First, I have to say that I am overall impressed with the product.
It surely has some downs, one of them being the analog BW stated vs. actual, but for the given price I think we can live with it.
I did some simple testing at 1KHz square wave and 31kHz square wave.
One needs to know that the probes that come with the unit are not compensated. After quick schematic review I figured out that C3A and C5A adjust compensation for channel A, and C4A and C6A for channel B. These trimmer caps are accessible under the battery, btw.
The pictures show the 31kHz signal before and after compensation adjustment. The edges are little round as the actual signal was having them slightly round (verified w/ my bench Tektronix).
For best results use polymer screwdriver to adjust.
