VM205 diagram and use of RV1

Would it be possible to obtain the diagram of the VM205 oscilloscope card.
And does anyone know the usage of RV1.
Thank you and good day.

Hello @Hebus ,

The RV1 is for calibration => DC Adjust “gain”.
In principle, this should not be adjusted, since RV1 was adjusted from the factory during the test procedure.

Circuit diagram can be downloaded from here:

Best Regards,
Velleman Support

Thank you for your speed and your response.
Good day to you.
Best Regards.