Test Unit and Test System

A test unit to be used with a tester that tests an electrical characteristic of an electronic circuit formed in a wafer, the test unit comprising:

• a tester board that is accommodated in a system box and electrically connected to the tester;
• a first wireless port that is mounted on a lower surface of the tester board and electrically connected to the tester;
• a probe board that includes a probe to be in contact with an electrode pad of the electronic circuit, and is configured so that the probe board may be transferred along with the wafer into the system box while the probe and the electrode pad are in contact with each other;
• a second wireless port that is mounted on an upper surface of the probe board electrically connected to the probe, and carries out contactless transmission/reception with the first wireless port:
• a chuck plate that is accommodated in the system box in order to be away from the tester board, and holds the probe board and the wafer transferred into the system box;
• and
• an expandable chamber having flexibility that allows the expandable chamber to be inflated by introducing gas thereinto, thereby applying pressure onto the probe board and wafer held by the chuck plate,
• wherein the first wireless port is arranged in order to face the second wireless port via the expandable chamber, and test signals are contactlessly transmitted/received through the expandable chamber by the first and the second wireless ports.