

      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.

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      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.
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   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.

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      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.
