Functional Test on RF And High-Speed Connectors on PCBA's And Cable Harness Assemblies for Automotive Applications
This paper presents test methods to effectively perform conducted testing on RF and high-speed data connectors for automotive applications. In almost any modern vehicle there are numerous high frequency and high-speed connectors which are used for applications such as cameras, internet connectivity thru cellular data, safety tasks, car entertainment, etc. These connectors are not easy to test. For example, a cable harness connector may have a hermetical seal which makes it hard to contact with a test probe. Connectors on printed circuit board assemblies and modules may be very small and densely spaced, which leads to additional testing challenges. This paper presents how typical RF and high-speed connectors from the automotive industry look like, describe the difference between single-ended and multi-signal / high speed connectors and show spring-loaded test pins that are used to establish temporary electrical contact for the purpose of electrical test. Electrical tests include tests that are done "at speed" as well as simpler applications such as continuity checks. Hi pot testing on such connectors and what that means for the test probe are also addressed. Furthermore, there is a deep dive into test fixture topics and a demonstration of why flexible cabling is a must and how to route wiring for such tasks inside a shielded or unshielded test apparatus. Such fixtures typically are also densely packed - there's not a lot of room for cabling - yet at the same time a simple mistake can cause test probes to be misaligned or worse to get damaged beyond the possibility of repair and there is a demonstration on how to prevent that. After this talk, engineers will have what it takes to successfully plan a test strategy to do functional testing for such applications.