Is there a way to filter out the ac and just show the dc?
Sure.
First, where are your probes referenced to ?
Is it 0V on the servo drives ?
Is this point the same as mains Ground ie. the same as the BNC's on the scope ?
It really
must be at the same potential in order not to create a ground loop and have potentially damaging currents pass through the probe reference (GND) leads and the scope.
Important ^
Above all ^ satisfied, let's just use a single channel to keep things simple.
Check probe attenuation switch and channel settings are both 10x.
Set this one channel to DC coupling and V/div to 1V. ( Ch3 in your pic is in Fine V/div mode....Select that channel and re-press the V/div button to return to Coarse V/div steps mode.)
20 MHz BW limit ON is OK for this job.
@ 500ms/div you're into auto Roll mode territory and you can chose to turn that OFF with a press of the Roll mode button.
Trigger level needs be comfortably above 0V, if you have a waveform you can set the level to 50% with a press of the Trigger Level encoder.
Try all that and give us a screenshot with your results.
Screenshots to USB with an appropriate menu displayed are easy with a press of the blue Print button and then you can attach the PNG file to a post using the Attachment feature below the text entry box.
If you get all out of shape with the scope settings you can get them sorted with Default.....that you can also customize Default to return to your favorite settings....investigate this when you know the scope a little better.