AUTOMATED TEST AND MEASUREMENT OF COMMON IMPEDANCE COUPLING IN AUDIO SYSTEM SHIELD TERMINATIONS

The ''pin 1 problem'' identified by Muncy has been with us since the s hift to the design of cost-effective audio processing equipment on pri nted-circuit boards. This design and manufacturing methodology and tec hnology, however, also is the root cause of more than one type of syst em interference problems, including common impedance coupling and susc eptibility to radio-frequency interference. Various test and measureme nt techniques are presented using the automated test features of the A udio Precision System One for both the engineering design and the veri fication of the manufacturing integrity. High-speed automated testing necessary to ensure a high level of product quality on the manufacturi ng floor is also described.