I have to measure DC voltage using 7175-2 pseudo-differentially over 1-2 m wires. In order to avoid any voltage drop in wires the built in input buffers would be enabled, thus there almost no current flow. I expect the wires to catch significant common mode noise from RF to 50 Hz power grid.
Most materials about common mode noise that I found, consider it in the context of power line that involve common-mode chokes. However, I am not sure if this is suitable for my measurement.
Also there are conventional common mode RC filters, but I am not sure if they will be good enough
Which else possibilities are there to suppress common mode noise, and what is the best method for a measurement application?