Technical Information
Radio interference characteristics detection in vehicles, ships and internal combustion engines
[ 12-17-2024 ]
The radio interference characteristic detection of vehicles, ships, and internal combustion engines mainly follows specific national standards or international standards. The following are some common detection methods:
1. Detection standards
The radio interference characteristic detection of vehicles, ships, and internal combustion engines usually follows the GB/T 18655 series of standards (such as GB/T 18655-2018) or CISPR (International Special Committee on Radio Interference) related standards. These standards specify the limits and measurement methods of radio interference and are applicable to electromagnetic emission tests of vehicles, ships, and internal combustion engines.
2. Detection methods
Radiated emission test (RE)
Purpose: To detect the radiated interference emitted by the product.
Frequency band: Generally 150kHz to 2.5GHz.
Antenna: Depending on the test frequency band, different types of antennas are used, such as monopole vertical antennas, biconical antennas, logarithmic periodic antennas, etc.
Test environment: It is carried out in a semi-anechoic chamber to ensure that the electromagnetic shielding of the test environment is good.
Test steps: Place the device under test on the test bench, connect the antenna and the measuring equipment, measure according to the test method specified in the standard, and record the measurement results.
Conducted emission test (CE)
Purpose: To measure the continuous disturbance of the power line or signal line.
Frequency band: Usually the same or similar to the radiated emission test.
Test method:
Voltage method: Mainly test the conducted emission of the power port.
Current probe method: Mainly test the conducted emission of the signal port.
Test environment: Performed in an electromagnetic shielding room to ensure that the electromagnetic interference in the test environment is minimal.
Test steps: Connect the power line or signal line of the device under test to the measuring device, measure according to the test method specified in the standard, and record the measurement results.
Test of components/modules
Purpose: Perform separate electromagnetic emission tests on electronic/electrical components of vehicles, ships, and internal combustion engines.
Test method: According to the type and characteristics of the components, select the appropriate test method, such as conducted emission-voltage method, conducted emission-current probe method, radiated emission-stripline method, etc.
Test environment: Performed in an electromagnetic shielding room to ensure that the electromagnetic interference in the test environment is minimal.
Test steps: Place the components under test on the test bench, connect the test equipment and the measuring equipment, measure according to the test method specified in the standard, and record the measurement results.
3. Precautions
Preparation before testing: Before testing, it is necessary to ensure that the test equipment and the equipment under test are in good working condition, and that the test environment is fully electromagnetically shielded.
During the test: It is necessary to strictly follow the test methods and steps specified in the standard to ensure the accuracy and reliability of the test results.
Analysis of test results: According to the test results, analyze whether the radio interference characteristics of the equipment under test meet the requirements of relevant standards, and put forward corresponding improvement suggestions.
In short, the detection of radio interference characteristics of vehicles, ships, and internal combustion engines is an important electromagnetic compatibility test, which is of great significance to ensure the normal operation of the equipment and reduce electromagnetic interference to the surrounding environment. By following relevant standards and adopting appropriate test methods, the radio interference characteristics of the equipment can be effectively evaluated and corresponding improvement measures can be taken.
1. Detection standards
The radio interference characteristic detection of vehicles, ships, and internal combustion engines usually follows the GB/T 18655 series of standards (such as GB/T 18655-2018) or CISPR (International Special Committee on Radio Interference) related standards. These standards specify the limits and measurement methods of radio interference and are applicable to electromagnetic emission tests of vehicles, ships, and internal combustion engines.
2. Detection methods
Radiated emission test (RE)
Purpose: To detect the radiated interference emitted by the product.
Frequency band: Generally 150kHz to 2.5GHz.
Antenna: Depending on the test frequency band, different types of antennas are used, such as monopole vertical antennas, biconical antennas, logarithmic periodic antennas, etc.
Test environment: It is carried out in a semi-anechoic chamber to ensure that the electromagnetic shielding of the test environment is good.
Test steps: Place the device under test on the test bench, connect the antenna and the measuring equipment, measure according to the test method specified in the standard, and record the measurement results.
Conducted emission test (CE)
Purpose: To measure the continuous disturbance of the power line or signal line.
Frequency band: Usually the same or similar to the radiated emission test.
Test method:
Voltage method: Mainly test the conducted emission of the power port.
Current probe method: Mainly test the conducted emission of the signal port.
Test environment: Performed in an electromagnetic shielding room to ensure that the electromagnetic interference in the test environment is minimal.
Test steps: Connect the power line or signal line of the device under test to the measuring device, measure according to the test method specified in the standard, and record the measurement results.
Test of components/modules
Purpose: Perform separate electromagnetic emission tests on electronic/electrical components of vehicles, ships, and internal combustion engines.
Test method: According to the type and characteristics of the components, select the appropriate test method, such as conducted emission-voltage method, conducted emission-current probe method, radiated emission-stripline method, etc.
Test environment: Performed in an electromagnetic shielding room to ensure that the electromagnetic interference in the test environment is minimal.
Test steps: Place the components under test on the test bench, connect the test equipment and the measuring equipment, measure according to the test method specified in the standard, and record the measurement results.
3. Precautions
Preparation before testing: Before testing, it is necessary to ensure that the test equipment and the equipment under test are in good working condition, and that the test environment is fully electromagnetically shielded.
During the test: It is necessary to strictly follow the test methods and steps specified in the standard to ensure the accuracy and reliability of the test results.
Analysis of test results: According to the test results, analyze whether the radio interference characteristics of the equipment under test meet the requirements of relevant standards, and put forward corresponding improvement suggestions.
In short, the detection of radio interference characteristics of vehicles, ships, and internal combustion engines is an important electromagnetic compatibility test, which is of great significance to ensure the normal operation of the equipment and reduce electromagnetic interference to the surrounding environment. By following relevant standards and adopting appropriate test methods, the radio interference characteristics of the equipment can be effectively evaluated and corresponding improvement measures can be taken.