Founded in 1954, Advantest leads the world in test and measurement, their products support a wide range of related industries, from semiconductors to electronics and telecommunications. Advantest Semiconductor and Component Test Systems ensure reliability for high-speed communications and computing as a wide variety of semiconductor devices and electronic components are the heart of these networks. Wireless LAN networks, cellular telephones, contactless smart cards, terrestrial digital broadcasts - all of them have become a part of our daily lives, and all of them use high-frequency wireless technology. Demand from device manufacturers has driven a trend for measuring instruments to grow smaller and lighter, so that they may be transported outside the factory, to any location where maintenance and testing work needs to be done. The Advantest "U" series portable spectrum analyzers precisely meets these demands.