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100 PCB007 MAGAZINE I SEPTEMBER 2023 • Phase 3 was to define and generate an IMAGE-1000 database for the electrical test, troubleshooting, and repair areas. is phase included the control programs to supervise set up, download, and save of connection files, test, and test suspension, as well as routine QA, production reports and graphs. • Phase 4 was to incorporate advanced statistical analysis (T-tests and F-tests) learned from the NIST Engineering Statistics Handbook and the free Dataplot soware supplied by NIST 1 . Computer-aided Manufacturing 2–4 e electrical test/quality analysis system is one of five automation centers at SPCF. e other four centers control: 1. Chemical processes 2. N.C. fabrication 3. Manufacturing engineering 4. Manufacturing planning and control (as diagrammed in Figure 8) is is a computer-aided manufacturing (CAM) strategy that has been implemented in most of Hewlett Packard's 44 manufacturing divisions throughout the world. e strategy follows a hierarchy of computer systems, each focused on specific requirements and func- tions. is hierarchy is summarized in Figure 9. Other papers on automation at HP's PCB facil- ities are available in Automation and Advanced Procedures for PCB Fabrication 5 . PCB007 References 1. Handbook of Statistical Methods, and software, NIST/SEMATECH. 2. "A Distributed Approach to Computer-Aided Manufacturing," by Happy Holden, Electronics Man- ufacturing Technologies and Systems Conference, February 1983. Figure 8: CAM, system hierarchy of an HP Printed Circuit Facility. 5