Forum: Reliability & Maintainability Questions and Answers

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Posted by: IC
Date posted: Thu May 2 10:40:07 US/Eastern 2002
Subject: Prism V's the Rest
Message:
What are the benefits of using the PRISM Software against those from Relex or Isograph (or similiar)for the purpose of obtaining failure rates?
I would appreciate any views or comments that anybody has regarding this. Thanks in advance

Replies:
PRISM vs. commercially available prediction tools...
David Dylis Thu May 2 16:33:18 US/Eastern 2002

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Posted by: Roger Pawlowski (rogerp@spectracomcorp.com )
Organization:Spectracom Corporation
Date posted: Tue Apr 30 17:03:47 US/Eastern 2002
Subject: GPS and Loran C availability
Message:
Does anyone have or know where to get goverment published GPS and Loran C avaiability numbers? Jamming not considered, only basic system availability.

Replies:
GPS and Loran C availability
Nathan Holzhauer Wed May 22 13:29:21 US/Eastern 2002

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Posted by: Robert Webb (rob.webb@uecd.co.uk )
Organization:Ultra Electronics, Controls Division, UK
Date posted: Mon Apr 29 8:57:40 US/Eastern 2002
Subject: Up-rating
Message:
I am seeking advice on up-rating to extend the operating temperature range of an equipment beyond that specified for individual components used. Is it an acceptable method to up-rate by functionally testing the equipment at the extended range, and not to individually test components at the extended range? Can you also please advise of any other sources of guidance on this subject.
Regards Robert Webb

Replies:
Up-screening
B.W.DUDLEY Tue Apr 30 14:06:42 US/Eastern 2002

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Posted by: B.G.Hebalkar (Bhalchandra.G.Hebalkar@cummins.com )
Organization:Cummins India Limited
Date posted: Mon Apr 29 1:55:04 US/Eastern 2002
Subject: Reliability predictions
Message:
I have a failure data for a component as follows(failed hours) 1,574,611,887,1250,1445,2480,2750,3234,3540,3900,4001,4124, 4180 and 4189 hours
I calculated the relibility of this part using this failed data after plotting manually on weibull plot as 0.112 considering 5000 hours Warranty life. But how can I derive the actual reliability of this component as already some 10000 components are running in field and have already crossed 5000 hours which is our warranty life. Please advice me the appropriate formula to get the actual reliability of this component. Thanks,

Replies: (list all replies)
Weibull Analysis
Patrick Hetherington Mon Apr 29 7:04:13 US/Eastern 2002
Nonparametric Analysis
Larry George Sat May 4 15:54:04 US/Eastern 2002

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Posted by: Joc Delarche (jocdelarche@yahoo.fr )
Date posted: Fri Apr 26 4:59:44 US/Eastern 2002
Subject: Weibull parameter for MTBF
Message:
Dear all,
I need to do a MTBF for an electronic application. If I use the NPRD-95 book, I need to know the Weibull parameter for each component. How can I find this parameter or how can I calculate it from Data sheet components ?

Replies:
Weibull Parameters
Patrick Hetherington Fri Apr 26 7:06:48 US/Eastern 2002

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