signal cable / RF / coaxial / low-noise

Coaxial cable is sometimes used for temporary or portable applications. Coaxial cable should never be used in permanent installations through conduit or other enclosed cable runs where the cable must be pulled. If the cable jacket insulation is ever pulled off, the shield can contact 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.