Additional protective devices
Electronics shields

In the title of this chapter 6 , phrasal “protective devices” involves component or topology, improving the shielding effectiveness of electronic equipment, however, such device don’t behave like a topological barrier. Let’s suppose that ground contact 6a is removed, thus, current I_B diverted through the cable shield, falls strongly, and the shielding effectiveness is well better that was under initial topology. Let’s imagine now, that cable shielding opened at end 6a, is submitted to a very high frequency EM field interference, resonance of this cable may occur by increase studently...