Automotive EMC test includes electromagnetic radiation emission test, radiation immunity test, EMI conduction emission test, transient emission conduction test, transient immunity test, high-current injection method test, TEM small chamber method test, strip line test, electrostatic discharge immunity test and so on.
Electromagnetic Emission Test for Whole Vehicle:
GB/T 18387 / SAE J551-5 Measurement of Magnetic and Electric Field Strength of Electric Vehicles at 9kHz - 30MHz.CISPR 12 / GB 14023 Limits of Radio Nuisance Characteristics of Vehicles, Ships, and Installations Driven by Internal Combustion Engines and Methods of Measurement. Suppression of broadband and narrowband radio nuisance from vehicles driven by internal combustion engines, electric motors or both***. Provides protection for the use of broadcasting receivers in residential environments in the frequency range of 9kHz - 1000MHz.
Vehicle Radiated Immunity Test:
Application basis: ISO 11451-2 0.01MHz-18GHz 100V/m E/emark 20MHz-2GHz 30V/m Vehicle Radiated Immunity (RI) test of the vehicle's external sources is an important test of automotive EMC, according to the international standard ISO 11451-2. E/emark certification requires that the vehicle must carry out electromagnetic emission immunity measurements of 20MHz-2GHz. Foreign vehicle manufacturers generally have this test program, the frequency range of 0.01MHz ~ 18GHz 100V / m or 200V / m, the domestic is also gradually warming up, especially in line with the vehicle E /emark certification of the vehicle outside the source radiation immunity test system.
Automotive electronic EMI conducted emission test: application basis: according to CISPR25, GB18655, ECE-R10.05, the European Union Automotive EMC Directive 2004-104-EC and other standard requirements, automotive electronic parts and components systems and other on-board electronic equipment (including electric vehicle DC-DC modules, on-board chargers, etc.) need to conduct conducted emission test. The power port test uses two sets of (5μH) || 50 Ohm. of LISN artificial power supply network to connect the receiver for testing; control/signal port test uses current probe to connect the receiver for testing.
Automotive Electronics Radiated Emission Test:
Application Basis: Measurements should be made using a linearly polarized electric field antenna with an output impedance (if the antenna impedance is not, a suitable antenna matching unit should be used). The following measurements shall be made using vertical polarization only. The above measurements shall be made with both vertical and horizontal polarization.
Transient Emission Conductivity Test for Automotive Electronics:Application Basis: According to ISO 7637-2, the object under test is regarded as a potential source of conducted interference. The system consists of an artificial power supply network LISN according to ISO 7637-2, a mechanical switch (for measuring slow transient emissions), an electronic switch (for measuring low voltage transient emissions) and a unique control module.
ISO7637&16750 Transient Immunity Test:
The electromagnetic nuisance generated during the normal operation of a vehicle enters into the power and signal lines of the vehicle electronic equipment through conduction and coupling, resulting in degradation of function, transient failures, and even permanent damage.
The ISO7637 automotive electronic immunity test system simulates a variety of typical electromagnetic nuisances generated during the normal operation of a vehicle. The ISO7637 Automotive Electronics Immunity Test System simulates the typical electromagnetic nuisance generated during normal operation of vehicles, and at the same time, it can simulate the changes in the vehicle power supply when the vehicle is starting up, switching the electronic devices and battery charging and discharging. The system integrates P1, P2a, P2b, P3a, P3b, P4, P5a, P5b waveforms, which comprehensively cover the requirements of the latest version of ISO7637-2 and ISO16750-2 standards, and is used for transient conducted immunity testing of vehicle electronic equipment and power supply change immunity.
EA-7637-2 Automotive Electronics Transient Conducted Interference Simulator
High Current Injection Test Method:
Application Basis:A method of immunity testing using a current injection probe by inducting current directly into the connected wiring harness. The injection probe consists of a coupling clamp through which the cable of the system under test is passed, and then the immunity test is performed by changing the frequency of the induced signal. The test method, considered to be the most important test item for automotive electronic module sensitivity testing, is also one of the first items to be constructed by automotive parts companies. It conforms to ISO11452-4 standard.
Automotive electronic electrostatic discharge immunity test:
Automotive electronic electrostatic discharge immunity test is mainly simulated when a person in contact with the test article caused by the discharge (direct discharge), as well as the person or object to the equipment neighboring objects of the discharge (indirect discharge) on the automotive electronic equipment when the work of the impact. Electrostatic discharge can produce a discharge current of 1~50A in 0.5~20ns. Generally, electrostatic discharges do not harm people, but may cause destructive damage to on-board electronic systems, charging piles, and other equipment.
TEM chamber method test:
Application basis: According to: ISO 11452-3 / SAE J1113-24 Road vehicles with narrow-band emitted electromagnetic energy for electronic interference components test method TEM chamber method. Chamber that is, transverse electromagnetic wave chamber is a very limited laboratory space under the conditions of the small test article and cable at the same time placed in the electric field radiation, the test article radiation immunity assessment, generally applicable frequency range 0.01MHz ~ 200MHz chamber in the internal conductor (core plate) and the shell (grounded flat plate) between the generation of a uniform field strength, used to test the immunity of the ESA. The electric field strength within the TEM chamber should be determined by the following equation:
Where: E=Electric field strength, V/m
P=Power input to the chamber, W
Z=Impedance of the chamber (5Ω)
d=Distance between the upper plate and the flat plate (core plate), m
Select the appropriate field strength probe to be placed into the upper part of the TEM chamber. The magnitude of the field strength measured by the field strength probe is the TEM chamber field strength.
Strip line test:
Application basis: According to ISO 11452-5 / SAE J1113-24 Test Method for Electronic Interference Components of Road Vehicles with Electromagnetic Energy Emitted by Narrow Band The strip line method. The stripline method is a method of generating an electric field through the space of a stripline antenna, and performing immunity tests on the wiring harness of an automotive electronic system placed in that field. Applicable frequency is low, generally applicable frequency range 0.01MHz ~ 400MHz.
Automotive electronics proximity radiation immunity test:
Application basis: In recent years, such as cell phones and other mobile communication devices have been used in large quantities, and studies have shown that in the cell phone and other small mobile devices around the power of the emission of a few watts of these devices can produce more than 100V/m field strength. Existing radiated immunity test methods, which test at distances of 1 meter or 3 meters, require expensive power amplifiers, and in order to study the effects of these devices on other electronic devices, such as in-vehicle equipment medical equipment, it is necessary to introduce a more effective radiated immunity test method that can produce very high field strengths using 10 to 20 watt amplifiers.
Automotive Radiated Immunity Testing:
Application Rationale: Automotive radiated immunity testing is the most common test method for automotive electronics, and involves exposing the device under test to a radiated electromagnetic field generated by an antenna. The size of the test level is generally determined by the performance of the device under test, the current maximum field strength of up to , special frequency bands up to radar waves. Radiation immunity test layout: the main test equipment: RF signal source, power amplifier, dual-channel power meter, directional coupler, RF switch, field strength meter, high gain antenna, test software and other professional accessories, test environment: semi-electrical wave darkroom.