Figure 4 indicates the situation that occurs when an electrostatic shield is installed around the signal wires.
Coax cable noise tester.
When it finds the coaxial cable inside the wall it will generate a loud noise and you can easily identify the location of the cable.
If one of the signal wires and the shield are tied to the earth at one point which ensures that the shield and the signal wires are at an identical.
Maybe a flash light will work.
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Don t have a multi meter to test it.
The currents generated by the noise voltages prefer to flow down the lower impedance path of the shield rather than the signal wires.
Best tip on how to trace and test coaxial cable to perform a tracing and testing of a coaxial cable you can use some branded and standard tool to make your task easy and quick.