I am aware of the limitations of this kind of product, but I am going to buy either hantek 6022B or DDS140,or DDS 120. I am aware of tehnical specifications (by wich dds140 is the best from these 3 Products)
A couple of months ago I thought exactly the same direction
Some words to the trigger.
Sadly it's not very stable as I'm used in former times with my old analog Hameg.
Nevertheless it's usable for timebase > 1 us, on shorter base the signal is runnin' thru..
CH2 can only be triggered together with CH1, a lonely CH2 is running to Mars.
I do not think, the external trigger will change anything, it's just another base.
I guess that the module s only an enclosure for the two lines.
Have a look on my oics above, they are connected to pins 1 and 4 on the bottom row.
You can stick to with a Dupont jumper.
Sometimes CH2 is very noisy, until now I couldn't evaluate the reasons.
The greatest disadvantages IMHO are the input dividers..
The max. possible positive voltage is ~6V, the max neg. voltage (DC) sometimes 1.6 V, sometimes 3.6 V, max possible neg. voltage AC ~5V.
Result: At logic level you need an external 1/10 divider.
My reason for buying were the 200MSa, 'cause I wanted a "real" 20 MHz scope.
If you can live with an absolutely shitty software you can work with.