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88 PCB007 MAGAZINE I SEPTEMBER 2023 is is from a paper I gave at an IPC confer- ence in Denver in 1983. Obviously, computers have come a long way since 1983, so the mini- computer I discuss using here can easily be replaced by a simple desktop or notebook com- puter. e statistics are from Dr. W. Edwards Demings' first book and the soware used is from NIST'S Engineering Statistics Handbook. It's still very appropriate. Even though I speak in the present tense in the paper, I am talking about 1983; much of what is discussed here is related to the indus- try from the early 1970s through 1983. Introduction Over the past decade, Hewlett-Packard (HP) increased the performance, capability, sophistication of its products, and the PCB multilayers it contains in their complexity. One of the results of this trend has been the increasing use of high density multi- layer printed circuit boards, so the ability to find electrical opens and shorts through a visual inspection process has declined to the point that now it has become impossi- ble. Today, many PC manufacturers view bare board electrical test as unavoidable, Computer-aided Bare Board Testing, Revisited Happy's Tech Talk #22 by Happy Holden, I-CONNECT007 Released November, 1983, the HP-150 (aka HP Touchscreen or HP 45611A) was a compact, powerful and innovative computer made by Hewlett-Packard. (Source: Thomas Shanz, Wikimedia Commons)

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