement/test is impossible. Test turns to opposite and may ask is this device under test or test equipment itself who is tested?
Here picked up from test some tiny example. This is not fair compare due to fact these are in different price category, so it is not apples to apples.
Both oscilloscopes tested with equal signal (Rigol did not have 50 ohm input so I use external terminator for both scopes. Rigol this model can not use faster than 5ns/div, so I use same with Siglent.
(note also that pictures are same size on your monitor due to same pixel count (800x480) but Siglent have 8" and Rigol 7" TFT.)
So, signal period time 300us (no matteer, it do it with all delay settings but under 100us delay, less and less and with some 10-30us delay it go so small that difficult to see with eyes).
Looked next rising edge fron trigger position. (300us delay)
Both scopes DC coupled, Trigger DC coupled and trig mode rising edge middle of signal vertical (0V). Trigger mode normal.
With example 100us delay 20ppm jitter.... With this individual DS1000Z scope can not measure even very crap class function generator signal period jitter.
There is really something wrong and badly.
Note If you look noise that Rigol is under 1/3 BW compared to this Siglent. More BW more noise. This is Basic fundamental - normally.
Rigol show original signal first so that it can imagine what is going on. Then next pictures zoomed to horizontal center (300us delay)
Lot of jitter. Now if you do not have other scope etc ypu may think that signal generator have this over 2ns jitter over one period. This is cheap and totally unusable for this work.
Lets take other tool...
This is acceptable. Siglent have good quality true digital side trigger engine.
And more for some imagine about performance... delay rised to 10ms.
(now we can also see it really slows scope waveform update rate (and trigger freq counter) because delay force scope waiting, every turn it need wait next trig + 10ms delay. Waveform update rate drops of course. (for this I turn it to dots and long persistence so that can see last capture(s), bright dots, and then persistence (old traces)...
What I can say - least I can say: "Not bad".
But with DS1000Z characterizing DUT period jitter. Can not do at all due to its own really terrible delay jitter.
What is this whole jitter hassle.
There is trigger AC coupling totally bad jitter, there is "5us" delay jitter (but this my unit do not have it with any detactaable level), there is this other kind of trigger delay jitter... if Rigol do not know but oscilloscopes are time domain analyze tools... time domain need be as good as possible and trigger stability is one of most important thing in oscilloscope. Now it looks like cosmetic signal make-up is more important than Basic oscilloscope Fundamentals.
Do we now get individual FW patches for every individual scopes... or is it more wise to call back all bad units and change/fix HW so that all can use same FW. Rigol need think what is price for reputation.