As early as 1977, HP started production of the HP856x spectrum analyzers to complement its RF ability meters and sensors effective at measuring alerts in excessive of twenty GHz. HP also created configurable chassis centered sweep generators effective at building indicators to twenty GHz. Other T&M items of some time https://bookmarkinglife.com/story3127401/not-known-details-about-hp-%D8%AF%D8%B1-%D9%BE%D8%B2%D8%B4%DA%A9%DB%8C-%D9%85%D8%AE%D9%81%D9%81-%DA%86%DB%8C%D8%B3%D8%AA