EMI electromagnetic interference testing items in EMC testing

Date：2024-02-02 11:14:31Views：83

EMC issues mainly include two aspects: electromagnetic interference (EMI) and electromagnetic tolerance (EMS). EMI refers to the phenomenon in which electronic devices are disturbed in the normal operation of other devices due to the radiation or conduction of electromagnetic waves in an electromagnetic environment. EMS refers to the ability of electronic devices to operate normally in an electromagnetic environment without being affected by electromagnetic interference from other devices. To address EMC issues, a series of design and testing measures need to be taken.

Electromagnetic interference (EMI) refers to the phenomenon in which electronic devices are disturbed in the normal operation of other devices due to the radiation or conduction of electromagnetic waves in an electromagnetic environment. Electromagnetic interference can be divided into two types: radiated interference and conducted interference.

Radiation interference refers to the electromagnetic waves generated by changes in current and voltage in electronic devices, which propagate through the air to other devices and cause interference. The suppression method of radiation interference mainly involves designing a reasonable shielding structure and ground wire layout to reduce the electromagnetic wave intensity radiated by electronic devices.

Conducted interference refers to the interference caused by changes in current and voltage in electronic devices through conductive pathways such as wires and cables, resulting in interference with other devices. The suppression method of conducted interference mainly involves selecting appropriate circuit components such as filters and isolators to reduce the electromagnetic wave interference conducted by electronic devices.

Electromagnetic interference can have adverse effects on the normal operation of electronic devices, such as causing errors, noise, distortion, and even causing equipment malfunctions and damage. Therefore, in the design and production process of electronic devices, it is necessary to consider electromagnetic compatibility (EMC) issues and take corresponding design and testing measures to ensure the stable operation and reliability of the equipment in electromagnetic environments.

EMI standards and EMI testing belong to the scope of EMI testing and are important links in solving EMC problems.

EMI standards refer to normative documents developed and published to evaluate the anti-interference ability and electromagnetic compatibility of electronic devices in electromagnetic environments. EMI standards include international standards, national standards, industry standards, etc., such as the IEC 61000 series standards of the International Electrotechnical Commission (IEC) and Part 15 regulations of the Federal Communications Commission (FCC) in the United States. These standards specify the methods, parameters, and equipment for EMI testing, for reference and compliance by designers, testers, and production personnel.

EMI detection refers to the detection and evaluation of interference generated by electronic devices in electromagnetic environments through specific testing equipment and methods. EMI testing includes radio frequency radiation testing, radio frequency conduction testing, conducted interference testing, radiation interference testing, transient conduction testing, and transient radiation testing. The purpose of EMI testing is to evaluate the anti-interference ability of electronic devices in electromagnetic environments and to test whether they meet the requirements of EMI standards.

EMI standards and EMI testing are very important steps in solving EMC problems. By adhering to standards and conducting testing, the EMC capability of electronic devices can be effectively improved, ensuring stable operation and reliability in electromagnetic environments.