We are building an instrument that goes deep underground and is connected to the surface with a long cable. Due to the length of the cable and distance between the control station and instrument we are worried about EMF and grounding causing signal disruption. We have already had problems with the magnetometer picking up stray magnetic fields from signal and power wires. In addition everything including instruments, microcontrollers, and cable is set on the same ground and we don't know if that's a good idea.
Does anybody know how to properly ground a large circuit and shield wires from stray EMF?
Does anybody know how to properly ground a large circuit and shield wires from stray EMF?