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an introduction to reliability
fitting curves to failure patterns
17 other sections not shown
90 per cent achieve active redundancy actual reliability automatic test equipment batch bath tub curve calculate capacitors cause Chapter confidence level consider constant failure rate cost decide DISCOUNTED CASH FLOW discussed in section early failure period electrical ensure equation estimate example exponential distribution factory fail safe failure occurs failure pattern failure probability density fault follows frequency distribution curve Hence installation instant lamps machine maintenance action manufacture mean mechanical meter MTBF necessary Normal distribution Normal frequency distribution number of failures operating characteristic overall Pareto distribution particular performance and reliability plot possible practice predict probability density function production quality control quality engineer random failures rectifiers reliability engineers reliability is better repair replace resistors sample satisfactory scale scheduled maintenance selenium shown in Fig specification standard deviation supplier Suppose survive test equipment Total number usually voltage wear out failure Weibull distribution