Hantek 6254BD background noise

wolferl

Received the  Hantek 6254BD two days ago.

Unfortunately the device is not useable at all. There is constant background noise on all channels
shown and can be measured. Does not matter if the input connector is completely open or directly
grounded with an BNC connector.


Did the self-calibration routine several times - no change.

open input, setting at 20mV shows 17.6mVolt background noise
open input, setting at 500mV shows 31.4mVolt background noise
open input, setting at 5V shows 314mVolt background noise

Connected the scope with the probe to the probe compensation connector,
(probe was set to 1:10) shows the noise in the squarewave too.

Is the unit faulty ?

picture: https://drive.google.com/open?id ... LazVVeZpdd6ZlZOIaqk