1. Introduction

In a very conventional approach, it can be stated that every microwave measurement consists of a transmitter, a receiver, and a device under test (DUT). The transmitter can be an economical signal generator or a stable and precise radio frequency (RF) source. Similarly, the receiver can be a spectrum analyzer, vector network analyzer (VNA), power meter with RF power sensor, or a receiver specific for particular measurement such as TEGAM VM-7 attenuation measurement system. The DUT, on the other hand, is the instrument or device whose electrical properties are intended to be measured. In a microwave metrology laboratory, a DUT can be a fixed attenuator, step attenuator, airline, waveguide, or any other component such as mixer, directional coupler, power divider or an amplifier such as mixer, directional coupler, power divider or an amplifier. For any microwave measurement process, these instruments can be configured for automatic operation using the various commercially available application development platforms such as MATLAB, Agilent VEE Pro, or National Instruments (NI) LabVIEW. The automated software solution for a measurement process may minimize the human involvement and thus reducing the errors and improving efficiency.