[Appendix NB] - The latest low temperature test chamber standard GB/T 2423.1-2008
Test A: Low Temperature and Test B: High Temperature – The relationship between the lower-case letters in the high temperature classification code is illustrated in the table below:
| Suffix Letter | Test A: Low Temperature | Test B: High Temperature |
|---|---|---|
| a | Abolish | Abolish |
| b | Non-heating | Non-heating |
| Gradient | Gradient | |
| High speed (priority) | High speed (priority) | |
| c | Abolish | Abolish |
| d | Heat dissipation | Heat dissipation |
| Gradient | Gradient | |
| Low speed (priority) | Low speed (priority) | |
| e | Cooling, energizing the entire test process | Cooling, energizing the entire test process |
| Gradient | Gradient | |
| Low speed (priority) | Low speed (priority) |
This appendix provides detailed guidelines for low-temperature testing of electrical and electronic products according to the GB/T 2423.1-2008 standard. It outlines different test conditions based on the suffix letters, which define the environmental parameters such as temperature change, air velocity, and whether heating or cooling is applied during the test.
The classifications help manufacturers and testers select the most appropriate test method depending on the product's characteristics and intended use. For example, "b" indicates a non-heating condition with a temperature gradient and high-speed airflow, while "d" involves heat dissipation with a slower airflow. The "e" classification requires continuous cooling and power supply throughout the test, making it suitable for sensitive equipment that must remain operational under extreme temperatures.
Understanding these classifications is crucial for ensuring accurate and reliable testing results. Proper adherence to the GB/T 2423.1-2008 standard helps maintain product quality and performance under various climatic conditions.
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