A Method to Evaluate Power Sensor Calibration Systems

This Power Sensor Calibration System used an indirect comparison method to calibrate a Device Under Test (DUT). A thermistor mount, calibrated by an external Calibration Laboratory, was the Standard Mount. The Effective Efficiencies and the associated accuracies of the Standard Mount were entered into a table the system computer. This system used a two step approach to perform the full measurement cycle. The first step was to measure the complex reflection coefficients of the DUT. The second step is shown in Figure 1. A power divider input was connected to a signal generator and amplifier. The Standard Mount was connected to one output of the divider. Another thermistor mount was connected to the other divider output.