Transfer unit of test handler and method of operating the same

A transfer unit of a test handler, the transfer unit comprising:

• a base frame including inserted portions at opposite ends thereof, each inserted portion including a penetration hole;
• a floating assembly inserted in each penetration hole, the floating assembly configured to move sideways and up and down directions within the respective penetration hole;
• an arm part coupled to the coupling element of each floating assembly such that the arm part adjusts a height of each of four sides individually;
• location detection units disposed on the arm part, the location detection units configured to determine whether a test tray is adhered to the arm part each of the location detection units comprising the sensor dog contacting the test tray when the test tray is adhered to the arm part and a sensor disposed on the housing, the sensor detecting whether the sensor dog is in contact with the test tray;
• and
• a controller electrically connect to the sensor of the location detection units.

A transfer unit of a test handler, the transfer unit comprising:

• a base frame including an inserted portion, the inserted portion including a penetration hole;
• a floating assembly inserted in the penetration hole, the floating assembly configured to move in sideways and up and down directions within the penetration hole;
• an arm part coupled to the floating assembly, the arm part configured to move in sideways and up and down directions by the floating assembly;
• location detection units disposed in the arm part, the location detection units including a housing, a sensor dog movably installed in the housing, and a sensor detecting whether a test tray is in contact with the sensor dog;
• and
• a controller electrically connected to the sensor.