CENTURY WIDOM

Wisdom

图片名称

CN

图片名称

English

图片名称

Search

Technical column

CASES

图片名称

The difference between the 2007 version of ISO11452-8 standard and the 2015 version

Release time:

2022-11-20 00:00

Source:

　　The ISO11452-8 standard for automotive electronics EMC, during the interpretation process, the author found that there are many differences between the 2007 version and the 2015 version, some of which are understandable, such as the addition of DC (0Hz) test requirements, and some are difficult to understand Yes, for example, in the process of formula derivation, there are 10n times differences in the coefficients. It is now compiled into a document and shared on the website, hoping to share it and improve it together.

　　Test method for immunity of road vehicle electrical/electronic components to narrowband radiated electromagnetic energy

　　Part 8: Magnetic Field Immunity Method

　　2. Reference standards

　　2007 version:

　　ISO 11452-1: Test methods for immunity of road vehicle electrical/electronic components to narrowband radiated electromagnetic energy - Part 1: General provisions

　　2015 version:

　　ISO 11452-1: Test methods for immunity of road vehicle electrical/electronic components to narrowband radiated electromagnetic energy - Part 1: General provisions

　　VG95377-13 : 1993 Electromagnetic Compatibility Measuring Sets and Measuring Equipment Measuring Antennas, Measuring Coils and Field Probes

　　3.2/4.2, frequency step size

　　2007 version:

　　The single-point frequency of the test should be 16.67Hz, 50Hz, 60Hz, 150Hz and 180Hz, and the frequency step (logarithmic or linear) of the frequency sweep test should not be greater than the frequency step specified in Table 1.

　　Table 1 Maximum frequency step size

　　2015 version:

　　The single-point frequency of the test should be 0Hz (DC), 16.67Hz, 50Hz, 60Hz, 150Hz and 180Hz, and the frequency step (logarithmic or linear) during the frequency sweep test should not be greater than the frequency step specified in Table 1.

　　Table 1 Maximum frequency step size

　　5.1/ 6.1 Overview of test equipment

　　2007 version:

　　Artificial power network AN (optional, see ISO11452-4 for characteristics)

　　2015 version:

　　Artificial power network AN (optional, see ISO11452-1 for characteristics)

　　5.2.1/6.2.1 Radiation ring

　　2007 edition

　　Radiating loops (MIL STD 461E) are recommended, but similar coils can be used. Radiation ring parameters are as follows:

　　——Diameter: 120mm;

　　——Number of turns: 20;

　　--- Wire: the diameter is approximately 2.0mm.

　　The magnetic flux density at a distance of 50 mm from the plane of the radiating ring is given by formula (1):

　　B = μ 0 H =9.5 ×10-5I ……………………( 1 )

　　The undisturbed magnetic field at 50 mm from the plane of the coil is given by equation (2):

　　H =75. 6 I……………………( 2 )

　　Radiation loops should be characterized over frequency. Non-linear characteristics should be considered when determining the calculated current value for DUT testing.

　　2015 edition

　　Radiating loops (MIL STD 461F) are recommended, but similar coils can be used. Radiation ring parameters are as follows:

　　——Diameter: 120mm;

　　——Number of turns: 20;

　　--- Wire: the diameter is approximately 2.0mm.

　　For a DC magnetic field up to 3000A/m, special coils are required, whose characteristics comply with VG95377-13:1993.

　　When the distance from the ring plane of the radiation ring MIL STD 461F is 50mm, the magnetic flux density B 50mm of the radiation ring with the current I in the ring is calculated according to the formula (1):

　　B 50mm = μ 0 H =95 I ……………………( 1 )

　　In the formula:

　　B——Magnetic flux density, the unit is micro Tesla (μ T );

　　H——magnetic field, the unit is ampere per meter (A/m);

　　95——constant, the unit is volt-second per ampere square meter ( V s / A m2 );

　　I——coil current, the unit is ampere (A);

　　When the distance from the ring plane of the radiation ring is 50mm, the magnetic field strength H of the radiation ring whose current in the ring is I is 50mm, calculated according to the formula (2):

　　H 50mm =75. 6 I……………………( 2 )

　　In the formula:

　　H——magnetic field, the unit is ampere per meter (A/m);

　　75. 6 ——constant, the unit is per meter (/ m );

　　I——coil current, the unit is ampere (A).

　　The characteristics of the radiating loop should be given over the entire frequency range. The linearity characteristic shall be considered when determining the current value calculated for the DUT test.

　　5.2.2 /6. 2. 2 Helmholtz coil

　　2007 edition

　　Ideally, the Helmholtz coil creates a uniform magnetic field region, and its role is to expose the DUT to a uniform magnetic field.

　　The radius of the coil is determined by the size of the DUT. In order to obtain a uniform magnetic field (±10%), the spatial dimension relationship between the coil and the DUT should satisfy Figure 3. The uniform magnetic field area shown in Figure 3 should be at least 300mm×300mm×300mm.

　　When the distance between the Helmholtz coils is R, the magnetic flux density B at the center of the system is calculated according to formula (3):

　　B = μ 0 H = 8.992×10-7 N × I/R……………………( 3 )

　　In the formula:

　　B——Magnetic flux density, the unit is micro Tesla (μ T );

　　N——the number of turns of the wire in the coil;

　　R——coil radius, in meters (m);

　　I——coil current, the unit is ampere (A);

　　H——magnetic field, the unit is ampere per meter (A/m);

　　μ 0——Magnetic constant, magnetic permeability in vacuum, unit is Henry per meter (H/m);

　　The undisturbed magnetic field H at the center of the system is calculated according to formula (4):

　　H = 0.7155 N × I/R……………………( 4 )

　　The ampacity and number of turns of the selected coil should meet the test specifications.

　　The self-resonant frequency of the coil should not be less than or equal to the upper limit frequency of 150kHz.

　　The characteristics of the Helmholtz coil shall be given over the entire frequency range.

　　2015 edition

　　Ideally, the Helmholtz coil creates a uniform magnetic field region, and its role is to expose the DUT to a uniform magnetic field.

　　The radius of the coil is determined by the size of the DUT. In order to obtain a uniform magnetic field (±10%), the spatial dimension relationship between the coil and the DUT should satisfy Figure 3. The uniform magnetic field area shown in Figure 3 should be at least 300mm×300mm×300mm.

　　When the distance between the Helmholtz coils is R, the magnetic flux density B at the center of the system is calculated according to formula (3):

　　B = μ 0 H = 0.899× N × I/R……………………( 3 )

　　In the formula:

　　B——Magnetic flux density, the unit is micro Tesla (μ T );

　　N——the number of turns of the wire in the coil;

　　R——coil radius, in meters (m);

　　I——coil current, the unit is ampere (A);

　　H——magnetic field, the unit is ampere per meter (A/m);

　　μ 0——Magnetic constant, magnetic permeability in vacuum, unit is Henry per meter (H/m);

　　0. 899 —— constant, the unit is Henry per meter ( H / m );

　　The magnetic field H at the center of the system is calculated according to formula (4):

　　H = 0.7155 N × I/R……………………( 4 )

　　In the formula:

　　H——magnetic field, the unit is ampere per meter (A/m);

　　N - the number of turns of the wire in the coil;

　　R——coil radius, in meters (m);

　　I——coil current, the unit is ampere (A);

　　The ampacity and number of turns of the selected coil should meet the test specifications.

　　The self-resonant frequency of the coil should not be less than or equal to the upper limit frequency of 150kHz.

　　The characteristics of the Helmholtz coil shall be given over the entire frequency range. The linearity characteristic shall be considered when determining the current value calculated for the DUT test.

　　5.3 / 6.3 Current Monitor

　　2007 edition

　　By using a clamp-on probe or by measuring the voltage on the shunt resistor to monitor the current, the current monitor should ensure that the current measured in the frequency range of 15Hz~150kHz is a true rms value.

　　Current monitors that can be used are an oscilloscope, a true rms ac voltmeter, or a true rms ac ammeter.

　　2015 edition

　　By using a clamp-on probe or by measuring the voltage across the shunt resistor to monitor the current, the current monitor should ensure that the current measured in the frequency range of 0Hz (DC) and 15Hz~150kHz is a true RMS value.

　　Current monitors that can be used are an oscilloscope, a true rms ac voltmeter, or a true rms ac ammeter.

　　5.3 / 6. 4 Magnetic Field Strength Monitor

　　2007 edition

　　For the radiation ring method, the magnetic field strength monitor used complies with the following requirements:

　　——Diameter: 40mm;

　　——Number of turns: 51;

　　- Conductor: 7-strand enamelled wire with a diameter of approximately 0.071 mm;

　　--- shielding: electrostatic shielding;

　　---Correction factor: the calibration coefficient that converts the coil voltage of the sensor into the magnetic field strength.

　　The open-circuit voltage U induced in the ring sensor can be measured by a high-impedance voltmeter, and can also be calculated by formula (5):

　　U =2π f × N × A × B……………………( 5 )

　　In the formula:

　　f——frequency, the unit is hertz (Hz);

　　N - the number of turns of the wire in the coil;

　　A - the cross-sectional area of ​​the coil, calculated from the average diameter of the coil, in square meters (m2);

　　B——Magnetic flux density, the unit is Tesla (T).

　　Usually the magnetic field strength monitor should be able to measure the magnetic field strength of at least 1000A/m at 15Hz~150kHz.

　　2015 edition

　　For the radiation ring method, the magnetic field strength monitor used complies with the following requirements:

　　a) At direct current, the magnetic field strength monitor shall be a measuring instrument based on a Hall sensor and shall be capable of measuring a magnetic field strength of at least 3000A/m.

　　b) When f ≥ 15Hz, the recommended magnetic field strength monitor is a ring sensor that meets the following requirements:

　　——Diameter: 40mm;

　　——Number of turns: 51;

　　- Conductor: 7-strand enamelled wire with a diameter of approximately 0.071 mm;

　　--- shielding: electrostatic shielding;

　　---Correction factor: the calibration coefficient that converts the coil voltage of the sensor into the magnetic field strength.

　　The open-circuit voltage U induced in the ring sensor can be measured by a high-impedance voltmeter, and can also be calculated by formula (5):

　　U =2π f × N × A × B……………………( 5 )

　　In the formula:

　　f——frequency, the unit is hertz (Hz);

　　N - the number of turns of the wire in the coil;

　　A - the cross-sectional area of ​​the coil, calculated from the average diameter of the coil, in square meters (m2);

　　B——Magnetic flux density, the unit is Tesla (T).

　　Usually the magnetic field strength monitor should be able to measure the magnetic field strength of at least 1000A/m at 15Hz~150kHz.

　　7. 3. 1. 3 / 8. 3. 1. 3 DUT test

　　2007 edition

　　During the test, the test level specified in the test plan is applied to the DUT.

　　The test shall be arranged according to Figure 5.

　　2015 edition

　　During the test, the test level specified in the test plan is applied to the DUT. The test shall be carried out under three axial polarizations.

　　The test shall be arranged according to Figure 5.

　　Appendix A

　　A.2.2 Magnetic field inside the vehicle

　　2007 edition

　　Table A.1 and Figure A.1 give examples of severity levels for in-vehicle magnetic field tests.

　　Table A.1 Example of test severity level (in-vehicle magnetic field)

　　2015 edition

　　Table A.1 and Figure A.1 give examples of severity levels for in-vehicle magnetic field tests.

　　Table A.1 Example of test severity level (in-vehicle magnetic field)

Century Wisdom (Suzhou) Testing Technology Co., Ltd

Business License
全部
  • 全部
  • 产品管理
  • 新闻资讯
  • 介绍内容
  • 企业网点
  • 常见问题
  • 企业视频
  • 企业图册
Search