Hi Guys,
I noticed that channels 1, 2 & 3 on my Siglent SDS1104X-E behaves at least strange. When powered on everything to work +/-OK, but after few minutes DC offset of channels 1-3 start to rise from ~0mV to more than 2mV, which makes traces to render out of the screen (500uV/div, AC coupling, nothing connected)! It is interesting that with DC coupling enabled traces are off zero, but not as much as when AC coupling is enabled, also adding 50ohm termination in DC mode influences channel offset (it starts to be positive instead of negative).
Interesting thing is that channel 4 i almost OK, drifts only a bit over time and DC is at almost same level as AC...
Everything was disconnected from BNC inputs; self-calibration was done several times (and had no impact on channel offsets).
I've attached 2 images of channel 1&3 in AC coupling taken 25 sec. and 4:40 after power on.
Do you have same issue, any clue how to fix it? Or this is "standard feature" for Siglent SDS1104X-E...
best regards
Mikolaj