Disclosed is a test fixture which electrically tests units which have on-grid and off-grid test sites defined by holes. The central feature of this test fixture is the use of an array of flexible test probes which are arranged in an on-grid configuration. Each probe has a conical tip which is inserted...http://www.google.co.uk/patents/US4866375?utm_source=gb-gplus-sharePatent US4866375 - Universal test fixture
