JP2854901B

PURPOSE:To eliminate the need to readjust the height position of a downward moving mechanism by determining a pressing force to the measurement contact pin of an electric connection part according to the size and shape of a pressure member and absorbing the overstroke of the downward moving mechanism by a spring. CONSTITUTION:The electric connection part of a flat IC package 14 mounted on a socket 2 is pressed against the contact pin 3 for measurement by the downward movement of the pressure member 31 by the pressure member downward moving mechanism 12 to test characteristics. At this time, the pressure part 31 has a stopper part 31c which abuts on the top surface of the socket 2 and while this abuts on the top surface of the socket 2, the pin 3 is pressed by a specific quantity. At the same time, a compression coil spring 35 is provided between a rod 32 which transmits the operation of the mechanism 12 to the pressure part 31 and the pressure part 31 to absorb the overstroke of the mechanism 12. Thus, the mechanism 12 is put in operation to move down the pressure part 31, has the lowest movement position where the stopper part 31c abuts on the top surface of the socket 2, so that its operation exceed ing the position is absorbed by the spring 35.