Forum: Reliability & Maintainability Questions and Answers

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Posted by: Katell Cadoret
Date posted: Fri Sep 21 9:01:39 US/Eastern 2001
Subject: Aging factor / electronic ship
Message:
I'd like to have some informations about aging tests on electronic ship as ASIC. In fact I want to know if it's better to consider an aging with temperature or with frequency. With temperature as aging parameter, it's difficult for me to solve the arrhénius equation because i have no idea of the ship energy activation. where can i find such an information. My problem is in fact to determine the aging factor in order to be able later to correlate the test results with reality.
Can frequency that pilots the ship be a good aging parameter ? if frequency is multiplied by two, is that meaning that the ship lifetime is divided by 2? if somebody has some informations about this, thank you very much ! Bye, Katell

Replies:
Aging Factor
B. W. Dudley Thu Oct 4 13:48:35 US/Eastern 2001

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Posted by: Peter Kirchhofer (peter.kirchhofer@jaquet.com )
Organization:JAQUET Ltd
Date posted: Fri Sep 21 8:31:59 US/Eastern 2001
Subject: Microphonic Effect of SMD Ceramic Capacitors
Message:
Problem: An FM demodulator printed circuit board produces an output signal, when the board is vibration tested on a shaker or if it is hit with any hard plastic tool. Mechanically decoupling the relevant capacitors fixes the problem, but this is an expensive solution.
Question: Does anybody know about the related dielectric characteristics (e.g. capacity change vs pressure) for different capacitor dielectrica ?

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Posted by: Jim Jones (jcjones@link.com )
Organization:L3 Communications
Date posted: Wed Sep 19 11:48:51 US/Eastern 2001
Subject: Laserjet Printer MTBF
Message:
I am looking for the MTBF of Color LaserJet Printers and have not found any reference to LaserJet MTBF calculations. Even the calculation for a monochrome LaserJet would be beneficial. Thanks in advance!
Jim Jones

Replies:
Laser Printer MTBF
Bruce Dudley Wed Sep 19 13:37:52 US/Eastern 2001

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Posted by: Diane Gordon (info@reliability.com )
Organization:Reliability Center, Inc.
Date posted: Wed Sep 19 10:23:29 US/Eastern 2001
Subject: Physical Properties of Polypropylene
Message:
What are the effects of variation in processing (mold temperature, material temperature, clamp pressure etc.) on the physical properties of polypropylene?

Replies:
Polypropylene Variables
B.W.Dudley Wed Sep 19 14:34:52 US/Eastern 2001

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Posted by: Diane Gordon (info@reliability.com )
Organization:Reliability Center, Inc.
Date posted: Fri Sep 14 9:18:53 US/Eastern 2001
Subject: Defining a Critical Equipment List for a Chemical Process Plant
Message:
Is there any aid on defining a critical equipment list for a chemical process plant? I'm thinking of books, software, websites, etc.
Thank you.

Replies:
Criticality
Jean-Marie CLOAREC Fri Oct 19 7:05:12 US/Eastern 2001

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