Patent ID: 7425839

Claim:
A system for testing a packaged microelectronic device including an array of external contacts, the system comprising: a test socket configured to receive the device for testing; a tester interface including a plurality of test contacts aligned with external contacts of the device when the device is received within the test socket; and a mask proximate to the test socket and the test contacts, the mask including a plurality of apertures arranged in a pattern corresponding to the plurality of test contacts and corresponding at least in part to the array of external contacts when the device is received within a nesting portion, the plurality of apertures including (a) first apertures having a first cross-sectional dimension to allow the corresponding test contacts to extend completely through the mask, and (b) one or more second apertures having a second cross-sectional dimension less than the first cross-sectional dimension to allow the corresponding test contacts to extend only partially through the mask.