the rear the test head can still be moved with relatively little applied force thereby satisfying the requirements for compliant docking application_number US 18448802 A description fig3 a 3c show different views of a manipulator 310 for positioning a test head 312 according to a first embodiment of the invention a device interface board dib 316 is attached to the test head 312 for interfacing the test head with a peripheral not shown such as a prober or a handler the manipulator 310 includes a body 310 a mounted to a base 310 c an arm 310 b extends from the body 310 for supporting the test head 312 the manipulator 310 can move the arm 310 b up and down in a z direction for positioning the test head vertically in space an interface assembly 314 connects the test head 312 to the manipulator 310 the interface assembly includes a first portion attached to the body 310 a of the manipulator via the arm 310 b and a second portion attached to the test head 312 the first and second portions are coupled together in a manner that supports the weight of the test head yet allows the test head to be rotated about any of the conventional rotational components theta tumble and twist fig3 a shows the test head 312 rotated to.