Measurement board for electronic device test apparatus

A measurement board for electrically connecting an electronic device under test and a test apparatus, comprising:

• a base board having a contactor to which said electronic device under test is to be electrically connected mounted on its front surface and having a signal conductor interconnect electrically connected to said contactor formed on its front surface,
• a coaxial connector to which a coaxial cable electrically connecting said measurement board and said test apparatus is connected, passing through said base board from its back surface toward its front surface, and having a front exposed part of a center contact bent and electrically connected to said signal conductor interconnect, and
• a cover member covering and contacting at least part of said front exposed part of said center contact and correcting an impedance of said front exposed part of said center contact, wherein said cover member comprises:
• a first dielectric arranged around said front exposed part of said center contact;
• a first conductor interconnect arranged to face said front exposed part of said center contact across said first dielectric;
• a plurality of second dielectrics arranged facing said front exposed part of said center contact across said first conductor interconnect;
• and
• a plurality of second conductor interconnects stacked between said plurality of second dielectrics and on a topmost second dielectric, and
• said first conductor interconnect and the plurality of said second conductor interconnects are electrically connected through via holes.