What sort of flux are you using, organic acid no clean,
water cleanable, RMA?  Are you cleaning? How?

What sort of SIR equipment do you already have? 
Temperature humidity chamber? Measurement?
Do you need to use a standard SIR test, or is
an abbreviated test o.k. if it gives you useful
information?

I think a 24 hour test with 6 hr measurements if you 
have an SIR datalogger, like the ASR unit or the SIRometer,
would give you what you want. If you are doing manual
measurements, a single 24 hr measurement would do.  
35C/85% gives good discrimination
for no clean fluxes.  IPC-B-25 B (12.5 mil) combs should work.
Test at least 3 coupons, more would be better.

I also think that making ionic contamination measurements
and comparing the SIR data to the levels of contaminant would 
be very useful.

-- 
Karen Tellefsen
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