High-Acceleration Life Test (HALT)
HALT (Highly Accelerated Life Test) stands for Highly Accelerated Life Testing, a testing methodology that employs environmental stresses even more severe than those used in conventional accelerated life tests. Primarily employed during the product development phase, HALT can rapidly reveal design and manufacturing defects, providing valuable insights to guide design improvements and enhance product reliability.
Test Method
1. Test scope: Full‑function operation under standard conditions, covering all interfaces, buttons, communication, display, and other functions, while recording temperature‑rise data for key components (e.g., chips, capacitors).
2. At the target high and low temperatures, monitor the temperature at key points on the product’s surface and inside; verify compliance with the specified requirements (e.g., temperature difference ≤ ±2°C). If deviations exceed the allowable limits, adjust the sample or catheter position—such as relocating the sample closer to the airflow duct—until the temperatures at all measurement points within the chamber are uniformly balanced.
3. Temperature Step Test: Low Temperature: Start at room temperature, reduce the temperature by 5–10°C each step or as specified in the relevant standards, maintain each steady state for 5–20 minutes, and then assess functionality until a failure occurs; High Temperature: Similarly, increase the temperature by 5–10°C each step until component deformation or functional failure is observed.
4. Thermal Cycling Test: Define the upper and lower temperature limits (e.g., +125°C and −40°C) as the start and end points, and perform rapid thermal cycling. The test duration shall be 5 to 20 minutes after the temperature at each measurement location of the test specimen has stabilized, or as specified in the relevant standards. Typically, the number of cycles should be five or more.
5. Vibration Testing: The standard recommends starting with a relatively mild vibration level of 5 g RMS to 10 g RMS, using a step increment of 5 g RMS. At each selected vibration level, first apply continuous vibration for at least 10 minutes (or as specified in the relevant standard). After completing one “vibration‑test” cycle at that level, increase the vibration level by the prescribed step size (e.g., 5 g RMS). Continue raising the vibration level and repeating the cycle until the product experiences complete failure or loss of functionality.
6. Combined Stress: Introduce stepped vibrational stress during each rapid temperature‑change cycle to simulate real‑world, complex environmental conditions. The initial vibration amplitude may be set to one‑fifth of the operational vibration limit, with five or more cycles.
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