ISO 7637-1:2023

INTERNATIONAL ISO
STANDARD 7637-1
Fourth edition
2023-12
Road vehicles — Electrical
disturbances from conduction and
coupling —
Part 1:
Vocabulary and general
considerations
Véhicules routiers — Perturbations électriques par conduction et par
couplage —
Partie 1: Vocabulaire et généralités
Reference number
© ISO 2023
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ii
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 General aim and practical use of the ISO 7637 series . 4
5 General test conditions .6
5.1 General . 6
5.2 Test temperature . 6
5.3 Supply voltage . 6
5.4 Definition of test severity level . 6
Annex A (normative) Function performance status classification (FPSC) .7
Bibliography .10
iii
Foreword
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This document was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 32,
Electrical and electronic components and general system aspects.
This fourth edition cancels and replaces the third edition (ISO 7637-1:2015), which has been technically
revised.
The main changes are as follows:
— addition of ISO/TS 7637-4 in general aim and practical use;
— addition of supply voltage and tolerances for high voltage electrical systems.
A list of all parts in the ISO 7637 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
iv
Introduction
Electrical and radio-frequency disturbances occur during normal operation of many items of motor
vehicle equipment. They are generated over a wide frequency range and can be distributed to on-board
electronic devices and systems by conduction, coupling or radiation.
In recent years, an increasing number of electronic devices for controlling, monitoring and displaying a
variety of functions have been introduced into vehicle designs. It is necessary to consider the electrical
and electromagnetic environment in which these devices operate and, in particular, the disturbances
generated in the vehicle electrical system itself. Such disturbances can cause degradation (temporary
malfunction or even permanent damage) of the electronic equipment. Moreover, “worst-case” situations
are usually those resulting from disturbances generated inside the vehicle by, for example, ignition
systems, generator and alternator systems, electric motors and actuators.
Annex A specifies a general method for function performance status classification (FPSC). Typical
severity levels are included in an annex of each of the other parts of the ISO 7637 series.
While narrowband signals generated on or outside the vehicle (by broadcasting and radio-transmitters)
can also affect the performance of electronic devices, and recognizing that protection from such
potential disturbances has to be considered as part of total system certification, these matters are
nevertheless outside the scope of the ISO 7637 series and are not covered by it.
ISO 11451 and ISO 11452 specify test methods for immunity to radiated disturbances for vehicles
and for components, respectively. ISO 10605 specifies test methods for immunity to electrostatic
discharge (ESD) for vehicle and for components.
v
INTERNATIONAL STANDARD ISO 7637-1:2023(E)
Road vehicles — Electrical disturbances from conduction
and coupling —
Part 1:
Vocabulary and general considerations
1 Scope
This document defines the basic terms relating to electrical disturbances from conduction and coupling
used in the other parts of the ISO 7637 series. It also gives general information on the whole ISO 7637
series.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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.
IEC 60050-151, International Electrotechnical Vocabulary (IEV) — Part 151: Electrical and magnetic
devices
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60050–151 and the following
apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
artificial network
AN
network inserted in the supply lead or signal/load lead of apparatus to be tested which provides, in a
given frequency range, a specified load impedance for the measurement of disturbance voltages and
which can isolate the apparatus from the supply or signal sources/loads in that frequency range
Note 1 to entry: Network inserted in the DC power lines of the device under test (DUT) which provides, in a
given frequency range, a specified load impedance and which isolates the DUT from the DC power supply in that
frequency range.
3.2
high voltage artificial network
HV-AN
network inserted in the high voltage DC lead of apparatus to be tested which provides, in a given
frequency range, a specified load impedance for the measurement of disturbance voltages and which
can isolate the apparatus from the supply in that frequency range
3.3
burst
transient (3.18) comprised of a complex series of transient voltage variations
Note 1 to entry: For bursts, the parameters given in 3.3.1, 3.3.2 and 3.3.3 are also relevant. For an illustration of a
burst transient waveform, see ISO 7637–2.
3.3.1
burst cycle time
time between the start of the first pulse (3.14) of two consecutive bursts (3.3)
3.3.2
burst duration
time during which a complex series of transient voltage variations occurs during a single burst (3.3)
3.3.3
time between bursts
time between the end of one burst (3.3) and the start of the next one
3.4
coupling
means or device for transferring power between systems
Note 1 to entry: For coupling, the parameters given in 3.4.1 and 3.4.2 are also relevant.
[SOURCE: IEC 60050–726–14–01, modified — Note 1 to entry added.]
3.4.1
coupling clamp
device of defined dimensions and electromagnetic characteristics designed for common-mode coupling
(3.4) of the disturbance transient to the circuit under test without any galvanic connection to it
3.4.1.1
capacitive coupling clamp
CCC
special fixture that facilitates capacitive coupling (3.4) of fast transient test pulses (3.16) into signal
lines under test without any galvanic connection to the terminals of the circuits, or any other part of the
device under test (DUT)
3.4.1.2
inductive coupling clamp
ICC
bulk current injection (BCI) type probe to provide the means of coupling (3.4) slow transient test pulses
(3.16) into signal lines under test without any galvanic connection to the terminals of the circuits, or
any other part of the device under test (DUT)
3.4.2
coupling network
electrical circuit for the purpose of transferring energy from one circuit to another
3.4.3
direct capacitive coupling
DCC
method using discrete, non-polarized capacitor to couple fast and slow transient test pluses into the
device under test's (DUT’s) signal lines under test
3.5
degradation
〈performance〉 undesired departure in the operational performance of any device, equipment or system
from its intended performance
Note 1 to entry: The term “degradation” can apply to temporary or permanent failure.
[SOURCE: IEC 60050-161-01-19]
3.6
electromagnetic compatibility
EMC
ability of an equipment or system to function satisfactorily in its electromagnetic environment without
introducing intolerable electromagnetic disturbances (3.7) to anything in that environment
[SOURCE: IEC 60050-161-01-07]
3.7
electromagnetic disturbance
any electromagnetic phenomenon which can degrade the performance of a device, equipment or system,
or adversely affect living or inert matter
Note 1 to entry: An electromagnetic disturbance may be an electromagnetic noise, an unwanted signal or a
change in the propagation medium itself.
[SOURCE: IEC 60050-161-01-05]
3.8
electromagnetic interference
EMI
degradation (3.5) of the performance of equipment, transmission channel or system caused by an
electromagnetic disturbance (3.7)
Note 1 to entry: The English words “interference” and “disturbance” are often used indiscriminately.
[SOURCE: IEC 60050-161-01-06, modified — Notes to entry deleted and a new Note 1 to entry added.]
3.9
electromagnetic radiation
phenomenon by which energy in the form of electromagnetic waves emanates from a source into space;
energy transferred through space in the form of electromagnetic waves
Note 1 to entry: By extension, the term “electromagnetic radiation” sometimes also covers induction phenomena.
[SOURCE: IEC 60050-731-01-01, modified — Note 1 to entry added.]
3.10
susceptibility
〈electromagnetic〉 inability of a device, equipment or system to perform without degradation (3.5) in
the presence of an electromagnetic disturbance (3.7)
Note 1 to entry: Susceptibility is a lack of immunity (3.12).
[SOURCE: IEC 60050-161-01-21]
3.11
ground reference plane
reference plane
flat conductive surface whose potential is used as a c
...