Hi EMC-PSTC group, Some of Compliance Engineers in this group would be interested in Reliability tests. AST = Accelerated Stress Test. Barry ------------------- From: Bailin Ma <b...@anritsu.com>, on 11/10/99 4:09 PM:
Hi Harry, You said that STRIFE is HP's HALT. Actually there's a slight difference between HALT and STRIFE in my understanding. Please allow me to review three different limits before discussing the difference between HALT and STRIFE: (1) Specs limit, (2) Operating limit, and (3) Destruction limit. Let's take a printer for example. Assuming the operating temperature range of 0 to 50 C degree has been specified in your user's manual. But your printer still works well when raising the environment temperature from 50 all the way to 80 C degree. Then the printer couldn't work from 80 to 110 C degree. But it would go back to normal when reducing the environment temperature to the range of 0 to 50 C. After 110 C degree the printer would be permanently damaged and could not go back to normal any more. Now we may say that Specs limit = 50 C, Operating limit = 80 C, and Destruction limit = 110 C. In typical STRIFE, people test the printer over 50, then 80, and then usually stop somewhere between 80 to 110. In HALT, however, people won't stop until after 110. They have to know where both Operating limit and Destruction limit are. In conclusion, STRIFE is a subset of HALT. They are not the same thing Best Regards, Barry Ma Anritsu Company Morgan Hill, CA 95037 www.anritsu.com P.S. I usually heard of HASS (Highly Accelerated Stress Screening) and HALT (Highly Accelerated Life Test). Is HASA in your Email below the same as HASS, or you just misspelled it? ---------- Original Text ---------- From: "McLean, Harry" <harry.mcl...@attws.com>, on 11/9/99 1:47 PM: At HP, we used a dedicated test platform on Unix for driving our printers in HASA as well as in STRIFE (HP's HALT). This worked well but required that a dedicated (contract) programmer be allocated every time a new printer was designed. This was a very high volume environment and a new printer was developed about every three months. At AT&T we use LabView as the test platform to access on board diags. This si VERY time consuming and at least two individuals are writing LV full time. The results are just as good as the HP results. Our volumes to date are moderate and should reach very high volume early in 2K. We average a HALT every three weeks. I have run a very large number of HALTs in which data acquisition was done manually. The results were just as good as the two cases above but this does require one to pay close attention and to be accurate in data reading and writing. As you can see all three methods work well it just depends on how you want to get there. I understand that QualMark is offering test development as a business to support HALT. You may want to contact Ann Marie (I've included her on the distribution list). Her phone is (303) 254-8800. ---------- From: Morelli, Mark[SMTP:mark.more...@otis.com] Sent: Tuesday, November 09, 1999 11:10 AM To: 'accelerated-stress-test...@majordomo.ieee.org' Subject: Data acquisition for AST The Test Engineering organization at my company is attempting to improve the process used to specify the data acquisition equipment used in design AST such as HALT and temperature/humidity cycling tests. In the past we have primarily used in-house designed/built systems controlled by PCs using custom Visual Basic or Labview software programs and associated hardware depending on the type of signals being recorded. We are finding this approach, which requires significant human resources, can not keep with our test volume, which is about one new HALT and one temp/humidity test per week. I would like to explore all possible options including outsourcing the design/fab of data acquisition systems or performing some of the tests at outside labs. If the members of this e-mail group could suggest the approach that has worked best for you I would appreciate it. In addition, we may want to benchmark organizations to help in the improvement process. Thanks, Mark L. Morelli [mailto:mark.more...@otis.com] Sr. Reliability Engineer Otis Elevator Co. Farmington 860-676-6140 ______________________________________________________________ Open your mind. Close your wallet. Free Internet Access from AltaVista. http://www.altavista.com --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
