Is the Front USB actually connected to the PCB? (the Atten ATF20B wasn't)
The front USB port is fully operational and can be saved parameters, waveforms created, update firmware and various functions more.
The rear port is for connecting to a PC and use the software (i do not have this software) and create waveforms. The computer recognizes it as an oscilloscope.
How does it react, is the output clean in low and high settings?
The output looks very clean on the high and low impedance, I do not have spectrum analyzer to determine parameters of IMD.
I think its price is pretty good. but the chassis seems to be made with a hammer and an anvil.
Attached some pictures of the different waveforms taken with my cheap scope.
sorry for my bad english, not is my native language.
best regards