A manipulator for positioning a test head is provided with a positioning means by which the test head is three-dimensionally positionable and with a cradle to which the test head is securable and which is connected to the positioning means. The manipulator includes a compensator which can be loaded by the mass of the test head. The positioning means includes a column and at least one lead screw extending in the vertical direction. The compensator is connected to the cradle and can be moved by the lead screw in the vertical direction. The compensator includes a driver cooperating with the lead screw and is guided in the vertical direction on the column. The compensator has a spring element which is biased and supported by the driver.