By Dhanasekharan Natarajan
This booklet explains reliability strategies with examples from electronics layout for the good thing about engineers. It provides the applying of de-rating, FMEA, overstress analyses and reliability development checks for designing trustworthy digital apparatus. sufficient info is equipped for designing automated reliability database method to help the applying of the recommendations through designers. Pedantic phrases and the linked arithmetic of reliability engineering self-discipline are excluded for the good thing about comprehensiveness and sensible functions. This booklet bargains very good help for electric and electronics engineering scholars and execs, bridging educational curriculum with commercial expectations.
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Extra info for Reliable Design of Electronic Equipment: An Engineering Guide
Quick acting and time lag fuses are available. The time-current characteristics of the fuses differ and the data sheets of manufacturers could be referred for details. Quick acting fuses are suitable for resistive load circuits. Time lag fuses are suitable for capacitive circuits, which are characterized by power-on inrush current. , operating the fuses at lower than the specified nominal current (In). In general, operating at no more than 75 % of nominal current is recommended . • The nominal current carrying capability of fuses decreases with increase in ambient temperature and the data sheets of fuse manufacturers could be referred for details.
5 for deriving the benefits of FMEA. 1 Failure modes of frequency modulator 37 Sl. No. 2 Failure Effect Failure effect is the undesirable consequence when the failure mode of an item occurs. The functions of an item are impaired by the failure effects of the item. One or more failure effects could be associated with one failure mode. ’’. Identifying failure effects is explained for one of the failure modes of the Frequency Modulator. 1. ’’. The failure effect on the Frequency Modulator is ‘‘distortion due to jittering’’.
1 Software Support Administrative efforts are required for performing FMEA. Software support is essential for minimizing the administrative efforts so that designers could focus on the technical aspects of FMEA. Software is used for documenting the outputs of FMEA and for deriving the benefits of the analysis. Excel tool with macros is adequate for COTS items such as SMPS and Control units but, FMEA software is required for electronic equipment. Provisions are also required to record the changes in FMEA without deleting previously recorded information as the design of equipment progresses.