Calculating MTBF with Polimore for Confused Users

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SUMMARY

The discussion centers on calculating Mean Time Between Failures (MTBF) using the Polimore tool. Users input individual subcomponents and their respective MTBFs to derive the overall system MTBF. When utilizing multiple identical components, such as five capacitors, users must consider whether to input each capacitor separately. If the capacitors are in series, they should be treated as a single component to accurately reflect the system's MTBF, as this configuration affects the overall failure rate.

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  • Understanding of MTBF calculations
  • Familiarity with Polimore tool functionality
  • Knowledge of series vs. parallel component configurations
  • Basic electronics principles related to capacitors
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This discussion is beneficial for engineers, reliability analysts, and anyone involved in system design and maintenance, particularly those working with electronic components and seeking to optimize MTBF calculations.

lcr2139
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I am confused as to how to calculate MTBF. I am using a website called Polimore, http://www.polimore.com/index.php?P=1000110&F=home.html I input all of the subcomponents of my system and their MTBFs and then I get the MTBF for the system. The thing I am confused of is what to do if I am using more than one of the subcomponents. For example, I am using 5 of the same capacitor. Do I input this capacitor 5 times? Will this change the MTBF at all?
 
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I would think any of the caps could fail, so wouldn't the MTBF decrease?

If there were a million caps, you'd have a million more ways it could fail, after all.

I would ask, however, are the caps in series? Perhaps you want to achieve a certain capacitance value otherwise unavailable?

If so, you might treat the stack as one cap (I am assuming the voltage rating of an individual cap is sufficient by itself, so a stack of 5 would see far less than supply voltage).
 

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