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MTBF calculation

  1. Jul 26, 2012 #1
    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?
  2. jcsd
  3. Jul 27, 2012 #2
    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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