Forum: Reliability & Maintainability Questions and Answers

Topic: Reliability & Maintainability Questions and Answers

Topic Posted by: Reliability & Maintainability Forum (src_forum@alionscience.com )
Organization: System Reliability Center
Date Posted: Mon Aug 31 12:47:36 US/Eastern 1998

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Original Message:

Posted by: John (kelsmit@aol.com )
Date posted: Sun Sep 9 21:40:53 US/Eastern 2001
Subject: Plotting Reliability
Message:
When plotting cumulative MTBF vs. Time for multiple units, (sample size is 12, with 2000 hours on each unit)what rules of thumb should be used for selecting the time interval to calculate the MTBF. The shape of the curve will change depending on this time interval (t = 100, 500, 1000, ... vs. t = 50, 100, 150, 200, ...)? t = 100 means each of the 12 units has 100 hours on it, so the total hours is 1200 hours. I have seen the term instantaneous MTBF, what is this used for and can this be calculated from my data? Thank you. John

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