IEC 60068-2-2: Environmental Testing – Part 2-2: Tests – Test B: Dry Heat

Overview and Purpose

IEC 60068-2-2 is part of the IEC 60068 environmental testing series, focusing specifically on the dry heat testing of electronic equipment. This standard outlines the procedure for determining the ability of components, equipment, or other items to be used, transported, or stored at high temperatures. Test B: Dry Heat is designed to simulate the effects of high temperatures on the specimen in a non-condensing (dry) environment, assessing its performance in terms of physical and chemical stability, as well as mechanical functionality.

How the Test is Conducted

1. Preparation: Specimens are prepared according to their operational instructions, ensuring they are in the appropriate state for testing. This preparation might involve setting the equipment to a specific operational mode or condition.
2. Temperature Exposure: The specimen is placed in a controlled test chamber where the temperature is increased to the specified level for the test. The temperature levels and the duration of exposure are based on the product’s intended operational environment and the specific requirements outlined in the standard.
3. Stabilization Period: After reaching the test temperature, the specimen is maintained at this level for a predetermined period to ensure full exposure. This period allows for the assessment of both immediate and long-term effects of dry heat on the specimen.
4. Recovery and Evaluation: Following the exposure period, the specimen is allowed to return to normal ambient temperature conditions for recovery. It is then evaluated for any evidence of damage or degradation in performance. Evaluation methods include visual inspections, functional tests, and measurements of electrical and mechanical properties.

Purpose of the Standard

• High-Temperature Performance: Ensures that electronic components and equipment can withstand and operate effectively under high-temperature conditions, crucial for products used in hot climates, near heat-generating devices, or in applications where cooling is limited.
• Design Improvement: Identifies potential issues related to high-temperature performance during the design and development phases, allowing for necessary design adjustments.
• Quality Assurance: Serves as a critical component of quality assurance processes, confirming that products meet international standards for high-temperature operation.
• Market Confidence: Provides consumers and businesses with confidence in the reliability and performance of products when used in high-temperature environments.