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Pastimes : Dream Machine ( Build your own PC )

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To: Dave Hanson who wrote (4158)	12/11/1998 1:11:00 PM
From: Sean W. Smith	Read Replies (2) of 14778

What manufacturers do is what we call device verification testing. We take a box and put it in a chamber and vary numerous parameters. Voltage +/- 10%, Freq +/- 10% and temperature usually 0 - 50C. We will only ship products that will function all the corners of those parameter ranges simulatneously. The purpose is A. simulate real word operating conditions. B. Have margin to allow the system yeilds to remain high when vendors change silicon processes. Silcon processes inherently vary a lot and the chips this week might be fast and next week slow. Vary the paramters above simulates these types of conditions without sampling tons of parts to ensure the plpatform you have built is robust and can be manufactured in quantity and will work in a variety of environments. A well designed PC the internal Temp should be no more than 10 def Farenheight above room temperature. Most people homebuilt PC's would fail these types of stress tests miserably. If your computer has an inexcess of 120 deg internal ambient temperature then you are definitely shortening the MTBF. Hope this makes sense. Sean

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