signal cable / coaxial / shielded

Coaxial cable is often used for temporary or portable applications. It should never be used in permanent installations through conduit or other enclosed cable runs where the cable might be pulled. If the cable jacket insulation is pulled off, the shield could come in contact with a piece of grounded conduit or tray and will immediately cause a ground loop. Since the coaxial shield is actually part of the sensing circuit, the noise pickup in the vibration measurement equipment will be severe. The most prominent frequency picked up will be the power line frequency and it will likely swamp the vibration signal and render all data as useless.