CLI 540 - Fundamentals of Climatics Testing, ESS, HALT & HASS
Brief overview for management and participants
Classical approach to thermal environmental testing - simulation
Purpose of environmental testing during development
Temperature testing
- Test requirements – sources and applications
- Test equipment
- Chambers –heating, cooling and control
- Instrumentation: sensors, readouts, recording
- Setting up for a typical test
- Test item preparation
- Conducting the test
- Recording of data
- Data reduction and interpretation
The following 11 topics have similar subtopics:
- Temperature shock testing
- Altitude testing
- Humidity testing
- Solar radiation testing
- Rain testing
- Immersion testing
- Icing/Freezing rain testing
- Fungus testing
- Salt fog testing
- Sand and Dust testing
- Explosive atmosphere testing
Purpose of HALT - highly accelerated life testing
Purpose of environmental stress screening (ESS) as production step
- Initially 100%; later sampling
- Commonly-used tools: thermal ramping and random vibration
- Importance of rapid thermal ramping
- Opportunity to determine and extend limits during product development
Determining and extending limits - stimulation
- HALT - highly accelerated life testing during product development
- HASS - highly accelerated stress screening (post production)
- ESS - Environmental stress screening of electronics hardware production
- Philosophical differences from testing - stimulation vs. simulation Multiple- vs. conventional single-axis-at-a-time vibration
- Conventional single-axis
- Mechanical and pneumatic repetitive shock (RS) stimulators
Attachment fixtures; vacuum hold-downs
Summary of course for management and participants
