ISO7637 Road Vehicles — Electrical Disturbances from Conduction and Coupling

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ISO 7637 electrical disturbances from conduction and coupling and electrical transient conduction along supply lines of road vehicles.

There three (3) sections to date for this standard. The sections are:

1)  ISO 7637-1:2002 – Part 1: Definitions and general considerations

2)  ISO 7637-2:2011 – Part 2: Electrical transient conduction along supply lines only

This section specifies test methods and procedures to ensure the compatibility to conducted electrical transients of equipment installed on passenger cars and commercial vehicles fitted with 12 V or 24 V electrical systems. It describes bench tests for both the injection and measurement of transients. It is applicable to all types of road vehicles independent of the propulsion system (e.g. spark ignition or diesel engine, electric motor) Function performance status classification for immunity to transients is also provided.
3)  ISO 7637-3:2007 – Part 3: Electrical transient transmission by capacitive and inductive coupling via lines other than supply lines

This section establishes a bench top test for the evaluation of the immunity of devices under test (DUTs) to transient transmission by coupling via lines other than supply lines. The test transient pulses simulate both fast and slow transient disturbances, such as those caused by the switching of inductive loads and relay contact bounce.

Three test methods are described in ISO 7637-3:2007:

A)  the capacitive coupling clamp (CCC) method;
B)  the direct capacitive coupling (DCC) method; and
C)  the inductive coupling clamp (ICC) method.

Only one test method need be selected for slow transients and only one method need be selected for fast transients.ISO 7637-3:2007 applies to road vehicles fitted with nominal 12 V, 24 V or 42 V electrical systems.

For transient immunity, Annex B provides recommended test severity levels in line with the functional performance status classification (FPSC) principle described in ISO 7637-1.