SRC Forum - Message Replies
Forum: Reliability & Maintainability Questions and Answers
Topic: Reliability & Maintainability Questions and Answers
Topic Posted by: Reliability & Maintainability Forum
Organization: System Reliability Center
Date Posted: Mon Aug 31 12:47:36 US/Eastern 1998
Posted by: Steven Pennington
Date posted: Thu Aug 15 21:02:52 US/Eastern 2002
Subject: Strain Gage Relaiblity
I need reliablity data, and screening methods for screening and providing a relaibity model for bonded foil strain gages.
Also we have some custom parts which have been grandfathered, which are a part of a screening program similar to space level quality but are custom. Can I use piQ for space quality parts?
One last question, what if the reports that where done for the last 25 years are wrong (misleading) and my company knows it?
Subject: Strain Gauge Screening
Reply Posted by: B.W.Dudley
Date Posted: Tue Aug 20 11:24:56 US/Eastern 2002
Since there are a number of technologies for strain gauge resistant devices such as metal film, thick film and semiconductor, I would suggest that you consider the testing parameters of the General Specification for Hybrids, MIL PRF-38534. Some of the strain gauge devices seem to have the characteristics of a hybrid, that is, active elements and passive resistive elements, so the testing levels in this specification for active and passive elements plus packaging appear to have merit.
With regard to the custom parts, if the screening levels used are consistent with the high quality requirements for space, then the space quality factor would be appropriate.