HALT Testing (Highly Accelerated Life Testing) is a highly aggressive temperature and vibration cycling process which is used very early in the design stage of the product life cycle.
Anecto use a Qualmark HALT chamber which has omni axial random vibration capability and good rapid thermal transition capability. The HALT test itself starts with Hot and Cold Temperature Stress testing followed by rapid temperature transitions. This is followed by vibration step testing. The operating and destruct limits will have been determined during this period of the HALT. Then, using the these limits to define parameters of the final step, combined vibration and temperature cycling is performed. The product under test will always be powered, fully exercised and functionally tested during the HALT process.
HALT – Margin Discovery Process
Why do HALT?
- HALT testing at the beginning of the design cycle has been proven to save money in terms of:
- Speed to market – Having performed HALT testing, validation testing towards the end of the life cycle is more likely to be a shorter process as design weaknesses will have already been identified and hopefully eliminated from the design.
- Significantly reducing potential field failures by highlighting design weaknesses early in the process where they can be easily addressed and rectified
- You get to quantify your upper and lower operating limits and design limits.
HASS Testing (Highly Accelerated Stress Screen)
HASS testing is a proven screening method developed to find manufacturing and production process induced defects in electronics and electro-mechanical assemblies. After a product has previously undergone HALT, HASS can be deployed as a very effective test methodology.
The HASS test uses the highest possible stresses (which will have been determined during HALT), to induce weaknesses in the product post production before being released into the field.
HASS Screening Curve:
Why do HASS?
- HASS testing saves money by screening out defects which may otherwise cause product failures in the field.
- HASS is low cost in comparison to other screening methodologies because much less equipment is necessary (shakers, chambers, monitoring systems, power and liquid nitrogen) due to time compression in the screens.
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Case Study – Emerson Network Power
How Anecto developed a number of innovative solutions for the leading multinational Emerson Network Power.