As early as 1977, HP started production of the HP856x spectrum analyzers to complement its RF electricity meters and sensors able to measuring signals in excessive of 20 GHz. HP also manufactured configurable chassis centered sweep turbines able to generating alerts to 20 GHz. Other T&M goods of the time https://dailybookmarkhit.com/story17764234/%D8%B3%D8%B1%D9%88%D8%B1%D9%87%D8%A7%DB%8C-hp-fundamentals-explained