Difference between channels in vertical measurement MSO5074

[Magnum]

Hi,
received a MSO5074 today. A stupid question: Feeding a 4Vpp Square Wave to all channels (one after the other), the DVM reads between 2.00 and 2.04 V RMS. Also visible on the waves. I know that DSOs are not very accurate in vertical measurements, but I did not expect differences between the channels. Is that normal or a calibration problem? I have firmware 00.01.04.04 which seems to have problems with autocal.

[Magnum]

Just found out it seems to be normal. When resizing the wave form a bit (with fine controls) it goes up and down on all channels about 0.03V. But still within the stated 3% accuracy.

[thm_w]

Yeah thats fine as you said.
4Vpp would likely imply a 1V/div setting on the vertical scale or more (8*1V visible on the screen, 10V total). 3% of 10V is 300mV.

You can try running calibration if you like, see if it makes any difference.