The severity of a life test depends on the field environment. I work in automotive powertrain. Our standard design validation of 85/85 for 1000hrs may not even be severe enough to simulate underhood conditions for 10 years/150,000 miles. ---------- > From: SIRGuru <[log in to unmask]> > To: [log in to unmask] > Subject: Re: [TN] Re[2]: [TN] SIR Reading > Date: Thursday, January 08, 1998 9:43 AM > > In a message dated 98-01-06 21:08:26 EST, you write: > > > Is it a normal practice to run the SIR test for 40 days (1000hr)? Is > > so, usually after how long do you see a decrease in SIR? > > It depends on what you consider normal. I know that many companies do 1000 > hour tests as a "life" test. Bellcore electromigration is 500 hours at 85/85, > which is the longest "SIR" type of test that is commonly run in our lab. In > my own opinion, I don't consider an SIR test longer than 10 days at 85/85 to > be particularly meaningful. If you are testing at lower extremes, say 35/90, > then you may be able to go longer and still get meaningful results. Whether > or not you see a decrease in SIR depends on a number of factors, primarily the > types of ionic or hydrophilic contaminants. > > Doug Pauls > CSL > > ############################################################## > TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c > ############################################################## > To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: > To subscribe: SUBSCRIBE TECHNET <your full name> > To unsubscribe: SIGNOFF TECHNET > ############################################################## > Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information. > For the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311 > ############################################################## ############################################################## TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c ############################################################## To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TECHNET <your full name> To unsubscribe: SIGNOFF TECHNET ############################################################## Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information. For the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311 ##############################################################