A probe for the measurement of electrical unbalance of networks and devices

A probe has been developed to measure residual electrical unbalance of nominally balanced networks and devices. In the form described, it makes convenient the use of single-ended 50 Ω instruments to measure electrical unbalance of wire pair networks and two-terminal devices. For electromagnetic compatibility (EMC) planning purposes, a knowledge of the electrical unbalance at signal interfaces in wire pair networks generally allows quantitative prediction of the conversion of wanted differential mode signals into unwanted radiated disturbances which can interfere with reception of radiocommunication services. The probe was first described to the CISPR in 1988. Since then, several other groups have also found it useful for measuring the electrical unbalance of telecommunication networks and devices. It has also been used to measure the differential mode signals and common mode disturbances at signal interfaces on balanced data signaling networks