I recently bought the EDU09 Oscilloscope kit from Velleman. The calibration process works fine, but there seems to be a DC output offset.
When connecting a 10V DC source, the oscilloscope measures a voltage just below 5V. Also, when connecting the probes to a 1.5V battery, to perform the advanced calibration, I was only able to adjust the DC mean between -0.2V and 0.2V.
Voltages on IC2 and IC3 correspond to voltages already mentioned on the forum.
Can someone help me with this issue.
Thanks in advance.