HASS (Highly Accelerated Stress Screening) Testing Services
Highly Accelerated Stress Screening is a production screening technique that is very useful for identifying manufacturing issues, problems, and process monitoring. The right application of HASS testing can shorten screening times and costs, enhance process management, and boost overall quality.
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- Overview
- Scope, Applications, and Benefits
- Test Process
- Specifications
- Instrumentation
- Results and Deliverables
Overview
Highly Accelerated Stress Screening (HASS) is a production-phase reliability method in which units undergo various levels of thermal and vibration stress to induce latent defects, thereby detecting them before they leave the production floor for customers. HASS stress profiles are derived from HALT and operate within defined product limits, ensuring defective units are detected without depleting the life of good units.
HASS is used across various industries, including electronics, aerospace, defense, automotive, and industrial equipment, where reliability is a major concern. HASS is used alongside HALT, where design margin is converted into a repeatable production-quality tool, thereby detecting defects such as solder joint defects, marginal components, and assembly defects that would otherwise pass visual inspection.
Scope, Applications, and Benefits
Scope
HASS covers production-phase stress screening of electronic and electromechanical assemblies using combined thermal and vibration environments derived from HALT qualification data.
- Stress profiles defined within operational limits established during HALT
- Combined thermal cycling and multi-axis vibration applied simultaneously
- Proof of screen (PoS) required to validate profile effectiveness before production use
- Applicable to PCBs, electronic assemblies, sensors, power supplies, and electromechanical devices
- Covers 100% production screening or statistically defined batch screening
- Supports ongoing production quality monitoring and supplier screening programmes
Applications
Electronic assemblies and PCB systems
Automotive components
Aerospace and defense equipment
Consumer electronics
Industrial control systems
Benefits
Removes early-life failures (infant mortality)
Improves product reliability and consistency
Reduces warranty and field failures
Enhances customer satisfaction
Supports continuous manufacturing improvement
Test Process
Pre-Screen Inspection
Products are checked to ensure proper functionality before screening.
1Controlled Stress Application
Products are exposed to temperature cycling and vibration within predefined safe limits.
2Monitoring and Detection
Units are monitored for failures or defects during stress application.
3Screening Outcome
Defective units are removed, and passed units proceed to final delivery.
4Technical Specifications
| Parameter | Details |
|---|---|
| Stress Factors | Temperature (high/low), rapid thermal cycling, vibration |
| Temperature Range | Typically -50°C to +150°C |
| Vibration Range | Multi-axis random vibration (several Grms) |
| Test Approach | Controlled stress screening based on HALT limits |
| Measured Output | Measured Output |
| Environment condition | Environment |
Instrumentation Used for Testing
HASS Chamber
Temperature Control Unit
Multi-Axis Vibration Table
Monitoring Sensors
Data Acquisition System
Results and Deliverables
Identification and removal of defective units
Screening pass/fail results
Reliability improvement data
Process validation insights
Detailed HASS screening report
Frequently Asked Questions
HASS is a production screening method that applies controlled environmental stresses to detect and eliminate manufacturing defects, ensuring only reliable products are delivered to customers.
HASS is used in production for defect screening, while HALT is used during development to find design weaknesses and determine stress limits.
The main purpose is to detect early-life failures and manufacturing defects, improving overall product reliability and quality.
Factors include stress levels, duration, product design, and correct setup of screening parameters.
HASS cannot detect design flaws and relies on proper HALT data; incorrect stress levels may reduce effectiveness or risk damaging good products.
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