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Radiated Disturbance
Assess the intensity of electromagnetic energy emitted by equipment to the outside world through space or cables during operation. Space radiation includes magnetic and electric fields, with a magnetic radiation test frequency of 0.009-30MHz, an electric field radiation test frequency of 30MHz-1000MHz, and a cable radiation (CDNE method) test frequency of 30MHz-300MHz
Radiated Emission Test is an important component of Electromagnetic Compatibility (EMC) testing, used to evaluate the electromagnetic energy intensity emitted by equipment to the outside world through space or cables during operation. This electromagnetic energy may cause interference to other devices, affecting their normal operation. The purpose of radiation interference testing is to ensure that the electromagnetic emissions of the equipment are within the allowable range and comply with relevant regulations and standards.
Test purpose
The main purpose of radiation interference testing is to verify whether the electromagnetic energy emitted by the equipment through space or cables during operation is within the standard limit range, and to avoid interference with other equipment. This is crucial for ensuring the electromagnetic compatibility and user satisfaction of devices, especially in fields such as consumer electronics, industrial equipment, medical equipment, and automotive electronics.
Test Standard
Radiation disturbance testing is usually conducted according to international or industry standards, and common standards include:
CISPR 11: Radiation disturbance limit standards for industrial, scientific, and medical (ISM) equipment.
CISPR 22: Radiation disturbance limit standards for Information Technology Equipment (ITE).
CISPR 25: Standard for Radiation Disturbance Limits of Automotive Electronic Equipment.
FCC Part 15: The Federal Communications Commission (FCC) in the United States has radiation interference requirements for electronic devices.
EN 55011, EN 55022, EN 55025: European standards corresponding to CISPR 11, CISPR 22, and CISPR 25, respectively.
test method
Test environment:
Testing is usually conducted in an anechoic chamber or an open test field (OATS) to avoid external electromagnetic interference affecting the test results.
The inner wall of the anechoic chamber is covered with absorbing materials to reduce the reflection of electromagnetic waves.
Test equipment:
Receiving antenna: used to measure the electromagnetic field strength of space radiation.
Cable Coupled Network (CDNE): Used to measure the electromagnetic energy radiated by cables.
Spectrum analyzer: used to analyze the frequency and intensity of electromagnetic signals.
Monitoring equipment: used to monitor the working status of the tested equipment.
Test steps:
Place the test equipment in the testing environment and connect the necessary power and signal lines.
Set the frequency range of the spectrum analyzer according to the testing standards:
Magnetic field radiation: 0.009-30 MHz.
Electric field radiation: 30 MHz-1000 MHz.
Cable radiation (CDNE method): 30 MHz-300 MHz.
Run the test equipment and simulate its normal working state.
Measure the electromagnetic field strength of spatial radiation using a receiving antenna, or measure the electromagnetic energy radiated by cables using a cable coupled network.
Record the test results and compare them with the standard limits.
Test parameters:
Magnetic field radiation: 0.009-30 MHz.
Electric field radiation: 30 MHz-1000 MHz.
Cable radiation (CDNE method): 30 MHz-300 MHz.
Limit requirements: Electromagnetic emissions within different frequency ranges have different limits, depending on the equipment category and standard requirements.
Test result evaluation
By standard: The electromagnetic energy emitted by the tested equipment through space or cables during operation should be within the standard limit range.
Failure criteria: If the electromagnetic emission of the device exceeds the standard limit, it is considered a test failure.
Rectification measures: For devices that have not passed the test, the following measures may need to be taken:
Optimize circuit design to reduce electromagnetic emissions.
Increase shielding measures to suppress electromagnetic radiation.
Use filtering circuits to reduce cable radiation.
Application field
Radiation disturbance testing is widely used in the following fields:
Consumer electronics: such as mobile phones, computers, household appliances, etc.
Industrial equipment: such as PLC, frequency converter, industrial robots, etc.
Medical equipment: such as electrocardiographs, ultrasound devices, etc.
Automotive electronics: such as in car entertainment systems, autonomous driving sensors, etc.
Communication equipment: such as base stations, routers, etc.
Test significance
Through radiation interference testing, it can be ensured that the equipment will not cause electromagnetic interference to other devices during operation, thereby ensuring the electromagnetic compatibility and user satisfaction of the equipment. This is of great significance for improving the reliability and safety of equipment in complex electromagnetic environments, especially in electromagnetic sensitive situations or environments where multiple devices coexist.
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