EMC testingAlso known as electromagnetic compatibility (EMC), it refers to the size impact of electronic products on the electromagnetic field level（EMI）The comprehensive evaluation of anti-interference capability (EMS) is one of the important indicators of a product, and electromagnetic compatibility measurement consists of a testing site and testing instruments. The purpose of EMC testing is to examine the effects of electromagnetic radiation on electrical products such as the human body and public power grids.

Electromagnetic CompatibilityIt is a discipline that studies the coexistence of various electrical devices (including biology) under limited space, time, and spectral resource conditions without causing degradation. It includes electromagnetic effects andElectromagnetic sensitivityThere are two types of electromagnetic impact testing, which measures the magnitude of electromagnetic wave signals and reflects their impact on surrounding electronic products. Electromagnetic sensitivity testing is the measurement of the anti-interference ability of the tested equipment to electromagnetic interference. Electromagnetic effects mainly include radiation transmission and transmission transmission.

What is the average EMC test pass rate for electronic products?

There are few statistical data on this topic because EMC testing laboratories and the government do not need to organize information. However, one of the large-scale studies provided by the world-renowned TUV testing center had an initial compliance rate of only 50%! Malfunctions can easily take several days to months to go to market, so it is important to be prepared for EMC testing. In this guide, I will provide a detailed explanation of the preparation process and the level of EMC design and pre compliance testing that you should consider.

Must pay attention toEMC testingIs that okay?

Although there are some exemptions, if you design, manufacture, or import products containing electronic products, it is almost certain that you need to pay attention to EMC.

What should be paid attention to in EMC testing of electronic products?

1. Maintainelectromagnetic spectrum

We only have a limited electromagnetic spectrum that can be used forWireless transmissionMicrowave communication, X-ray machines, and many other products. Unfortunately, even electronic products without emitters can emit electromagnetic radiation, just like the inherent switch current and voltage byproducts of electronic circuits. The electromagnetic spectrum may be adversely affected, and the frequency band reserved for radio transmission may be damaged, without limiting the non estimated electromagnetic radiation from electronic products. With the continuous explosion of non wireless and wireless products, the already crowded electromagnetic spectrum will become even more crowded. Maintaining this critical resource is particularly important to ensure that the equipment continues to operate normally in the future.

2. Safety

For many products and industries, EMC performance may represent the difference between life and death. Many diagnostic and therapeutic, defense, industrial, aerospace, and automotive products (as well as other products) have critical safety applications. If the functionality of these products is ineffective due to electromagnetic conditions such as electromagnetic surges, ESD, or radiated electric fields, then life will be in danger. Imagine 300 mobile phones transmitting 7 watts of power on a 36000 inch airplane - this is a rigorous EMC test to ensure that the electrical system can withstand various electromagnetic environments.

3. Product performance (quality)

The functionality and performance of electronic products are easily affected by external and internal factors, and the phenomenon of EMC poses a threat. For example, if the internal power supply is adjusted too much, it will have adverse effects on sensitive analog measurements (for sensor products) or reduce the performance of wireless transmitters (for wireless products). This is an example of an internal EMC challenge. From an external perspective, the application of EMC will have almost endless adverse effects on the product, from data destruction to measurement accuracy, and then to the performance IC after RF frying.EMC testingHelps ensure that your machine is in a typical state of EMC in the environment, running as expected again, and (expected) reducing the level of poor EMC performance of the product.