ISO 7637-2 (Automotive Electrical Transients)
ISO 7637-2 is the international standard that defines test methods for electrical transient conduction along the supply lines of road vehicles. It simulates voltage spikes and disturbances caused by switching and load changes on a twelve or twenty four volt vehicle system, ensuring that onboard electronic equipment tolerates these conditions.
Key Takeaways
ISO 7637-2 tests how onboard electronics withstand electrical transients on vehicle supply lines.
It simulates voltage spikes and disturbances caused by switching and changing electrical loads.
Tests apply to twelve and twenty four volt vehicle electrical systems.
Compliance indicates suitability for vehicle mounted and in vehicle equipment.
The standard defines how electrical transients, brief voltage disturbances travelling along the power supply, are generated and applied to test equipment. Vehicle systems experience these transients when relays, motors and other loads switch on and off.
A vehicle electrical system is electrically noisy. Without adequate immunity, onboard computers and displays could reset, malfunction or be damaged by transient spikes, so this testing is important for reliable in vehicle operation.
The standard addresses both the twelve volt systems common in cars and light vehicles and the twenty four volt systems used in trucks, buses and heavy equipment, each with appropriate test levels.
Rugged vehicle mounted computers, tablets and displays are tested to ISO 7637-2 so that fleet and field operators can trust them to function reliably when powered directly from the vehicle.
Frequently Asked Questions
The ability of onboard electronic equipment to withstand electrical transients on the vehicle power supply lines.
Switching of relays, motors and other electrical loads, as well as changes in the vehicle electrical system.
Yes. It covers both twelve volt and twenty four volt vehicle electrical systems, including heavy vehicles.
Vehicle mounted equipment is powered from a noisy electrical system, so transient immunity ensures it operates reliably without resets or damage.
From Theory to Application
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