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Conducted emission current method testing
Mainly measuring the interference on the signal line of automotive electronic products, with a frequency range of 0.15~224MHz
Conducted emission current testing is a method used to measure electromagnetic interference (EMI) on signal lines of automotive electronic products. This test mainly targets interference signals in the frequency range of 0.15~224 MHz, evaluating whether the conducted noise generated by the equipment on the signal line meets relevant electromagnetic compatibility (EMC) standards.
Test purpose
Evaluate the conducted interference generated by automotive electronic products on signal lines.
Ensure that the equipment complies with international and industry standards such as CISPR 25, ISO 11452, etc.
Prevent conducted interference from affecting the normal operation of other electronic systems in the vehicle.
Test Principle
The conducted emission current method evaluates the interference level by measuring the common mode current on the signal line. Common mode current is the interference current flowing between the signal line and the reference ground, usually caused by high-frequency noise.
test equipment
Current probe:
Used to measure common mode current on signal lines.
The frequency range should cover 0.15~224 MHz.
Spectrum analyzer or EMI receiver:
Used to analyze the frequency and amplitude of interference signals.
Artificial Power Network (LISN):
Used to isolate interference between the tested equipment and the power supply, and provide standardized testing conditions.
Shielded room or anechoic chamber:
Provide a testing environment without external interference.
Test steps
Preparation:
Install the device under test (DUT) on the test bench and connect the signal and power lines.
Ensure that all connections meet the testing standard requirements.
Connect testing equipment:
Clamp the current probe onto the signal line and connect it to a spectrum analyzer or EMI receiver.
Connect the power cord using LISN to ensure that power interference is isolated.
Set test parameters:
Set the frequency range of the spectrum analyzer or EMI receiver to 0.15~224 MHz.
Choose the appropriate scanning step size and resolution bandwidth (RBW).
Conduct testing:
Start the tested device to ensure it is in normal working condition.
Measure the common mode current on the signal line using a current probe and record the spectral data.
data analysis
Analyze spectrum data to identify the frequency and amplitude of interference signals.
Compare the test results with the standard limits to determine if they are qualified.
Test Standard
CISPR 25: Limits and measurement methods for radio disturbance characteristics for vehicles, ships, and internal combustion engines.
ISO 11452: Road vehicles - Test method for narrowband radiated electromagnetic energy immunity.
OEM standards: Automakers may establish stricter corporate standards.
limit requirement
The limit value for conducting emission current method testing is usually measured in dB μ A, and the specific limit value depends on the frequency range and testing standards. For example:
0.15~30 MHz: The limit is relatively high, usually between 40~60 dB μ A.
30-224 MHz: The limit is relatively low, usually 30-50 dB μ A.
Precautions
Grounding: Ensure that the tested equipment and testing equipment are well grounded to avoid grounding noise affecting the test results.
Shielding: Conduct testing in a shielded room or anechoic chamber to avoid external interference.
Calibration: Before testing, calibrate the current probe and spectrum analyzer to ensure measurement accuracy.
Equipment status: Ensure that the tested equipment is in a typical working state, covering all possible sources of interference.
Common problems and solutions
Excessive interference:
Reason: Insufficient power filtering, unreasonable signal line design, poor grounding, etc.
Solution: Add filters, optimize PCB layout, and improve grounding design.
The test results are unstable:
Reason: External interference, unstable device operation status.
Solution: Test in a shielded environment to ensure consistent device operation.
Application field
Automotive electronics: in car entertainment systems, engine control units (ECUs), sensors, etc.
Industrial electronics: industrial controllers, motor drivers, etc.
Consumer electronics: smart devices, household appliances, etc.
Conclusion
Conducting emission current testing is an important means of evaluating the electromagnetic compatibility of automotive electronic products. By measuring the conducted interference on the signal line, potential EMI issues can be identified and resolved, ensuring that the equipment complies with relevant standards and meets the electromagnetic compatibility requirements of the entire vehicle. During the testing process, attention should be paid to equipment calibration, environmental shielding, and data analysis to ensure the accuracy and reliability of the test results.
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