GB/T 21437.2-2021 English PDF (GBT21437.2-2021)

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GB/T 21437.2-2021: Road vehicles -- Test method of electrical disturbances from conduction and coupling -- Part 2: Electrical transient conduction along supply lines only
GB/T 21437.2-2021
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 43.040.10
CCS T 35
Replacing GB/T 21437.2-2008
Road vehicles - Test method of electrical disturbances from
conduction and coupling - Part 2: Electrical transient
conduction along supply lines only
(ISO 7637-2:2011, Road vehicles - Electrical disturbances from conduction and
coupling - Part 2: Electrical transient conduction along supply lines only, MOD)
ISSUED ON: DECEMBER 31, 2021
IMPLEMENTED ON: JULY 01, 2022
Issued by: State Administration for Market Regulation;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3 
Introduction ... 6 
1 Scope ... 7 
2 Normative references ... 7 
3 Terms and definitions... 7 
4 Test procedures ... 7 
4.1 General provisions ... 7 
4.2 Test temperature and supply voltage ... 8 
4.3 Voltage transient emission test ... 8 
4.4 Transient immunity test ... 12 
5 Test equipment and requirements ... 14 
5.1 Artificial networks ... 14 
5.2 Parallel resistor RS ... 15 
5.3 Switch S ... 15 
5.4 Power ... 17 
5.5 Measuring instruments ... 17 
5.6 Immunity test pulse generator ... 18 
Appendix A (Informative) Example of test pulse severity levels ... 23 
Appendix B (Normative) Transient emission assessment - Voltage waveforms ... 25 
Appendix C (Normative) Verification procedure for test pulse generator ... 28 
Appendix D (Informative) Determination of pulse generator energy ... 31 
Appendix E (Informative) Sources of transients in road vehicle's electrical systems 35 
Appendix F (Informative) Alternative transient test technique based on
electromechanical switching of inductive loads ... 38 
Road vehicles - Test method of electrical disturbances from
conduction and coupling - Part 2: Electrical transient
conduction along supply lines only
1 Scope
This document specifies the test equipment, test methods, requirements for electrical
transient conducted emission and immunity tests of automotive electrical/electronic
components, along power lines.
This document applies to electrical/electronic components, which have a nominal
voltage of 12 V or 24 V, for vehicles of categories M, N, O, L (vehicle power systems
are not limited, such as spark ignition engines, diesel engines, electric motors).
2 Normative references
The contents of the following documents constitute essential provisions of this
document through normative references in the text. Among them, for dated references,
only the version corresponding to the date applies to this document; for undated
references, the latest version (including all amendments) is applicable to this document.
GB/T 21437.1 Road vehicles - Test method of electrical disturbances from
conduction and coupling - Part 1: Definitions and general considerations (GB/T
21437.1-2021, ISO 7637-1:2015, MOD)
3 Terms and definitions
The terms and definitions, which are defined in GB/T 21437.1, apply to this document.
4 Test procedures
4.1 General provisions
The power line's transient emission and immunity tests, which are mentioned in this
document, are carried out in the laboratory, as "bench tests". Some test methods require
the use of artificial networks, to allow comparability of results from different
shall be determined after the vehicle manufacturer and the supplier reach an agreement.
For the grounding method of the DUT, it shall take into account the actual installation
of the vehicle AND be defined in the test plan. If not specified in the test plan, the DUT
shall be placed on a non-conductive material, which is 50 mm ± 5 mm above the
grounding plane.
Use voltage probes and oscilloscopes or waveform acquisition equipment, to measure
supply voltage and disturbance voltage. See Appendix B, for voltage waveform
parameters.
Special attention shall be paid to the fact, that the DUT is disconnected and switched
between various operating modes, during the measurement. The DUT test condition
requirements shall be as specified in the test plan.
Note: It is measured, when the DUT is turned on, in some cases.
An appropriate sampling rate and trigger level shall be selected, to obtain a complete
transient waveform. Select sufficient resolution, to display the largest positive and
negative values of the transient.
Select the appropriate sampling rate and trigger level. Operate the DUT, according to
the test plan. Record the voltage amplitude. Other transient parameters, such as rise
time, fall time, duration width, etc., shall also be recorded. Unless otherwise specified,
it shall collect at least 10 waveforms; record the waveform containing the maximum
positive and negative amplitudes, as well as their associated parameters.
It shall evaluate the measured transients, in accordance with Appendix B; record all
relevant information and test results. If required by the test plan, it shall include the
transient evaluation results, which are related to the performance indicators, as specified
in the test plan.
4.3.2 Arrangement for slow pulse test
The test arrangement is as shown in Figure 1a).
The disturbance source is connected to the parallel resistor RS, the switch S, the power
supply, through the artificial network. Switch S represents the DUT power supply's
main switch (e.g., ignition switch, relay, etc.), which may be located several meters
away from the DUT.
In the case where the DUT uses an internal mechanical switch and/or an electronic
switch, to control the inductive load, the test arrangement of the closure of the internal
switch of DUT (when the switch S is opened, the DUT is powered by the inductive load)
is as shown in Figure 1a).
Given the type of switches inside the DUT [relays, electronic switches, insulated gate
bipolar transistors (IGBTs), etc.], it may not be possible to ensure a controlled closure
Description of index number:
1 - Oscilloscope or equivalent equipment; 2 - Voltage probe; 3 - Artificial network; 4 - DUT
(transient source); 5 - Grounding plane; 6 - Power supply; 7 - Grounding connection (length <
100 mm); RS - Parallel resistor; S - Switch; UA - Supply voltage.
Note: A, B, P are as shown in Figure 3.
a Optional, which has an inductive load as driven by an internal switch.
b It has internal load and switch.
Figure 1 -- Test arrangement for transient emission (continued)
4.4 Transient immunity test
4.4.1 DUT Location
The DUT shall be placed on a non-conductive support, which has a low relative
permittivity (εr ≤ 1.4) AND a thickness of (50 ± 5) mm.
The grounding method of the DUT shell and the grounding plane shall conform to the
actual connection of the vehicle. It shall be specified in the test plan.
4.4.2 Power cord location
For test pulses 3a and 3b, the power line, between the test pulse generator and the DUT
port, shall be placed straight and parallel on a non-conductive support, which has low
relative permittivity (εr ≤ 1.4) AND a thickness of 50 mm ± 5 mm; its length is 500 mm
± 100 mm.
4.4.3 Load simulator location
The load simulator should be placed directly on the grounding plane. If the load
simulator has a metal shell, the shell shall be overlapped with the grounding plane.
The load simulator can be placed adjacent to the grounding plane; its shell is overlapped
with the grounding plane.
4.4.4 Test arrangement
Before the DUT test, without the DUT, adjust the test pulse generator [see Figure 2a)],
to generate the specific pulse polarity, amplitude, width, imp...