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目前,国外有线电测量仪器产品较多的厂家有西德西门子公司(SIE-MENS),万德尔和戈尔德曼电子精密测量仪器公司(W&G),日本安立公司,安膝公司以及美国赛拉(SLE-RRA)公司等。生产的产品品种已布满DC-500MHz频带,能测试10800路载波通信设备的全部项目。这些厂家除保留传统产品外,都先后研制出数字化,程序控制化的自动测试仪器。这些厂家生产仪器归纳有如下特点:
At present, there are many foreign manufacturers of wireline measuring instruments such as SIE-MENS, Wandell and Goldman Electronic Precision Measuring Instruments (W & G), Anritsu Japan, Ankai and American Cela (SLE-RRA) companies. Production of product variety has been covered DC-500MHz band, can test 10800 all the carrier communications equipment projects. In addition to these manufacturers to retain the traditional products, have developed a digital, program-controlled automatic test equipment. These manufacturers have summarized the following characteristics of the production equipment: