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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: Rushabh
Date posted: Mon Mar 5 15:13:43 US/Eastern 2007
Subject: Why failure rate of a capacitor is higher for non-operating vs operating condition
Message:
Can you please try to find the failure rate with 10% duty cycle ? I might be that for 0% duty cycle calculation there is some bug in software. Ideally what you pointed out is correct. Operating mode failure rate should be higher than Non Operating.


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Reply:

Ananya Subject: Response to David Dylis's question
Reply Posted by:
Date Posted: Mon Mar 5 16:42:19 US/Eastern 2007
Message:
Thank you for responding to my question. The capacitor type is chip ceramic (CDR). Details of both operating and non-operating conditions are given below:

Non-operating conditions:
Calculation Model:PRISM
Operating Temperature: -10C
Duty cycle : 0
Environment: GS, Ground Stationery
Operating Profile: Military Ground
Dormant Temperature: -10C
Relative Humidity: 40
Vibration Level: 0
Cycling Rate: 0
Process Grade: Part Quality Grade 3
Part Type: Capacitor, chip ceramic (CDR)
Year of Manufacture: 2005
Capacitance:0.1uF
Operating voltage: 0
Rated voltage: 50V
Voltage ratio: 0
Quantity: 12
Calculated failure rate of capacitor: 2.88774e-4
Calculated failure rate of system(in which there is only 1 component, this capacitor): 1.94387e-4

Operating conditions:
Calculation Model: PRISM
Operating Temperature: -10C
Duty cycle : 100
Environment: GS, Ground Stationery
Operating Profile: Military Ground
Dormant Temperature: -10C
Relative Humidity: 40
Vibration Level: 0
Cycling Rate: 1
Process Grade: Part Quality Grade 3
Part Type: Capacitor, chip ceramic (CDR)
Year of Manufacture: 2005
Capacitance:0.1uF
Operating voltage: 0.001
Rated voltage: 50V
Voltage ratio: 0.002
Calculated failure rate of capacitor: 0.000140
Calculated failure rate of system(in which there is only 1 component, this capacitor): 9.42406e-5


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