By Les Hymes (auth.), Les Hymes P.E. (eds.)
The impetus to create this ebook originated from a number of issues. this sort of was once the perceived worth to the of a suite in a single quantity of quite a lot of details pertinent to the explanations and strategies for de fluxing revealed wiring assemblies (PWAs). This publication is anticipated to be of use not just to these engaged within the electronics packaging but additionally to these in similar fields looking info relating attainable tools of facing one of many en vironmental problems with our time: the destruction of the ozone layer surrounding and holding the planet with which we now have been entrusted. the quantity of knowledge relative to offering PW As freed from residues advert versely impacting operation, reliability, and lifetime of digital items is develop ing, and it'll proceed to extend at an speeded up fee as we search to compare our expertise wishes and wishes with our environmental tasks. on the time ofthis writing, which has spanned the latter part of 1989 and early 1990, the difficulty of selecting a brand new method of generating PW As freed from damaging residues whereas utilizing environmentally applicable production suggestions ap peared to be the main drawback of nearly all of these enthusiastic about the broadcast wiring meeting undefined. To many this intended using diversified fresh ing media and/or method or apparatus improvements; to others it intended the removal of the necessity to fresh via fabrics or approach changes.
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Extra info for Cleaning Printed Wiring Assemblies in Today’s Environment
Several papers ,-, 32 CLEANING PRINTED WIRING ASSEMBLIES ENVIRONMENTAL CHAMBER - --- , ~- I I • 3 I ---' MEGOHM METER + 45- "IVDC TEST + 100 VDC MEASUREMENT Fig. 4. Circuit diagrams for biasing and measuring SIR comb patterns. which have discussed theory and concepts behind the use of squares are recommended for further reading (Zado 1984; Gorondy 1984). More recently, a study has been documented showing that correlation is good within a range of squares of not more than one order of magnitude (Chan and Shankhoff 1989).
Musselman, R. P. "Shear Stress Cleaning of Printed Wiring Boards and Assemblies," Technical Program Proceedings, NEPCON East, Boston, MA, 1une 1985, p. 244. 4. Bonner, 1. K. "Effective Cleaning of Surface Mount Assemblies," Printed Circuit Assembly, August 1988, p. 8. 5. Willis, R. 9. 6. Wang, A. E, and K. C. Seghal, "Effects of Wetting and Capillary Action on the Cleaning of SMAs," Printed Circuit Assembly, August 1988, p. 16 7. Cabelka, T. , and W. Archer. "Critical Free Energy in Wetting: The Key to Maximum Effectiveness in SMA Cleanings," Surface Mount Assembly, December 1987, p.
Whether to use a bias voltage and whether this bias voltage should be the reverse polarity of the test voltage is an ongoing debate. Both the telecommunications and the IPC specifications require a 1()() VDC test voltage and a 45-50 VDC bias of reverse polarity. Although these electrical parameters may influence the SIR results, it is important to look at them in the context of the whole picture. That is, if one simply maintains particular settings for these parameters, then the changes in the SIR resulting from changes in the electrical parameters can be disregarded.
Cleaning Printed Wiring Assemblies in Today’s Environment by Les Hymes (auth.), Les Hymes P.E. (eds.)