I would suggest contacting Doug Pauls at Contamination Studies Labs ([log in to unmask]) for answers. As you can tell by his email name he has been knee deep in SIR testing for several years and is also heavily involved in the IPC committees concerning SIR. Dave Hillman Rockwell Collins [log in to unmask] ______________________________ Reply Separator _________________________________ Subject: SIR questions from Japanese colleague Author: [log in to unmask] at ccmgw1 Date: 6/12/96 8:17 PM These question were faxed to me by a Japanese colleague responsible for JIS SIR standards. I am sending him a copy of the IPC SIR handbook, and answers to some of the questions. If anyone has any answers or insight to add, I'll forward it to him. (I know, question 8 doesn't make sense, and some of the other questions are cryptic.) 11 Questions regarding SIR testing from A. Kiyosue Alpha Metals Japan Ltd. 5-50 Shinmachi Hiratsuka Kanagawa Japan 1/ Is there any acceleration coefficient between set temperature and humidity condition? further, what is the relationship of service environment conditions and life? Would you indicate the formula for life? 2/ What is the relationship between the temperature/humidity condition of the environment test, and the time before short circuit (migration) occurs? 3/ Would you indicate the admissible range of set temperatures and humidities. Also indicate how life is effected by this range? 4/ What is the basis for determining the value of bias voltage to be applied? 5/ To what extent the temperature by unsaturated PCT (Pressure Cooker Test) may be applied? 6/ What is the basis for the standard test conditions (85C 85%RH, 40C 90%RH, etc.)? 7/ It seems that the environment test conditions are similar to those of a single test; what do you think about the complex acceleration test? 8/ Has the environment test established by taking into consideration test? 9/ Has the environment test conditions such 40C/95%RH, 85C/85%RH,60C/90%RH? Is it possible to classify them based on test samples? 10/ What difference of the effects on life between the case that the bias voltage is applied at intervals and the case that voltage is applied continuously? 11/ What is the relationship between the bias voltage applied and the before short-circuit (migration) occurs?