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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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