Abstract
The first electromagnetic interferences in the frequency range of 2–150 kHz occurred more than a decade ago, but key standards of electromagnetic compatibility still do not cover the whole area of this frequency range. Several important questions arose due to the standardization process. One of them relates to the mechanism of disturbances spreading on the network. To investigate this in depth, we measured the surface impedance of stranded conductors, while we faced the problem that these measurements cannot be done without knowing the frequency dependent phase error of the current sensor used in the setup. This paper presents a method developed here to determine this phase angle error. The biggest advantage of the method is its simplicity and efficiency, because it requires equipment usually available in laboratories. Although the method was developed to aid our surface impedance measurements, it can also be used in other cases, when knowing the frequency dependent phase error of a current sensor is crucially important.
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