I can't use the 10M memory,because the trigger is terrible.Just like when I use 10M memory and put the timebase to 20ns/div or 50ns/div,the waveform can't stable at all,like a girl is dancing.
This is very strange. Owon have many lack in features but all what I have tested in lab have been with very good signal capturing quality and very stable trigger (exept external trig, what is very limited due to its different signal pathway)
What is advantage for equal time sampling mode?
If oscilloscope sampling speed is 1GSa/s real time and analog BW is (example 100MHz) what more can see with equal time sampling. Just exatly (nearly) nothing but get very slow result and usable only for full time repetitive signals without nearly any improvement. Only small improvement is (if it is made well) is if measure small time differencies between two repetitive signals becouse it can naturally give more time resolution.
If analog channel is wide related to realtime samplerate then it give lot of advantages and this was original reason for implement it old times to digital scopes. They reeally need this "repetitive" sampling. Of course if 100MHz oscilloscope have 10MSa/s realtime. There is important this "equ-time" ans lot of important (and hyped) old times when memory and samplerates was very limited.
Of course then today it have high advantages in special equipments and highly usable "in right place".
10M memory make possible 1GSa/s up to 500us/div.
If your normal main channel trig have been so bad you tell your oscilloscope propably have been broken. 0.2ns is typical. If is is 2 or 4ns class it is exactly fail exept if you have hidden not visible noise on signal what disturb trigger pathway. But normally it can also see in capture becouse from input to end amplifier output (parallel output) signal pathway is exactly same.
For example SDS7102 model I have real documented lab data so much that if someone tell that it have typically lot of trig jitter I want see data and documents about it and also documents about signal used for testing.
If I find one single unit what main channel trig position jitter is "like dancing girl" I classify this single unit "fail" (back to factory or warranty repair/change)
I know one very old manufature lot of SDS8xxx what really have this fail in trigger. These factory have refunded (probably HW problem becouse no any help after factory first try some FW patches). These are now in garbage collection in my lab waiting possible return to factory or waiting use as spare part source for displays or front panels or power supply etc... )
But it have pros and cons.
But good question is: is is apple to apple compare if take Rigol 2000 series and Owon SDS. My answer is not.
Slidded (windowed) mode. It is nice but some scopes seems work so that it use same sampling rate in zoomed part. Pity.