Coaxial cables must have proper continuity for optimum operation. Ideally, coaxial cables possess a 75-ohm impedance from one end to the other. A flaw or internal break in either the internal shielding or the connectors reduces continuity. Using a multimeter is a fast way to determine any continuity problems on a suspect coaxial cable.
Turn the dial on the multimeter to the "CONT" (continuity) setting.
Bring the ends of the coaxial cable close enough together to allow the leads on the multimeter to reach them.
Touch the red lead wire in the multimeter to the outer shell of one end of the coaxial connection. Touch the black lead to the centre conductor pin at the other end.
Listen for a tone from the multimeter. A tone indicates a problem in the wire. This may be a break in a shield or the centre conductor touching another metal element in the coaxial cable.