GB/T 33014.8-2020 in English

《GB/T 33014.8-2020道路车辆 电气/电子部件对窄带辐射电磁能的抗扰性试验方法 第8部分：磁场抗扰法》由TC114（全国汽车标准化技术委员会）归口，TC114SC29（全国汽车标准化技术委员会电子与电磁兼容分会）执行，主管部门为工业和信息化部。

Road vehicles- Component test methods for electrical/ electronic disturbances from narrow band radiated electromagnetic energy-
Part 8:Immunity to magnetic fields

1 Scope

This part of GB/T 33014 specifies component test methods for electrical/electronic disturbances from narrowband radiated electromagnetic energy- immunity to magnetic fields.

This part applies to the electrical/electronic components of M, N, O and L vehicles (regardless of the 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 33014.1 Road vehicles- Component test methods for electrical/electronic disturbances from narrowband radiated electromagnetic energy - Part 1: General (GB/T33014.1-2016, ISO11452-1:2005, MOD)
VG 95377-13:1993 Electro-magnetic compatibility - Measuring devices and measuring equipment - Measuring antennas. measuring coils and field probes

3 Terms and definitions

For the purposes of this document, the terms and definitions given in GB/T 33014.1 apply.

4 Test conditions

4.1 General

The applicable frequency range of this test method is 0 HZ (DC) and 15 Hz to 150 kHz. The users shall specify the test severity level(s) over the frequency range (see Annex A).

Standard test conditions are given in GB/T 33014 for the following:

- test temperature;

- test voltage;

- dwell time;

- definition of test severity levels.

4.2 Frequency step sizes

The tests shall be conducted at frequencies of 0 Hz (DC), 16.67 Hz, 50 Hz, 60 Hz, 150 Hz, and 180 Hz and with frequency step sizes (logarithmic or linear) not greater than those specified in Table 1. The step sizes other than those in Table 1 shall be documented in the test report.

Note: The 5th harmonic of 16,67 Hz, 50 Hz and 60 Hz may also be tested.

Table 1 Maximum frequency steps sizes
Frequency band
kHz Linear steps
kHz Logarithmic steps
%
0(DC) — —
0.015 - 0.1 0.01 10
0.1 - 1 0.1 10
1 - 10 1 10
10 - 150 10 10

If it appears that the susceptibility thresholds of the DUT are very near to the chosen test level, these frequency step sizes shall be reduced in the frequency range concerned in order to find the minimum susceptibility thresholds.

5 Test location

A shielded room is not required.

6 Test apparatus

6.1 General

The test apparatus shall consist of the following:

- field-generating device(s): radiating loop or Helmholtz coil;

- magnetic field strength monitor;

- low-frequency (LF) generator;

- low-frequency (LF) amplifier (capable of driving inductive load);

- voltmeter;

- current monitor;

- artificial network(s) (optional, see GB/T 33014.1 for charateristics).

6.2 Field-generating device

6.2.1 Radiating loop

Radiating loop is recommended (not suitable for high level d.c. fields), but any similar coil may be used. The loop has the following characteristics:
- diameter: 120 mm;

- number of turns: 20;

- wire: approximate diameter 2.0 mm.

For d.c. fields up to 3,000 A/m, a specialized coil is required in accordance with VG 95377-13:1993.

The magnetic flux density B50mm of this radiating loop with a current I at a distance of 50 mm from the plane of the loop is given by Formula (1):

B50mm =μ0H =95I (1)

where
B is the magnetic flux density, in microtesla;
H is the magnetic field, in amperes per metre;
95 is a constant, in volt. second per ampere per square meter;
I is the coil current, in amperes.
μ0 is the magnetic constant, permeability in vacuum, in Henry per meter.

The magnetic field strength H50mm of this radiating loop with a current I at a distance of 50 mm from the plane of the loop is given by Formula (2):
H50mm = 75.6 I (2)