Patent ID: 7737710

Claim:
An apparatus for testing electric characteristics of a test object including first connection terminals on a bottom surface and second connection terminals on a top surface, the apparatus comprising: a test board comprising first pads on a predetermined surface; a socket configured to electrically connect the test object to the test board; and a handler configured to transport the test object to the socket, wherein the socket comprises: a first connection unit configured to electrically connect to the first connection terminals of the test object; and a second connection unit configured to electrically connect to the second connection terminals of the test object; wherein the first connection unit comprises first pins configured to electrically connect directly the first pads of the test board to the first connection terminals of the test object, and the second connection unit comprises: a socket substrate comprising first pads and second pads electrically connected together; second pins configured to electrically connect directly the first pads of the socket substrate to the second connection terminals of the test object; and a reference electronic device configured to electrically connect to the second pads of the socket substrate and to exchange electric signals with the test object, wherein the reference electronic device is in a different location of the apparatus than the test object.