Hantek DSO8060 DC coupling problem after firmware update
After I updated the firmware in my Hantek DSO8060 handheld oscilloscope meter, the DC coupling for both channels causes an overrange condition even with no signal applied and 0V DC offset set via the front panel controls, but AC coupling works OK. 
I then tried a factory reset without success, and then I tried the automatic recalibration routine which fixed this problem.
In my theory, it appears a newer firmware version uses a different structure for the calibration constants (or updating the firmware has cleared them).
This could also affect other units (Hantek and certain others) too.
I then tried a factory reset without success, and then I tried the automatic recalibration routine which fixed this problem.
In my theory, it appears a newer firmware version uses a different structure for the calibration constants (or updating the firmware has cleared them).
This could also affect other units (Hantek and certain others) too.