Three introductions to electromagnetic radiation Tester (EMR)
1. Overview of EMF Meter
Electromagnetic waves are generated by the changing electric field generated by the movement of charges in a conductor, which in turn forms a magnetic field. The electric field and magnetic field propagate outward through a path, forming electromagnetic waves. Electromagnetic waves have different frequencies. From an energy perspective, electromagnetic waves are composed of electrical energy and magnetic energy.
Electromagnetic radiation usually refers to electromagnetic waves propagating through space. The frequency range (spectrum) of electromagnetic radiation is very broad, including common radio frequencies such as shortwave, microwave, infrared, visible light, and ultraviolet light.
2. The generation of electromagnetic waves
Maxwell's electromagnetic field theory states that a non-uniform electric field generates a changing magnetic field in its surrounding space, which in turn generates a changing electric field. The two depend on each other, excite each other, alternate, and propagate at a certain speed from near to far, forming electromagnetic waves.
When the frequency of electromagnetic waves is low, they are mainly transmitted through tangible conductors, that is, through conduction and propagation. When it has a certain high frequency, electromagnetic waves can clearly propagate through space, that is, electromagnetic radiation. It can be seen here that the transmission distance of electromagnetic waves in space varies with different frequencies.
The characteristics of electromagnetic radiation determine that we need to utilize it in some places and avoid it in other situations, such as wireless communication. For example, electromagnetic radiation can cause issues such as crosstalk and electromagnetic compatibility (EMC) in electronic systems, and some can also cause damage to human health or the environment.
3. EMC considerations in electronic product design
The transmission lines on PCBs, especially high-speed signal lines, generate electromagnetic radiation and are also affected by electromagnetic radiation interference in the environment. This kind of interaction interference interferes with the normal operation of the system, and in severe cases can lead to system malfunction, failure, and even collapse, often causing damage to the environment. Therefore, electromagnetic interference issues must be carefully considered in electronic products. High precision: The electromagnetic radiation detector has high-precision measurement capabilities, which can provide accurate measurement results and help users evaluate the radiation environment and locate radiation sources.
