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Contaminants and Moisture can Disrupt your
Electronics
(course CON 501)
- Overview
- Brief examination of the effects
of canceling the "how to test" MIL Standards; replacements
- Fallacies involved in reliability
prediction
- Generally limited to component
failures
- Poor documentation of intermittent
or "soft" failures and No-Fault-Found issues
- Lack of root cause information
regarding failures
- Performance Based Specification
(PBS) concepts
- DoD 5000.2-R - Department
of Defense procurement requirements document
- "Top - down" lines of communication
- Long term reliability of
COTS (Commercial Off The Shelf, non-developmental military hardware)
- Contamination types and sources
found in manufacturing and found in end-use environment
- Manufacturing/process contamination
- case histories
- Operational environment contamination
- case histories
- Measurements of contamination
levels on circuitry, at the factory and at depots close to point of
use.
- Ion chromatography
- ROSE and Modified ROSE (Resistivity
Of Solvent Extract)
- FTIR (Fourier Transform Infrared
Spectroscopy)
- SEM (Scanning Electron Microscope)
- SIR (Surface Insulation Resistance)
- Electrochemical Migration
- Effects of combining moisture
+ temperature + contamination + vibration + thermal stressing
- Why better than single environments
- How to combine test environments
- Types of field and laboratory
failures
- Intermittent and/or "soft"
failures
- "Hard" failures of circuitry,
of polymers, of wiring and of connectors
- Effect on survivability of
"power-ups" during combat and/or field deployment
- Mission readiness and completion
- Equipment "longevity"
- Types of tests, their goals
and their limitations: HALT, ESS, HAST, HASS, etc.
- Finding realistic failure
modes
- Protocols that "mask" failure
modes
- Methods of tailoring lab tests;
what to measure (and when to do it) during tests
- MIL-STD-810F
- Multi-channel monitoring
- Testing to determine effectiveness
of production conformal coatings and other forms of protection.
- Polymers - Permeability plus
changes in electrical and mechanical properties
- Elastomers - Permeability
plus changes in electrical and mechanical properties
- Practical exercises in test
tailoring
- Infant mortality
- Long term reliability
- Summary
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