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

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