Testing device and method for determining a common mode signal of an electrical telecommunication

摘要

Testing device comprising: a first terminal configured to be connected to an equipment under test; a common-mode detector configured to detect a common-mode part of a signal emitted from said equipment under test; and a first impedance unit connected in series between said first terminal and said common-mode detector; wherein said first impedance unit is configured to adjust a longitudinal conversion loss of said testing device to a predetermined value. A corresponding method for determining a common mode signal of an electrical telecommunication is provided as well.