Protective Barrier
Protective barriers prevent unwanted electromagnetic interference from affecting the performance of sensitive electronic circuits. Stray emi shielding utilizes conductive or magnetic materials to block radiated signals and noise. This isolation is only effective when the shield is correctly grounded to the system reference point.
Interference Attenuation
Enclosures made from aluminum or steel provide a Faraday cage to reflect or absorb incoming waves. Effective stray emi shielding requires a continuous conductive path with no large openings or gaps. Gaskets and conductive tapes are used to seal joints between different parts of the housing.
This isolation is necessary for maintaining the accuracy of low voltage sensors in noisy industrial environments.
Material Selection
The choice of shielding depends on the frequency of the interference and the source of the noise. Magnetic fields require high permeability materials like mu metal, while electric fields are blocked by high conductivity metals. Every stray emi shielding design must balance the weight and cost against the required decibel reduction.
Testing is performed in a controlled environment using a signal generator and a receiving antenna.
Production Verification
Quality control involves measuring the shielding effectiveness at several key frequencies. The stray emi shielding is inspected for mechanical integrity and the quality of the electrical contact at the seams.
