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.
2Expert Interpretation
In-depth analysis of the terminology, test methods and functional performance state classification (FPSC) of conducted and coupled interference in vehicle electrical systems in the ISO 7637-1:2023 standard, covering 12V/24V and high-voltage system test requirements, and providing implementation recommendations and standard evolution analysis.
Analysis of the core content of the standard
As the basic terminology part of the series of standards for conducted coupling of electrical disturbances on road vehicles, ISO 7637-1:2023 defines 18 key terms in three categories, including core concepts such as artificial network (AN), burst transient, and coupling device. Compared with the 2015 version, the main additions are:
Requirements for power supply voltage tolerance of high voltage system (>60V DC)
Description of the positioning of ISO/TS 7637-4 in the standard system
Comparison of test system frameworks
Standard volume
Applicable objects
Coupling mode
Key parameters
ISO 7637-2
12V/24V power line
Direct conduction
Voltage (V), time (s)
ISO 7637-3
State I: Normal function throughout the test
State II: Abnormal during the test but can be automatically recovered
State III: Manual restart is required to recover
State IV: Professional repair and restoration is required (permanent damage is prohibited)
Typical case: A headlight control module briefly went out during the pulse test (state II), which meets the L2 severity requirements agreed by the manufacturer.
Implementation suggestions
High-voltage system testing requires special agreement on the supply voltage tolerance (Standard 5.3 clause)
Preferentially use capacitive coupling clamp (CCC) for fast transient testing
Functional status determination should be refined to each sub-functional module
ISO 7637-1:2023 — Road vehicles is an international standard developed by International Organization for Standardization (ISO). 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.
What does ISO 7637-1:2023 cover?
This standard covers: 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.
Who should use this standard?
This standard is intended for organizations, professionals, and stakeholders involved in various industries and sectors. It is applicable to manufacturers, service providers, regulatory bodies, and certification organizations.
What is the latest version of ISO 7637-1:2023?
The current published version is ISO 7637-1:2023, published on 2023-12. Always check for amendments or pending revisions.
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