1116pa humstopper 75:75ohm, 20hz-25mhz for ground isolation in video and data tramission systems. input and output connecto are iulated from ground and from each other. isolation traforme are usually unbalanced to unbalanced with equal input and output impedances, i.e. one to one tur ratios. their purpose is to discriminate agait spurious voltages resulting from the flow of undesired currents between the lo sides of the source and a remote load. if your video, data or rf tramission is plagued by hum ba or other interference problems, do what other broadcast, telecommunicatio and cctv enginee have been doing successfully for over forty yea. itall north hills&quo; isolation traforme! north hills&quo; /humstoppe/ provide quick, cost-effective solutio to interference due to differences in ground potential or induced common-mode 本产品的品牌是northhills，型号是1116pa，测量范围是20hz-25mhz（hz），准确度是99，输入信号幅度是220（v），适用范围是75:75ohm