Electrostatic and inductive interference signals or charges may cause adverse effects to an electronic system. These unwanted signals can be captured by using a shield. A shield is a good isolator and it isolates the signal from interference signals. Noise signal originates in a conductor/transducer/operational amplifier system. In electrostatic shielding, a shield is designed in such a way that it covers the signal conductors. It isolates the signal conductors from the noise interference signals or charges. Draining of charges occurs through the connections. Ferromagnetic materials are used for making shields, if we have to eliminate electromagnetic interference. This is called magnetic shielding. Magnetic shielding introduces high permeability region which block magnetically induced noises. Other devices used to block noises are twisted conductors, wrapped foil shields and grounding drain wires.
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