A novel method applies the down-conversion sampling technology to test a high-speed digital-to-analog conversion. The portable data storage device includes a first transceiver that communicates with a second transceiver associated with the digital broadcast signal receiver and further includes a memory for storing the received data. The method further comprises performing metrology upon at least one process run of the semiconductor device for acquiring metrology data and for performing a metrology data stackification process upon the metrology data using the manufacturing tag for organizing and stacking the metrology data. After demultiplexing, this information is utilized in conjunction with the sending timestamp of each RTP packet to create a sending time for each MPEG packet to aid in the reduction of jitter and clock drifting.