IEC 60068-2-14 Test N: Change of Temperature - Ensuring Component Performance in Rapid Change Environments

Standard: IEC 60068-2-14 – Environmental Testing – Part 2-14: Tests – Test N: Change of Temperature

Scope: IEC 60068-2-14: Test N: Change of Temperature evaluates a product’s ability to withstand rapid or successive changes in temperature. It simulates environmental conditions where components may experience thermal stress due to sudden temperature transitions, such as moving from indoor to outdoor environments or exposure to cold water or rain. It is essential for assessing both mechanical integrity and functional performance under thermal cycling.

Applicable Products:
This standard applies to a wide range of components and systems, including:

• Electronic control units (ECUs)
• Sensors and actuators
• Battery systems
• Lighting and display systems
• Enclosures and mechanical assemblies
• Any product exposed to fluctuating thermal environments

Test Procedure: In our specialized test lab, we conduct IEC 60068-2-14 Test N: Change of Temperature using state‑of‑the‑art equipment to ensure accurate and reliable results. The test procedures include:

• Test Na – Rapid Change of Temperature (Air-to-Air): The specimen is transferred between two chambers or zones with fixed high and low temperatures. Transfer time is minimized (typically <1 minute) to create a thermal shock. Dwell times at each temperature are defined or developed to ensure thermal stabilization of air or part temperature. Commonly used for components that may experience sudden environmental changes.
• Test Nb – Gradual Change of Temperature (Controlled Rate): The specimen remains in a single chamber where temperature changes at a controlled rate (typically 1 K/min to 15 K/min). This method simulates more gradual environmental transitions. Ideal for evaluating stress from internal heating or slow ambient changes. Often used for larger or more sensitive components.
• Test Nc – Rapid Change with Liquid-to-Liquid or Air-to-Liquid Transfer: The specimen is rapidly transferred between two liquid baths or from air to liquid. This method creates extreme thermal shock and is used for highly robust components. Less common but critical for specific high-stress applications. This test ensures components can endure thermal shock and maintain functionality under real-world temperature variations.

End Result: Successful completion of IEC 60068-2-14 Test N: Change of Temperature confirms that the product can tolerate rapid temperature changes without compromising structural integrity or performance.

Lab Locations: Detroit (Plymouth), MI; Grand Rapids (Kentwood), MI

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