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GB/T 33014.2-2025 PDF English

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GB/T 33014.2-2025: Road vehicles - Component test methods for electrical/electronic disturbances from narrowband radiated electromagnetic energy - Part 2: Absorber-lined shielded enclosure
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GB/T 33014.2: Evolution and historical versions

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GB/T 33014.2-2025English515 Add to Cart 0-9 seconds. Auto-delivery Road vehicles - Component test methods for electrical/electronic disturbances from narrowband radiated electromagnetic energy - Part 2: Absorber-lined shielded enclosure Valid
GB/T 33014.2-2016English125 Add to Cart 0-9 seconds. Auto-delivery Road vehicles -- Component test methods for electrical/electronic disturbances from narrowband radiated electromagnetic energy -- Part 2: Absorber-lined shielded enclosure Valid

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GB/T 33014.2-2025: Road vehicles - Component test methods for electrical/electronic disturbances from narrowband radiated electromagnetic energy - Part 2: Absorber-lined shielded enclosure


---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT33014.2-2025
GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 43.040.10 CCS T 36 Replacing GB/T 33014.2-2016 Road vehicles - Component test methods for electrical/ electronic disturbances from narrowband radiated electromagnetic energy - Part 2.Absorber-lined shielded enclosure (ISO 11452-2.2019, Road vehicles - Component test methods for electrical disturbances from narrowband radiated electromagnetic energy - Part 2.Absorber- lined shielded enclosure, MOD) Issued on: AUGUST 01, 2025 Implemented on: FEBRUARY 01, 2026 Issued by. State Administration for Market Regulation; Standardization Administration of the People’s Republic of China.

Table of Contents

Foreword... 3 Introduction... 6 1 Scope... 8 2 Normative references... 8 3 Terms and definitions... 8 4 Test conditions... 9 5 Test site... 9 6 Test instruments and equipment... 9 7 Test setup for DUT powered by unshielded power system... 10 8 Test setup for DUT powered by shielded power system... 17 9 Test methods... 40 Appendix A (Informative) Functional performance state classification (FPSC)... 43 Appendix B (Informative) Far-end/near-end grounding... 44 Bibliography... 46 Road vehicles - Component test methods for electrical/ electronic disturbances from narrowband radiated electromagnetic energy - Part 2.Absorber-lined shielded enclosure

1 Scope

This document describes the absorber-lined shielded enclosure for testing the immunity of electrical/electronic components to continuous narrowband radiated electromagnetic energy. This document applies to electrical/electronic components for vehicles of categories M, N, O and L (not limited to vehicle powertrains, e.g., spark ignition engines, diesel engines, electric motors).

2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO11452-1, Road vehicles - Component test methods for electrical disturbances from narrowband radiated electromagnetic energy - Part 1.General principles and terminology Note. GB/T 33014.1-2016, Road vehicles - Component test methods for electrical/electronic disturbances from narrowband radiated electromagnetic energy - Part 1.General (ISO 11452-1.2005, MOD)

3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 11452-1 apply.

4 Test conditions

The applicable frequency of the absorber-lined shielded enclosure is 80 MHz ~ 18 GHz. The user shall specify the test severity level within the frequency range. Recommended test levels and functional characteristic status classifications are shown in Appendix A. The following standard test conditions shall comply with the provisions of ISO 11452- 1. -- test temperature; -- supply voltage; -- modulation mode; -- dwell time; -- frequency step size; -- definition of test severity levels; -- test signal quality.

5 Test site

The test shall be carried out in an absorber-lined shielded enclosure (ALSE). ALSE is an independent electromagnetic compatibility test site established to simulate open field tests. Typically an ALSE is a shielded enclosure where all internal reflective surfaces, except the floor, are covered with absorbing materials. However, the floor may also be paved with flat ferrite tiles with a maximum thickness of no more than 25 mm. Field strength calibration and device under test (DUT) testing shall be performed in an ALSE with the same configuration. The reflected energy in the test area must be at least 10 dB lower than the incident energy. Note. To achieve this goal, the absorbing material performance of walls and ceilings is generally greater than or equal to 6 dB within the operating frequency range. IEEE STD 1128-1998 describes the test methods for evaluating absorbing materials.

6 Test instruments and equipment

6.1 General The radiated electromagnetic field is generated using an antenna and a radio frequency (RF) energy source that can generate the required field strength. A set of antennas and multiple RF power amplifiers may be required to cover the test frequency range. 6.2 Test apparatus 6.2.1 Field generating device. An antenna that can radiate a predetermined field strength to the DUT at a certain power (including a high-power balanced-unbalanced transformer, if applicable). The structure and orientation of the field generating device shall ensure that the field strength in the polarization direction specified in the test plan is generated. 6.2.2 Field strength probe. It shall be of electrically small size (compared to the wavelength), isotropic and have three orthogonal axes. The transmission line of the probe shall be optical fiber. 6.2.3 Artificial network (AN), high-voltage artificial network (HV-AN), artificial mains network (AMN) and asymmetric artificial network (AAN). see 7.2 and Appendix B of ISO 11452-1.2015. 6.2.4 RF signal generator. can be internally or externally modulated. 6.2.5 High-power amplifier. 6.2.6 Power meter and/or power sensor (or equivalent measuring instrument) and bidirectional coupler. measure forward power and reverse power. 6.3 DUT actuator and monitoring equipment The DUT shall be operated using the actuators as required by the test plan. The actuator has the smallest possible electromagnetic effect, such as plastic buttons, pneumatic actuators (plastic tubes are used for the air supply pipeline), etc. Monitoring equipment that monitors the DUT's response to electromagnetic interference can be connected using optical fibers or high-impedance wires. If other types of connections are used, extreme care must be taken to minimize interaction between the wires. The arrangement direction, length and position of the conductors shall be recorded to ensure the reproducibility of the test results. Any electrical connection between the monitoring equipment and the DUT may cause malfunction of the DUT, and extreme care shall be taken to avoid this effect.

7 Test setup for DUT powered by unshielded power system

7.1 Ground plane The ground plane shall be made of copper, brass, bronze or galvanized steel with a thickness of at least 0.5 mm. The minimum width of the ground plane shall be 1 000 mm or 200 mm greater than the projected width of the entire test setup [DUT and associated equipment (such as the test harness including power cables, simulated loads located on the test bench and AN), excluding batteries and/or power supplies] on the horizontal plane, whichever is greater. The minimum length of the ground plane shall be 2 000 mm or 200 mm greater than the projected length of the entire test setup [DUT and associated equipment (such as the test harness including power cables, simulated loads located on the test bench and AN), excluding batteries and/or power supplies] on the horizontal plane, whichever is greater. The height of the ground plane (test bench) from the ground is (900±100) mm. The ground plane shall be electrically bonded to the shielding room casing, and the DC resistance shall not exceed 2.5 mΩ. The maximum distance between the edges of adjacent grounding strips shall be 300 mm, and the maximum length-to-width ratio of the grounding strip shall be 7.1. 7.2 Power and Artificial Network (AN) Each power line of the DUT shall be connected to the power supply through AN. Usually the negative pole of the power supply is grounded. If the DUT uses the positive ground of the power supply, the test setup shown in the figure needs to be adjusted accordingly. The power supply is connected to the DUT through a 5 μH/50 Ω AN (see ISO 11452-1.2015 Appendix B schematic). The number of ANs required depends on how the DUT is installed on the vehicle. -- Remote grounding of the DUT (vehicle power return line greater than 200 mm). Two ANs are required, one for the positive power supply and the other for the power return line (see Appendix B). -- DUT near-end grounding (vehicle power return line no more than 200 mm). Use one AN for the positive power supply (see Appendix B). AN shall be installed directly on the ground plane, and the casing of AN shall overlap the ground plane. The power return line shall be connected to the ground plane between the power supply and AN. The measurement port of each AN shall be connected to a 50 Ω load. The length of the power supply cable between the power supply and the simulated load should be kept as short as possible and specified in the test plan. Unless otherwise specified, the power supply lines between the power supply and the simulated load shall be placed directly on the ground plane. 7.3 DUT location Unless otherwise specified in the test plan, the DUT shall be placed on a non-conductive, low relative dielectric constant (εr ≤ 1.4) material at a position of (50 ± 5) mm above the ground plane. The DUT housing shall not be connected to the ground plane (except to simulate the actual vehicle structure). The surface of the DUT shall be (200±10) mm away from the edge of the ground plane. 7.4 Location of test harness The length of the part of the test harness parallel to the front edge of the ground plane shall be (1500±75) mm. The total length of the test harness between the DUT and the simulated load (or RF interface) shall be 1700+300 0 mm. The type of wiring harness is determined according to the actual system requirements. The detailed setup of the wiring harness between the front edge of the ground plane and the DUT connector shall be described in the test plan. The test harness shall be placed on a non-conductive material with a low relative dielectric constant (εr ≤ 1.4) at a position (50 ± 5) mm above the ground plane. The distance between the part of the test harness parallel to the front edge of the ground plane and the front edge of the ground plane shall be (100±10) mm. 7.5 Position of simulated load Unless otherwise specified in the test plan, the simulated load shall be placed directly on the ground plane. If the simulated load is a metal casing, the casing shall be directly connected to the ground plane. If the test harness leading from the DUT passes through the RF boundary and overlaps the ground plane, the simulated load can be placed near the ground plane (the casing overlaps the ground plane) or outside the test room. The setup of the test harness connected to the simulated load shall be specified in the test plan and recorded in the test report. If the simulated load is placed on a ground plane, the DC power line of the simulated load shall be connected through AN. 7.6 Location of field generator (antenna) The antenna phase center shall be at a height of (100±10) mm above the ground plane. Any part of the antenna radiator shall be no less than 250 mm from the ground. The antenna radiating element (excluding the rear of the horn antenna) shall be more than 500 mm away from any absorbing material. The distance between the measured harness 3 – Simulated load (placed and grounded as specified in 7.5); 4 – Power supply (location optional); 5 – Artificial network (AN); 6 – Ground plane (connected to the shielding enclosure); 7 – Low relative dielectric constant (εr ≤ 1.4) support; 8 – Horn antenna; 9 – Stimulating and monitoring system; 10 – High-quality coaxial cable e.g., double-shielded (50 Ω); 11 – Bulkhead connector; 12 – RF signal generator and amplifier; 13 – RF absorber material; 14 – Ground straps. a Top view (horizontal polarization). b Front view. c Side view. d See 7.1. e Vertical polarization. Figure 3 – Example of test setup for horn antenna with frequencies above 1 GHz

8 Test setup for DUT powered by shielded power system

8.1 Ground plane See 7.1 for ground plane requirements. 8.2 Power supply and artificial network (AN), high voltage artificial network (HV- AN), mains artificial network (AMN), and asymmetric artificial network (AAN) Each power line of the DUT shall be connected to the power supply through the HV- AN (for DCHV-powered DUT) and/or AMN (for AC-powered DUT). -- The DC HV power supply shall be connected to the DUT through a 5 μH/50 Ω HV-AN (see ISO 11452-1.2015, Appendix B for the schematic diagram). -- The AC power supply shall be connected to the DUT through a 50 μH/50 Ω AMN (see ISO 11452-1.2015 Appendix B for the schematic diagram). The HV-AN shall be mounted directly on a ground plane. The enclosure of the HV-AN shall be bonded to the ground plane. Vehicle's high-voltage battery should be used; if an external high-voltage power supply is used, it shall be connected through a feed-through filter. Shielded power lines such as the high-voltage DC power line positive pole (HV+), high- voltage DC power line negative pole (HV-) and AC three-phase power line can be shielded separately using separate coaxial cables or a common shield can be used, depending on the connector system used. The shielded wiring harness used in the test shall be representative of typical vehicle wiring harness construction and connector termination applications as specified in the test plan. Unless otherwise specified, the shielding layer of the shielded harness shall be connected to the HV-AN enclosure 360°. When using a power filter (reference number 16 in Figures 4 ~ 12) on a high-voltage power line, it shall be noted that the power filter increases the common-mode capacitance between HV+ and ground or HV- and ground, which may cause additional resonance. For chargers, the AMN shall be placed directly on the ground plane. The enclosure of the AMN shall be bonded to the ground plane. The PE line (protective ground) of the charger shall be connected to the ground plane and connected to the PE of the AMN. Each HV-AN/AMN measurement terminal shall be terminated with a 50 Ω load. 8.3 DUT location Unless otherwise specified in the test plan, the DUT shall be placed directly on the ground plane, with the DUT enclosure connected to the ground plane directly or through a specified impedance. The distance between the front end of the DUT and the edge of the ground plane shall be (200±10) mm. If it is a charger, the charger enclosure shall be connected to the ground plane. 8.4 Location of test harness Unless otherwise specified in the test plan (e.g., using the original vehicle wiring harness), the length of the wiring harness shall be as follows. ......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.


      

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