A method and apparatus for detection of load impedance modulation as a result of communication of data from the secondary to the primary side of a transformer are presented. The stress test apparatus includes a console, a rotary table, a lifting pole, a traversing arm, a securing fixture and torque sensor. The memory module records and stores data collected during the drilling process. The barrel holder has two positioning sockets corresponding to the two positioning through holes. A resource controller allocates resources of the millimeter wave frequency band to the at least one first communication device and the at least one second communication device based on the first control data and the second control data.