Forum: Reliability & Maintainability Questions and Answers

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Posted by: Leroy Meyers (meyers@generalatronics.com )
Organization:GAC
Date posted: Wed Apr 12 8:57:03 US/Eastern 2000
Subject: 217 Quality Factors
Message:
For a microcircuit purchased to a Standard Military Drawing (SMD), what is the most accurate Quality Factor to use for these 2 device classes:
Device class M: Vendor self-certification to the requirements for MIL-STD-883 compliant, non-JAN Class Level B microcircuits in accordance with MIL-PRF-38535, Appendix A. Device class Q or V: Certification and qualification to MIL-PRF-38535. Would class M be considered B-1 with a quality factor of 2 and class Q or V be considered B with a quality factor of 1?

Replies:
Quality Factors
Bruce Dudley Wed Apr 12 14:27:58 US/Eastern 2000

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Posted by: Peter Jolly (peter.jolly@carrier.utc.com )
Organization:Carrier Refrigeration
Date posted: Thu Apr 6 23:44:07 US/Eastern 2000
Subject: Rebaility Data for Electric Motors and Compressors
Message:
I am working on a project to reduce product qualification time. I am looking at accelerated life cycle testing techniques. I am seeking data(MTBF or Weibull beta's and eta's) on electric motors (DC, BLDC, Induction and SR, all <1 hp) and compressors. Any papers referring to the physics-of-failure would also be useful. Thanks

Replies:
Electric Motor Life Testing
Bruce Dudley Wed Apr 12 9:18:44 US/Eastern 2000

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Posted by: Jean-Marie Cloarec (Jean-Marie.cloarec@ligeron.com )
Organization:LIGERON S.A.
Date posted: Thu Apr 6 8:10:22 US/Eastern 2000
Subject: RADC TR 85-91
Message:
Is the RADC TR 85-91 still in use, or was it updated ?
Has somedy a copy of it ?

Replies:
RADC TR 85-91
Jack Farrell Fri Apr 7 11:06:29 US/Eastern 2000

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Posted by: Chua Peck Seng (cpecksen@dso.org.sg )
Organization:DSO National Laboratories
Date posted: Wed Apr 5 23:26:23 US/Eastern 2000
Subject: Reliability Test
Message:
May I know what are the reliability test to verify that a module can withstand intermittment operation at 50 degC for a life cycle of 8 yrs ?

Replies:
Reliability Testing
Bruce Dudley Wed Apr 12 15:45:31 US/Eastern 2000

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Posted by: COLLIN Jean-Philippe (Jean-Philippe.Collin@ligeron.com )
Organization:LIGERON SA
Date posted: Wed Apr 5 11:36:08 US/Eastern 2000
Subject: relation between failure rate and lifetime
Message:
Who evaluate failure rate of components of a black box make s of a relay and electronic components when we have only the lifetime of the components as 200.000 operations ?

Replies:
relation between failure rate and lifetime
Jack Farrell Fri Apr 7 10:00:16 US/Eastern 2000

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