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AV3985 Millimeter-wave Noise Figure Analyzer adopts several high and new technologies such as wideband track pre-selection, wideband low-noise millimeter-wave amplification, multi-functional integrated miniature design, high-speed sweep measurement, embedded PC hardware platform, Windows 2000 software platform, and Chinese interface, which is easy of realizing high-precision measurement of noise figure and gain in linear or quasi-linear network of microwave and millimeter-wave at 10 MHz ~ 40 GHz. It is widely used in the measurement of noise figure and gain of microwave and millimeter-wave amplifier, mixer, attenuator, etc. components and devices and front end linear circuit part of receiver. In comparison with the foreign testing program for noise figure at wave band of 8mm achieved through spread spectrum, AV 3985 has been improved substantially in respect of frequency precision, noise figure precision and gain testing range, etc., representing the highest level of technology for testing noise figure at wave band of 8mm both at home and abroad.