As early as 1977, HP commenced creation of the HP856x spectrum analyzers to enrich its RF electricity meters and sensors able to measuring indicators in extra of twenty GHz. HP also produced configurable chassis dependent sweep generators able to making indicators to 20 GHz. Other T&M goods of enough time https://borna.news/fa/news/2055964/%D8%B3%D8%B1%D9%88%D8%B1-hp-%DA%86%DB%8C%D8%B3%D8%AA-%D9%88-%DA%A9%D8%A7%D8%B1%D8%A8%D8%B1%D8%AF-%D9%87%D8%A7%DB%8C-%D8%A7%D9%86-%D8%AF%D8%B1-%D9%BE%D8%B2%D8%B4%DA%A9%DB%8C