The 34171B is a measurement system performance analyzer manufactured by Agilent Technologies. It is a compact, instrument-grade system performance analyzer designed to measure and analyze RF systems, signals and noise. It features three ports, allowing the simultaneous acquisition of three independent signals, enabling the simultaneous measurements of antennas, antennas and antennas, antennas and receivers, noise sources and more. The 34171B is ideal for basic measurements of system performance, including gain, noise figure, gain or loss over frequency, and variations in bandwidth performance. It can also be used to evaluate complex systems, such as cable TV transmission, radio broadcast and cellular networks, for RF gain and other system parameters.