Fault

failure to reach or maintain a measured standard of reliability or performance. With respect to condition monitoring, additional terms relating to fault are:

OccurrenceAny detected or diagnosed fault requiring remedial action whether the action was reactive, preventive or proactive
Apparent Fault ConditionA diagnostic system reading indicates an abnormal condition, pending confirmation and evaluation of severity
True Fault ConditionAn apparent fault condition has been confirmed as a valid abnormal condition (by inspection, multi-technique cross checking, loss or variance in performance, etc.)
False AlarmAn apparent fault condition has not been confirmed or has been traced to an external cause (sampling or instrument error, misidentification, judgement error, etc.)

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