The conditions that must be present to produce electromagnetic interference are: electromagnetic radiation source, sufficient energy, frequency and amplitude, sensitive equipment, physical transmission medium.
1, the source of electromagnetic radiation
The generation of electromagnetic interference requires the existence of a source of electromagnetic radiation, which can be any electronic device or system, such as communications equipment, radio equipment, power equipment, electronic equipment. These devices generate electromagnetic radiation, including radiation in the form of electromagnetic waves, electromagnetic fields, or electromagnetic pulses, when they are in operation.
2. Sufficient energy
The source of electromagnetic radiation needs to have enough energy to produce electromagnetic fields or waves of sufficient strength. A radiation source with sufficiently strong energy can interfere with other equipment or systems at a certain distance.
3, frequency and amplitude
Frequency and amplitude of the source of electromagnetic radiation is also an important condition of interference. Different frequencies and amplitudes of electromagnetic radiation will have different degrees of impact on different equipment or systems. For example, the frequency bands commonly used for wireless communication devices are 2.4 GHz and 5 GHz, while other devices may operate in different frequency bands.
4, sensitive equipment
Electromagnetic radiation sources need to affect some sensitive equipment or systems, such as wireless communication equipment, radar systems, medical equipment. These devices are more sensitive to external electromagnetic signals, can be affected by the interference signal, resulting in performance degradation or functional failure.
5, physical transmission media
Electromagnetic radiation needs to be transmitted through certain physical transmission media, such as air, wires, electromagnetic waves. Interference signals will be transmitted to sensitive equipment through the propagation medium, thus affecting its normal operation.
Electromagnetic Compatibility (EMC):
Electromagnetic compatibility refers to the ability of an electronic device to function properly in a given environment without causing irreversible damage to surrounding equipment or systems. Surrounding equipment or system to produce a non-peg hole accepted interference. It includes two aspects: anti-interference and radiation resistance. Anti-interference refers to the equipment can maintain normal operation under the interference of external electromagnetic fields, while radiation resistance refers to the equipment itself will not produce too much electromagnetic radiation interference with other equipment.
In order to ensure the electromagnetic compatibility of electronic equipment, there are a number of standards and which spring norms are widely used, such as the International Electrotechnical Commission (IEC) electromagnetic compatibility standards series (such as the IEC 61000 series), the U.S. Federal Communications Commission (FCC) regulations, the European Telecommunications Standards Institute (ETSI) requirements.
These standards specify the electromagnetic radiation and immunity requirements that equipment should meet in order to safeguard the normal operation of the equipment and to ensure that there is no interference with other equipment.