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GB/T 33012 consists of the following parts under the general title Road vehicles - Vehicle test methods for electrical disturbances from narrowband radiated electromagnetic energy:
——Part 1: General;
——Part 2: Off-vehicle radiation sources;
——Part 3: On-board transmitter simulation;
——Part 4: Bulk current injection (BCI).
This is Part 2 of GB/T 33012.
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 11451-2: 2005 Road vehicles - Vehicle test methods for electrical disturbances from narrowband radiated electromagnetic energy - Part 2: Off-vehicle radiation sources.
The technical deviations between this part and ISO 11451-2: 2005 and their justifications are as follows:
——Clause 1 is normatively prepared in accordance with GB/T 1.1-2009;
——ISO 1145-1: 2001 given in the “Normative references” is changed to GB/T 33012.1-2016 modified in relation to ISO 1145-1: 2005;
——in order to realize the consistency with Part1 in the understanding and representation method I, II, III, IV, V given in Table A.1 are changed to L1, L2, etc., and I, II, III, etc. are understood as statues I, II, III, etc.;
——in order to be consistent with other parts, the structure of Clause 6 is adjusted.
The following editorial changes have been made in this part:
——the contents not applicable to Clause 1 in the original international standard (electromagnetic disturbance is limited to narrowband electromagnetic fields) are transferred into test conditions in Clause 4;
——the contents “a) vertical polarization” and “b) horizontal polarization” in “Figure 1 Example of absorber-lined shielded enclosure” in original international standard are modified to "a) front view" and "b) top view" in the national standard due to editorial errors.
——in order to be consistent with other parts, the note “See GB/T 33012.1 for detailed description on FPSC” is added in Annex A.
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 - Vehicle test methods for electrical disturbances from narrowband radiated electromagnetic energy - Part 2: Off-vehicle radiation sources
1 Scope
This part of GB/T 33012 specifies the test conditions, test site, test apparatus, stimulation and monitoring of vehicle, test procedures, etc. for vehicle test methods for electrical disturbances from narrowband radiated electromagnetic energy - off-vehicle radiation sources.
This part is applicable to Categories M, N and O vehicles, regardless of the vehicle propulsion system, (e.g. spark-ignition engine, 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 of the referenced document (including any amendments) applies.
GB/T 33012.1-2016 Road vehicles - Vehicle test methods for electrical disturbances from narrowband radiated electromagnetic energy - Part 1: General (ISO 11451-1: 2005+A1: 2008, MOD)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 33012.1-2016 apply.
4 Test conditions
The applicable frequency range of this test method is 0.01 MHz to 18 000 MHz. Test over the full frequency range could require different field-generating devices, but this does not imply that test of overlapping frequency ranges is required. The electromagnetic disturbance is limited to narrowband electromagnetic fields.
The users shall specify the test severity level(s) over the frequency range. Suggested test severity levels are given in Annex A.
The following standard test conditions shall meet the requirements of GB/T 33012.1-2016:
——test temperature;
——test voltage;
——modulation;
——dwell time;
——frequency step sizes;
——definition of test severity levels;
——test signal quality.
5 Test site
The test should be conducted in absorber-lined shielded enclosure (simulated open field).
The dimension, shape and construction of the enclosure may vary considerably. Whether or not absorbing materials are laid on the floor may lead to different test results. Typically, the floor is not covered with absorbing material, but such covering is allowed. The minimum dimension of the shielding shell is determined according to the following aspects: the size of the test area, the size of the field generating device, the required space between the field generating device and the maximum tested vehicle, and the characteristics of the wave absorbing material. The minimum dimension of the shielded enclosure is determined by the following aspects: dimension of the test region, the dimension of the field-generating device, the needed clearances between these and the largest vehicle to be tested, and the characteristics of the absorbing materials. In order to ensure the accuracy of the test, the appropriate absorbing material, field generating system and enclosure shape are selected such that the amount of extraneous energy in the test region is reduced to below a minimum value. Within the frequency range, the reflected energy in the test region shall be 10 dB or less over the perpendicular energy [not applicable to transmission line system (TLS) field generating systems]. An example of a rectangular absorber-lined shielded enclosure is shown in Figure 1.
Alternatively, the test may be performed at an outdoor test site. The test facility shall comply with (national) legal requirements regarding the emission of electromagnetic fields.
a) Front view
b) Top view
Key:
1——absorber-lined shielded enclosure;
2——RF absorber material;
3——turntable with dynamometer (rotatable ±180°, two sets of rotating drums with adjustable wheelbase);
4——antenna;
5——amplifier room;
6——control room.
Figure 1 Example of absorber-lined shielded enclosure
6 Test apparatus
6.1 General
Multiple antennas and radio frequency (RF) sources are used to generate radiated electromagnetic fields for test, the excepted field strength shall be achieved within the test frequency range. The following instruments/equipment shall be used.
6.2 Field-generating device
The field-generating device may be one or more antennas or a transmission line system (TLS). The construction and orientation shall be such that the generated field can be polarized in the mode specified in the test plan. An example of parallel-plate TLS is shown in Figure 2.
Multiple antennas, amplifiers and directional couplers could be necessary to cover the complete frequency range.
6.2 Field probe
It shall be electrically small dimension and isotropic. The communication lines from the probes shall be fiber-optic links.
6.4 RF signal generator
It shall have internal or external modulation capability.
6.5 High power amplifier(s).
Amplifier harmonics shall meet relevant requirements.
6.6 Power meter (or equivalent measuring instrument)
It is used for measuring forward and reflected power.
a) Front view
b) Top view
Key:
1——shielded enclosure (absorbing materials permitted);
2——conductive plate or set of wires;
3——non-metallic supports;
4——shielded enclosure floor;
5——signal source feed line (coaxial cable);
6——coaxial cable;
7——load;
8——conductive wires;
9——signal source feed connection;
10——turntable.
Figure 2 Example of parallel plate TLS
7 Stimulation and monitoring of vehicle
The vehicle (the device under test or DUT) shall be operated as required in the test plan by using actuators which have a minimum effect on the electromagnetic characteristics, e.g. plastic blocks on the push-buttons, pneumatic actuators (connected by plastic tubes).
Connections to equipment monitoring electromagnetic interference reactions of the vehicle may be accomplished by using fiber-optics or high-resistance leads. Other type of leads 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 possible malfunction of the DUT caused by any electrical connection between the monitoring equipment and the DUT shall be avoided.
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Test conditions
5 Test site
6 Test apparatus
7 Stimulation and monitoring of vehicle
8 Test set-up
9 Test procedures
Annex A (Informative) Functional performance status classification (FPSC)
