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Module
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Affected Calculations
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Fault Tree
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Probability results differ if small values are entered for Exposure Time Percentage and/or Failure Rate Percentage.
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Prediction
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On the Reliability Prediction page in the Calculate window, Mission Profile defaults to the first profile in the Mission Profile file. A mission profile must be selected, even if Mission Calculations on this page is cleared. The value for it is then used as the mission time for the various calculations that use it.
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RDF 2000 and IEC TR 62380 model results differ.
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Dormant failure rates are no longer calculated for parts with specified failure rates or MTBF values. This applies to parts where the failure rate is set in the General Data window. It does not apply to parts that are unsupported by the selected model and have a failure rate entered for the part on its Prediction Data window.
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For allocated parts and assemblies, the MTBF or reliability fields are always updated when the failure rate is updated.
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When using the AGREE allocation method, lowest-level items now display a failure rate.
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When using a Telcordia or Bellcore model, hybrid parts now support all environments supported by the model. Previously only Bellcore 4 environments worked with any Telcordia or Bellcore model.
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When using the Telcordia Issue 1 or Issue 2 model, Pi factors now show before the calculation so that you can see the lambda g value specified in the standard.
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When using the Telcordia Issue 1 or Issue 2 model, computer subsystem parts are no longer affected by Pi E or any other Pi factor. The numbers from the standard are used as the final failure rates and no adjustments are made.
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When using the Telcordia Issue 1 model, the number of contact pairs is not taken into account for the failure rate of switches.
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When using the IEC TR 62380 model, if Surface Mounted Device is selected, results may differ.
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OpSim
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Simulated results differ. Additionally, blocks with non-zero logistics time are analytically calculated if their Failure, Logistics Time, and Repair distributions are all exponential. A Markov model is used rather than simulation.
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