ATE Test sockets for production use are expensive. If this fixture is used for testing over temperature range, the pcb usually falls apart(delamination) in six months from being cycled from 0 to 130 deg F once or twice a minute using liquid nitrogen. Sockets are also not supposed to be soldered to the test board. Having copper exposed in all areas where the socket touches the board probably minimizing warpage of the socket or the board. Sockets are expected to last longer than the board. Remove mask where the socket touches down. One more safety item that reminds me not to put passives where the socket body will interfere. which is good. Those fixtures are usually hand-assembled and expensive to spin because I screwed up.
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