-
- News
- Books
Featured Books
- smt007 Magazine
Latest Issues
Current IssueBox Build
One trend is to add box build and final assembly to your product offering. In this issue, we explore the opportunities and risks of adding system assembly to your service portfolio.
IPC APEX EXPO 2024 Pre-show
This month’s issue devotes its pages to a comprehensive preview of the IPC APEX EXPO 2024 event. Whether your role is technical or business, if you're new-to-the-industry or seasoned veteran, you'll find value throughout this program.
Boost Your Sales
Every part of your business can be evaluated as a process, including your sales funnel. Optimizing your selling process requires a coordinated effort between marketing and sales. In this issue, industry experts in marketing and sales offer their best advice on how to boost your sales efforts.
- Articles
- Columns
Search Console
- Links
- Events
||| MENU - smt007 Magazine
Book Excerpt: 'The Printed Circuit Assembler’s Guide to...Process Control', Chapter 1
August 9, 2023 | I-Connect007Estimated reading time: 1 minute
Excerpt from: The Printed Circuit Assembler’s Guide to...Process Control
Chapter 1: How Did We Get Here?
Measuring SIR has been in use since at least the 1970s. We are aware that Siemens in Germany and GEC Marconi in the UK both developed SIR test systems that have remarkably similar measurement techniques. In 1987, research commenced to evaluate alternative chemistries to CFCs, such as Freon®, to be used in the cleaning of electronic assemblies. The pressure for this came from the Montreal Protocol, an international treaty designed to protect the ozone layer by phasing out the production of numerous substances responsible for ozone depletion. It was agreed on 16 September 1987 and entered into force on 1 January 1989.
This research was initially conducted by IVF (The Swedish Institute for Production Engineering based in Gothenburg) on behalf of business groups throughout the Baltic territories, and by NPL (The British National Physical Laboratory near London) on behalf of several major electronics businesses in the UK and Ireland. (GEN3 have a library of the majority of papers produced by both groups for anyone who is interested.)
The major obstacle encountered was: how do you assess how clean is clean—especially when the process control tool in use at that time was the ROSE test. The ROSE test, of course, needs to be considered as a cleaning process, so there is overlap and conflict with the cleaning technologies. This was especially problematic when “no-clean” fluxes were introduced, as cleaning was not intended; but, then, how do we measure? This is where SIR testing came into broader use. GEC were the only company who commercialised their equipment—the prototype AutoSIR we manufacture today.
It was in 1990 that the first known effort to implement objective evidence was done by GEC Meters in the UK, by the team under the leadership of B.J. Mason. The resulting paper, “No-clean Flux Appraisal—The Total Process Approach” was published by Circuit World Vol. 20, No. 2, 1994. The industry resolutely continued using the ROSE test for optimum convenience, so much so that it became regarded as the “Cleanliness Test” but…
Continue reading this book by visiting our library here.
Suggested Items
Manta Ray UUV Prototype Completes In-Water Testing
05/02/2024 | DARPAThe Manta Ray prototype uncrewed underwater vehicle (UUV) built by performer Northrop Grumman completed full-scale, in-water testing off the coast of Southern California in February and March 2024.
Real Time with… IPC APEX EXPO 2024: Exploring Electronic Card Testing and AI Integration with SPEA
05/02/2024 | Real Time with...IPC APEX EXPOLuca Fanelli, president of SPEA, and vice president Andrea Furnari discuss the company and its business units. The challenges in testing electronic cards and SPEA's solutions are discussed, and its focus on the US market is emphasized. The use of AI in testing, particularly in optical inspection and test program execution, is also examined.
Boeing T-7A Red Hawk Triples Progress
05/01/2024 | BoeingThe Boeing T-7A Red Hawk achieved three recent milestones, propelling the advanced pilot trainer for the U.S. Air Force forward.
Keysight Secures New Test Case Validations for Narrowband Non-Terrestrial Networks Standard
04/30/2024 | Keysight TechnologiesKeysight Technologies, Inc. has validated new conformance test cases for 3rd Generation Partnership Project (3GPP) Release 17 (Rel-17) standards for non-terrestrial networks (NTN) using narrowband internet of things (NB-IoT) technology.
Latest Test and Inspection Solutions from GOEPEL electronic at SMTconnect 2024
04/29/2024 | GOEPEL electronicGOEPEL electronic will be demonstrating automated test and inspection equipment at SMTconnect, taking place in Nuremberg from June 11 to 13, 2024.