Measurement of Disturbances at Telecommunication Ports by Using Both Voltage and Current Probes


IEICE TRANSACTIONS on Communications   Vol.E84-B   No.2   pp.147-154
Publication Date: 2001/02/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Communication Devices/Circuits
disturbance,  telecommunication ports,  ISN,  

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Method of measuring disturbances at telecommunication ports has been published by IEC/CISPR. A method using both disturbance voltage and current probes is useful because it does not require any impedance stabilization networks (ISNs). In this paper, the values measured using this method are theoretically and experimentally compared with those measured using ISNs. An experiment using a simple circuit model presents that the value obtained by using this method is lower than that by using ISNs in some cases. A theoretical analysis however derives that the estimated value by adding the margin to the measured value is always guaranteed to be large compared with the value measured by ISNs. The analysis also indicates that the margin is dependent on the deviation of phase angle of ISN and can be calculated by a simple equation. The experiment using actual equipment shows that the estimated results including the margin is always larger than those measured by ISNs. The results of the study show that the method using both disturbance voltage and current probes can be used for measuring the disturbances by taking the margin into account, and this margin can be reduced by improving the phase angle characteristics of the common mode impedance of ISNs.