A probe card is provided for probing a semiconductor wafer with raised contact
elements. In particular, the present invention is useful with resilient contact
elements, such as springs. A probe card is designed to have terminals to mate with
the contact elements on the wafer. In a preferred embodiment, the terminals are
posts. In a preferred embodiment the terminals include a contact material suitable
for repeated contacts. In one particularly preferred embodiment, a space transformer
is prepared with contact posts on one side and terminals on the opposing side.
An interposer with spring contacts connects a contact on the opposing side of the
space transformer to a corresponding terminal on a probe card, which terminal is
in turn connected to a terminal which is connectable to a test device such as a
conventional tester.