IPC TM-650 2.6.10A

Abstract

This non-destructive inspection method is needed to ascertain the following conditions: <br>a. Innerlayer shift is within acceptable tolerances. <br>b. One or more inner layers have not been reversed. <br>c. Drilled holes are aligned with pads to the extent that any break-out is within acceptable tolerances. <br>d. The minimum distance between a drilled hole and a ground plane clearance is within acceptable tolerances. <br>The test method will entail passing X-rays through the test specimen and converting the transmitted X-ray image into a visual image through the use of either X-ray film or a flouro- scopic (real time) device.<br><em>Cautionary notes:</em> <br>The construction of the multilayer with respect to; number of layers, thickness of copper and presence other metals such as heat sinks (e.g. Invar), will determine the power and sensitivity of the X-ray apparatus which can be used. All X-ray apparatus should be registered with the appropriate state or regional Radiation Control agency. <br>A radiation safety program should be implemented.