Good People A related question: Are vents on different sides of the test unit each blocked individually, or is the blocking of ALL vents considered the Single Fault Condition?
And, extrapolating from Mr Woodgate's comments on this thread, am I "gold-plating" safety tests? luck, Brian -----Original Message----- From: John Allen [ mailto:john.al...@era.co.uk] Sent: Thursday, September 18, 2003 1:49 AM To: 'Gibling, Vic'; 'drcuthb...@micron.com'; emc-p...@ieee.org Subject: RE: fan question Hi Folks In the days when I was testing professional disk/tape systems regularly for HP, I often gave them "a very hard time" by blocking the fan(s), sealing the enclosure slots with masking tape and then running the worst case duty cycle in a "test corner" until temperatures stabilised. Dependent on whether or not it stayed with the normal or abnormal limits I would then throw in the worst case component faults. Sounds very vicious, but is a good way of rapidly determining the weak points from a safety standards perspective, and you can then investigate these in more detail as required. If, however, there are no weak points then this approach substantially reduces the overall time for testing as you have effectively combined all the worst case tests into a much shorter test regime. Also a good pointer as to whether you might get reliability problems due to high ambient temperatures as if the equipment continues to function throughout then it gives you an idea of the operating margins in more "normal" conditions! John Allen Question: During a "locked fan rotor" test do other single-faults have to be invoked? Dave Cuthbert Micron Technology
