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PCBD-Oct2015

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October 2015 • The PCB Design Magazine 69 5 Material Witness: using Scaled Flow Data The iPC TM-650 Scaled Flow Test (2.4.38) uses three values to determine pressed thickness and flow of a given resin system: ho (the theoretical value of a pressed sample assuming no air entrain- ment and no flow calculated from the weight of the test stackup), hf (the actual final thickness per ply measured by micrometer after the flow test) and Δh (the difference between ho and hf expressed in mils of thickness change). 6 Automotive Systems Design: a Support Engineer's Perspective Assume you need to design a multipart complex product requiring several PCBs to be fitted into a tight housing. Assume also that you have to bring product iterations to market as fast as possible, be it at regular intervals or on demand. Finally, assume that you will have to do this not only faster, but also at an increasingly lower cost. This is a trend that becomes the norm for products in many in- dustries, not least in automotive electronics. 7 EDA Industry Revenue up 8.5% in q2, But PCB Drops The eDA Consortium (eDAC) Market Statistics Ser- vice (MSS) has announced that the eDA industry revenue increased 8.5 percent for Q2 2015 to $1.9 billion, compared to $1.75 billion in Q2 2014. But PCB and MCM revenue dropped 13 percent compared to Q2 2014. The four-quarters moving average, which compares the most recent four quarters to the prior four quarters, also increased by 8.5 percent. 8 Herbstman, Holden and Kowalewski to Lead Denmark HDI Workshop This workshop is for all PCB layout designers who see the need to achieve 2X to 4X higher board density, better electrical performance, or even those who just need to reduce the size or thickness of a finished board. This class is essential for those who use hDi, but it is not limited to hDi designers. So, if you want to learn how to use hDi or just be better at it, come learn from the best. 9 Kelly Dack and Mark Thompson unite in War on Failure There's been a lot of talk about fighting the war on failure in the PCB industry. But what strate- gies should our generals follow to prosecute this war? What exactly constitutes a failure in the first place? is this war even winnable? i recently spoke with longtime designer kelly Dack and CAM sup- port veteran Mark Thompson of Prototron Circuits about the best battle plans for beating failure. J The Gerber Guide, Chapter 22 never mirror or flip layers! All layers must be viewed from the top of the PCB, which means that the text must be readable on the top layer and mirrored on the bottom layer. Alas, sometimes, in a mistaken attempt to be helpful, designers flip layers because they must anyway be mirrored on the photoplotter. This could be helpful in a world where the designer's files are used directly in fabri- cation, but these data layers are actually input for the CAM system. PCBDesign007.com for the latest circuit design news and information — anywhere, anytime. October 2015 • The PCB Design Magazine 69

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