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From [log in to unmask] Fri Jun 14 17: |
53:42 1996 |
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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?
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