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1990-04-13
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Select Environment/Component Quality.
RELIABILITY PREDICTOR's database contains failure rate data for
component types in each of 3 operating environments :
GROUND BENIGN
Ambient temperature range of 0 to 50 degrees Celsius with no vibration
This corresponds to the environment experienced by the majority of
commercial products.
endpage$
GROUND FIXED
Similar to Ground Benign but with an extended temperature range of
-20 to +70 degrees Celsius. This environment is typical of that
experienced by products intended for industrial applications.
GROUND MOBILE
This is the most severe environment with a temperature range of
-50 to +125 degrees Celsius. The product is also assumed to be in a
mobile application e.g. automotive and therefore regularly subjected
to vibration in operation.
endpage$
RELIABILITY PREDICTOR calculates overall failure rates depending upon
the quality level of components used. The default component quality is
selected from one of three types :
COMMERCIAL QUALITY
This quality level is appropriate to components purchased to normal
commercial standards where no special screening is applied. In general
it will apply to all devices housed in plastic packages. It is
equivalent to quality level D-1 as defined by MIL-HDBK-217E.
INDUSTRIAL QUALITY
This quality level is more appropriate to components required to
operate in industrial environments (e.g. Ground Fixed). Components
in this category are usualy supplied in hermetic packages. It is
equivalent to quality level D as defined in MIL-HDBK-217E.
endpage$
MILITARY QUALITY
This quality level corresponds to components which meet the
requirements of paragraph 1.2.1 in MIL-STD-883 and is defined as
quality level B-1 in MIL-HDBK-217E.
The default setting can be over-ridden for an individual component type.