Road vehicles―Component test methods for electrical/electronic disturbances from narrowband radiated electromagnetic energy―Part 4:Bulk current injection (BCI)
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GB/T 33014 consists of the following parts under the general title Road vehicles - Component test methods for electrical/electronic disturbances from narrowband radiated electromagnetic energy:
——Part 1: General;
——Part 2: Absorber-lined shielded enclosure;
——Part 3: Transverse electromagnetic (TEM)cell;
——Part 4: Bulk current injection (BCI);
——Part 5: Stripline;
——Part 7: Direct radio frequency (RF) power injection;
——Part 8: Immunity to magnetic field;
——Part 9: Portable transmitters;
——Part 10: Immunity to conducted disturbances in the extended audio frequency range;
——Part 11: Reverberation chamber.
This part is Part 4 of GB/T 33014.
This part is developed in accordance with the rules given in GB/T 1.1-2009.
This part has been redrafted and modified in relation to ISO 11452-4: 2005, Road vehicles - Component test methods for electrical disturbances from narrowband radiated electromagnetic energy - Part 4: Bulk current injection (BCI).
The technical deviations between this part and ISO 11452-4: 2005 and their justifications are as follows:
——Clause 1 is normatively prepared in accordance with GB/T 1.1-2009;
——ISO 11452-1 referenced in the original international standard is changed to GB/T 33014.1 modified in relation to ISO 11452-1;
——"AN, see Annex C for a schematic” given in Sub-clause 7.2 of the original international standard is changed to “AN, see Annex A of GB/T 33014.2-2016 for a schematic”, which is equivalent to the former in contents, to avoid duplication of provisions on the same content and incomplete unification of the original international standard;
——"remotely grounded/ locally grounded... see Annex D" in Sub-clause 7.2 of the original international standard is changed to " remotely/locally grounded... see Annex B of GB/T GB/T 33014.2-2016 ", which is equivalent to the former in contents to avoid duplication of provisions on same content and incomplete unification with the original international standard;
——GB/T 33014.2-2016 is added in “Normative references”;
——in order to realize the consistency with Part 1 in the understanding and representation method, I, II, III, IV, V given in Table C.1 (Table E.1 in the original international standard) are changed to L1, L2, etc., and I, II, III, etc. are understood as statuses I, II, III, etc.;
The following editorial change has been made in this part:
——“Foreword” and “Introduction” in the original international standard are deleted;
——Annexes C and D in the original international standard are deleted, and Annex E in the original international standard is changed to Annex C in this standard.
This part was proposed by the Ministry of Industry and Information Technology of the People's Republic of China.
This part is under the jurisdiction of the National Technical Committee of Auto Standardization (SAC/TC 114).
Road vehicles - Component test methods for electrical/electronic disturbances from narrowband radiated electromagnetic energy - Part 4: Bulk current injection (BCI)
1 Scope
This part of GB/T 33014 specifies bulk current injection (BCI) test methods for determining the immunity of electronic components to electrical/electronic disturbances from narrowband radiated electromagnetic energy.
This part is applicable to electrical/electronic components for Categories M, N, O and L vehicles, regardless of vehicle propulsion system (e.g. spark-ignition engines, diesel engine, electric motor).
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition (including any amendments) applies.
GB/T 33014.1 Road vehicles - Component test methods for electrical/electronic disturbances from narrowband radiated electromagnetic energy - Part 1: General (GB/T 33014.1-2016, ISO 11452-1: 2005, MOD)
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: 2004, MOD)
3 Terms and definitions
For the purpose of this document, the terms and definitions given in GB/T 33014.1 apply.
4 Test conditions
The frequency range of the BCL test method is a direct function of the current probe characteristics, ranging from 1 MHz to 400 MHz. More than one type of current probe may be required.
The users shall specify the test severity level(s) over the frequency range. Suggested test levels are included in Annex E.
Standard test conditions shall be according to GB/T 33014.1 for the following:
——test temperature;
——test voltage;
——modulation;
——dwell time;
——frequency step sizes;
——definition of test severity levels;
——test signal quality.
5 Test location
The test shall be performed in a shielded enclosure.
6 Test apparatus
6.1 General
Bulk current injection (BCI) is a method of carrying out immunity tests by inducing disturbance signals directly into the wiring harness by means of a current injection probe. The injection probe is a current transformer through which the wiring harness of the DUT are passed. Immunity tests are carried out by varying the test severity level and the frequency of induced disturbance.
6.2 Instrumentation
6.2.1 Current injection probe or set of probes, capable of operating over the entire test frequency required to couple the test equipment to the DUT. The probe(s) shall be capable of withstanding a continuous input power over the test frequency range regardless of the system loading
6.2.2 Current measurement probe (s): capable of operating over the entire test frequency range.
6.2.3 Artificial network(s) (AN): see Sub-clause 7.2.
6.2.4 RF generator, with internal or external modulation capabilities.
6.2.5 Power amplifier;
6.2.6 Power meter (or equivalent measuring instrument): for measuring forward power and reflected power.
6.2.7 Current measuring equipment.
6.3 Stimulation and monitoring of DUT
The DUT shall be operated by actuators that have a minimum effect on the electromagnetic characteristics, e.g. plastic blocks on the push-buttons, pneumatic actuators with plastic tubes.
Connections to equipment monitoring electromagnetic interference reactions of the DUT may be accomplished by using fibre-optics, or high-resistance leads. Other types of lead may be used but require extreme care to minimize interactions. The orientation, length and location of such leads shall be carefully documented to ensure repeatability of test results.
Any electrical connection of monitoring equipment to the DUT may cause malfunctions of the DUT. Extreme care shall be taken to avoid such effect.
7 Test set-up
7.1 Ground plane
The ground plane shall be made of 0.5 mm thick (minimum) copper, brass or galvanized steel. The minimum width of the ground plane shall be 1,000 mm. The minimum length of the ground plane shall be 2,000 mm, or the length of the entire underneath of the equipment plus 200mm, whichever is the larger.
The height of the ground plane (test bench) shall be (900±100) mm above the floor. The ground plane shall be electrically overlapped with the shielded enclosure, the distance between grounding copper strips shall not be more than 300 mm, and the DC resistance shall not exceed 2.5 mΩ.
7.2 Power supply and AN
The power supply lead of each DUT shall be connected to the power supply through an AN.
Power supply is assumed to be negative ground. If the DUT utilizes a positive ground then the test set-ups shown in Figures 1 and 2 need to be adapted accordingly. The power supply shall be applied to the DUT via a 5 μH/50 Ω AN (see Annex A of GB/T 33014.2-2016). The number of ANs required depends on the intended DUT installation in the vehicle:
—— For a remotely grounded DUT (vehicle power return line longer than 200 mm), two Ans are required: one for the positive supply line and one for the power return line (see Annex B of GB/T 33014.2-2016).
——For a locally grounded DUT (vehicle power return line 200 mm or shorter): one AN is required for the positive supply (see Annex B of GB/T 33014.2-2016).
The AN(s) shall be directly mounted on the ground plane. The case or cases of the AN(s) shall be bonded to the ground plane. The power supply return shall be connected to the ground plane - between the power supply and the AN(s). The measuring port of each AN shall be terminated with a 50 Ω load.
7.3 Location of DUT
DUT shall be placed on an insulating support (εr≤1.4) at a position (50±5) mm above the ground plane. The case of the DUT shall not be grounded to the ground plane unless it it intended to simulate the actual vehicle configuration. The face of the DUT shall be located at least 100mm from the edge of the ground plane.
There should be a distance at least 500mm between the DUT and any metal part such as the walls of the shielded enclosure, with the exception of the ground plane on which the DUT is placed.
7.4 Location of test harness
The total length of the test harness between the DUT and the load simulator (or the RF boundary) shall be (1,000±10) mm, unless otherwise specified in the test plan. The wiring type is determined by the actual system application and requirement. The test harness shall be placed on an insulation support at a position (50±5) mm above the grounding plate.
The test harness should be straight over its whole length and of fixed (position and number of wires) composition. It should pass through the current injection and current measurement probes. The length of the wires in the simulator should be short by comparison with the length of the wiring harness. The wires within the simulator should be anchored.
7.5 Location of load simulator
Preferably, the load simulator shall be placed directly on the ground plane. If the load simulator has a metallic case, this case shall be bonded to the ground plane.
Alternatively, the load simulator may be located adjacent to the ground plane (with the case of the load simulator bonded to the ground plane) or outside of the test chamber, provided the test harness from the DUT passes through an RF bounded to the ground plane.
When the load simulator is located on the ground plane, the d. c. power supply lines of the load simulator shall be connected through the AN(s).
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Test conditions
5 Test location
6 Test apparatus
7 Test set-up
8 Test methods
Annex A (Normative) Current injection probe calibration
Annex B (Normative) Test set-up transfer impedance
Annex C (Informative) Function performance status classification (FPSC)
