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
##############################################################