Electromagnetic shielding general question

1 electromagnetic shielding is how to produce?
When the lines of magnetic flux encountered when a high permeability material, the magnetic material will be attracted to it, so that the magnetic force will not affect the original target. The most effective electromagnetic shield is closed all around the object, such as a box or cylinder head. A closed magnetic field can only reach the surface of the object, so the object can be enclosed into the inside of the magnetic field to prevent unnecessary electromagnetic interference.
2 magnetic field is produced?
Most of the field is man-made. Solenoids, motors, transformers and so can produce a magnetic field. We can use the magnetic field to produce sound, microscopic images, and can be used to record the resonant electromagnetic resonance technology sub-image In some cases, the magnetic fields can interfere with sensitive electronic equipment, this time we need an electromagnetic shield.
3 What is electromagnetic interference?
Electromagnetic compatibility (EMC) refers to a performance of the electronic device itself, this particular performance enables the electronic equipment from electromagnetic interference and normal operation.
4 Why electromagnetic shielding electromagnetic field needed?
Electromagnetic interference so many designers of electronic products headache. Take our use of mobile phones for example, designers in the design of the phone when taking into account the RF interference, it is necessary to design a device to shield the RF shielding to prevent other electronic devices have an impact on the normal use of mobile phones. Designers might find that the presence of electromagnetic interference between electronic assembly components together, this time you need an electromagnetic shield. When the solenoid associated with a radio frequency interference when electromagnetic shielding is very significant importance because only the shield to ensure the normal operation of electronic equipment.
5 What can stop a magnetic field?
So far, no one material can not be attracted to a magnet, but also to prevent the magnetic field. We can not create or cancel the magnetic field, we can change the direction of the magnetic field. In order to change the direction of the magnetic field, we use a high permeability shielding alloys. These magnetic shielding material will be adsorbed, so that the directions of the magnetic field will change.
6 Why do electromagnetic compatibility?
Although electronic product does not comply with the relevant provisions can not be sold on the market, but there is still some illegal manufacturers, producing some products will affect our lives. These products will affect the normal operation of our health and safety, data processing, security and important electronic devices. If no good electromagnetic shielding, anti-skid braking systems, engine control systems, long distance communication and data transmission, as well as the spread of commercial and military data security will be greatly reduced. There are still some other problems, hazards such as mobile phones and computer screen electromagnetic radiation on health caused by living near high-voltage lines and health risks, etc., which makes us gradually started to pay attention to electromagnetic compatibility. Some problems can be easily controlled, but there are some issues, but will continue to exist. High-intensity electromagnetic pulse generated by a nuclear explosion causes a variety of business communications and data processing instant crash, anti-nuclear cause those non-military networks are instantly stopped.
In other words, it will lead to chaos, we will no communication, no electricity, no television, radio and other media to communicate with the outside world, we would have lost all means of transport.
What are the main causes of 7 electromagnetic interference problem is?
In any case, there is a root cause of the problem and the victims of the problem. Electromagnetic interference is mainly due to our use of electronic devices, when the abrupt change of the voltage or current intensity, so that the electronic device to release the discrete frequency electromagnetic energy. Apart from some natural phenomena, such as atmospheric disturbances and lightning, electromagnetic interference generated by external electromagnetic interference generated by conduction and radiation include: radar and communications transmitter receiver local oscillator engine computer and its peripherals and power lines fluorescent transformer box Welder and a host of other things. . . . .