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cable, black line is the instrument work ground, should be independently reliable
grounding. To ensure that the signal is transmitted in a one-way and reliable way in
the circuit, it is required to disconnect the target cable at least.
At one end of the ground, the signal is sent back through the earth in an indirect or
capacitive loop, as shown in the figure.
Direct method using the direct transmission signal cable, transmission attenuation is
small, strong signal, transmission, is the best way to signal, suitable for any kind of
signal transmission, is the preferred method of the test.
(2) Coupling method
The transmitter's signal is applied to the target cable by coupling pliers, that is, the
coupling is legal. In order to ensure that the coupling signals can be transmitted
reliably in the circuit, the clamps must be closed completely, and the ends of the cable
must have contact points related to the ground, as shown in the figure.
The coupling of cable to signal intensity is directly related to the frequency of signal,
the frequency is low coupled with weak, and the frequency is highly coupled.
Sometimes it is also related to whether the line is running or not. In the same
frequency, the running cable is stronger than the signal being coupled to the
non-running cable. Therefore, the coupling method is especially suitable for the
charged path and the charged identification.
(3) Induction method