Hi @attila,
Here's my calibration values. I reverted to factory calibration settings, which appear to be the same. I also tried zeroing everything and running a fresh cal, however encountered an error (same as when calibrating with factory settings) in which the oscilloscope reads an amplified voltage when calibrating. Verified W1 and W2 outputs to be ~3.4V (true RMS) when set at 5V.