Greg,
Agree with you on take a reading when the slope stablized. However, if
the PWB solder mask is poorly cured (like some of the UV curable
system), you may see the extraction of other elements than the flux
residue.
jk
>-----Original Message-----
>From: TechNet [mailto:[log in to unmask]] On Behalf Of Miller,
>Greg @ DISPLAYS
>Sent: Monday, May 05, 2003 2:00 PM
>To: [log in to unmask]
>Subject: Re: [TN] Ionograph
>
>
>The Ionograph works by first dissolving the flux material,
>then measuring those species that ionize. Small amounts of
>rosin will be tested with good accuracy. However, if your
>parts have visible spots of rosin before (and
>after) testing, then the test results will be both inaccurate
>and variable. Unlike water soluble flux residues (which are
>very accurately tested in the Ionograph), rosin does not
>dissolve well in IPA/water.
>
>I would suggest letting the IPA/water warm as much as possible
>prior to running a test, and run the first few tests on
>representative pieces for at least 40 - 45 minutes to see if a
>plot of contamination vs time begins to "flatten out". With
>the knowledge of how much contamination to expect, you can
>then look to lower your test times to something more
>reasonable. Apply your efforts here not to comply to
>traditional Mil Specs, but rather to process control (hence
>alerting that a change has been introduced).
>
>Greg Miller
>L-3 Communications
>Display Products
>Alpharetta, GA 30004
>770-346-8154
>
>-----Original Message-----
>From: Stolar, Paul W [mailto:[log in to unmask]]
>Sent: Friday, May 02, 2003 2:50 PM
>To: [log in to unmask]
>Subject: [TN] Ionograph
>
>
>Paul Stolar
>Materials Engineer
>Houston Technology Center
>Baker Atlas
>713-625-5376
>713-625-4949 (fax)
>
>It has been a while since I worked with rosin fluxes. How well
>does the ionograph with IPA/H20 work?
>
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