Chris Johnson, Index
The Basics: Hardware Management
Must consider during hardware acquisition:
- Operating Temperature Range - parts should be selected which are rated
operating temperature range to which they will be subjected.
- Electrical Characteristics - parts should be selected to meet EMI,
waveform and signal requirements and maximum applied electrical stresses
and in combination).
- Stability - parts should be selected to meet parameter stability
requirements based on
changes in temperature, humidity, frequency, age, etc.
- Tolerances - parts should be selected that will meet tolerance
tolerance drift, over the intended life.
- Reliability - parts should be selected with adequate inherent
reliability and properly
derated to achieve the required equipment reliability. Dominant failure
be understood when a part is used in a specific application.
- Manufacturability - parts should be selected that are compatible with
manufacturing process conditions.
- Life - parts should be selected that have "useful life" characteristics
(both operating and
storage) equal to or greater than that intended for the life of the
equipment in which they
- Maintainability - parts should be selected that consider mounting
provisions, ease of
removal and replacement, and the tools and skill levels required for
- Environment - parts should be selected that can operate successfully in
environment in which they will be used (i.e., temperature, humidity,
sand and dust, salt
atmosphere, vibration, shock, acceleration, altitude, fungus, radiation,
corrosive materials, magnetic fields, etc.).
- Cost - parts should be selected which are cost effective, yet meet the
performance, reliability, and environmental constraints, and life cycle
- Availability - parts should be selected which are readily available,
from more than one
source, to meet fabrication schedules, and to ensure their future
availability to support
repairs in the event of failure.