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January 2007

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Subject:
From:
Drew meyer <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Drew meyer <[log in to unmask]>
Date:
Tue, 16 Jan 2007 10:05:02 -0600
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Werner,

I think that ROSE test (see below) is bulk contamination testing as it used to 
be known.  We had a couple of WESTEK units that tested this way.  I expect 
that the sensitivity has improved a great deal.

Drew

ROSE testing uses a calibrated mixture of isopropanol (IPA) and deionized (DI) 
water to remove soluble contaminants from a sample printed circuit assembly. 
The change in the resistivity of the test solution used to wash the assembly 
provides a measure of the average ionic contamination present on the board. 
ROSE determines the total volume of contamination on an assembly, but does 
not show the distribution of contamination. The advantage of a ROSE tester is 
its ability to quantify the total volume of ionic contamination present on an 
assembly quickly and accurately. 

Many automatic ROSE testers perform basic calculations that factor the 
assembly’s surface area and express cleanliness results based on the 
assembly’s size (i.e. X micrograms NaCl/in2). The determination of an 
assembly’s surface area provides a perspective in determining specific pass/fail 
results. 

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