Introduction to the Usage Standards and Specifications of Temperature and Humidity Cyclic Test Chambers

To ensure the accuracy and scientific rigor of tests conducted with temperature and humidity cyclic test chambers, relevant industries and testing procedures typically adhere to certain national and international standards. These standards regulate test methods, equipment performance metrics, and define testing conditions and environmental requirements. Below are the primary usage standards and specifications commonly applied to such equipment:

1. Domestic Standards

   • GB/T 10586-2006 "Technical Conditions for Environmental Testing Equipment": Specifies the fundamental technical requirements for environmental testing equipment, including performance criteria and testing methods for temperature and humidity cyclic test chambers. It is a widely recognized technical standard in China.
   • GJB 150.3-86 "Technical Conditions for Cyclic Damp Heat Test Chambers": A military standard that details the technical parameters and performance testing of cyclic damp heat test chambers, particularly applicable to environmental adaptability assessments for military products.
   • GB/T 2423.3-2006 "Environmental Testing for Electric and Electronic Products – Part 2: Test Methods – Test Ca: Damp Heat, Steady State" and GB/T 2423.4-2008 "Cyclic Damp Heat Test": Provide strict guidelines for damp heat testing methods for electrical and electronic products.

2. International Standards

   • IEC 60068-2-78 "Environmental Testing – Part 2-78: Tests – Test Cab and Cb: Damp Heat, Steady State" and IEC 60068-2-30 "Cyclic Damp Heat Test": Widely adopted in the electronics, telecommunications, and industrial equipment sectors, these are globally recognized standards for environmental testing methods.
   • MIL-STD-810G: A U.S. military standard emphasizing environmental adaptability testing under extreme climatic conditions, including temperature and humidity cyclic tests. It is commonly used in military and aerospace applications.
   • ISO 16750-4 "Road Vehicles – Environmental Conditions and Testing – Part 4: Damp Heat and Cyclic Damp Heat Testing": A standard widely applied in the automotive industry to evaluate the environmental resilience of vehicle electronic components.
     

3. Testing Environment and Parameter Settings
   Depending on product standards and customer requirements, parameters such as temperature, humidity, rate of change, and duration within the test chamber are configured according to the procedures specified in the above standards. Common test cycles include:

   • Steady-State Damp Heat Test: Maintains a set high-temperature and high-humidity environment (e.g., 85°C/85% RH) for a specified duration to assess the product's resistance to damp heat.
   • Cyclic Damp Heat Test: Simulates repeated thermal and humidity shocks in real-world environments through periodic temperature and humidity variations, evaluating the product's adaptability and stability.
   • Condensation Test: Examines the impact of moisture condensation on product performance under dew point conditions.

4. Equipment Acceptance and Calibration
   To ensure the reliability of test data, temperature and humidity cyclic test chambers typically undergo rigorous performance acceptance checks and periodic calibration after installation, in compliance with national metrological standards. Standard temperature and humidity sensors are often used to verify measurement accuracy and ensure uniformity meets regulatory requirements.

5. Operational Guidelines and Safety Requirements

   • Personnel Training: Operators should be familiar with the equipment's structure and control systems, strictly following the user manual to minimize deviations or equipment damage caused by improper operation.
   • Environmental Conditions: The test chamber should be placed in a well-ventilated area free from strong magnetic fields and corrosive gases to avoid external interference with test results.
   • Safety Measures: The equipment must be equipped with standard safety protections, such as water shortage protection, over-temperature protection, and power failure protection, to ensure safe operation.