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I don't think you got a defected unit, the huge offset error in oscilloscope mode is normal to this device, mine has this "feature" as well. You will notice that the level of the offset changes with the vertical scale selected, if you turn on or off the second channel or when you connect the device to a charger or USB port. I think I already reported it to Hantek but I never got a response.
Let the device on warming up for a few minutes then try to run the self calibration with it plugged on a USB port of a computer, for me it sometimes helped a bit.
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Post time 2019-8-12 01:56:04