Simultaneous and Non-invasive Probe for Measuring Common-mode Voltage and Current

Kobayashi, Ryota; Nagao, Akihide; Ito, Hidenori; Hirasawa, Norihito

doi:10.23919/emctokyo.2019.8893871

Cited by 7 publications

(2 citation statements)

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“…The estimated ground-capacitances were approximately half of the capacitances measured and calculated in the previous sections IV-A and IV-B, respectively. We presume that this estimation error was mainly due to the simple capacitor model used in derivation of (2)- (6). Nonetheless, the result shown in Fig.…”

Section: Evaluation Results Of Ground-capacitance Estimating Devicementioning

confidence: 92%

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Unsymmetric Voltage of Conducted Noise Measurement System Without Grounding by Estimation of Ground Capacitance

Arai

Toriumi

Okamoto

et al. 2021

IEEE Trans. Instrum. Meas.

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Conducted noise originating from power supply equipment disrupts telecommunication networks, causing problems such as telecommunication interruptions and reduction in the speed of communication. Measurement of noise in data transmission lines at a repair site may require additional work to secure the electrical ground level for the measurement, because the data lines are differential pairs and the ground level is not always accessible. A method to estimate the capacitance between the measurement equipment and the ground was developed to allow measurement without access to the ground, i.e. in floating conditions. The method uses an oscillator and multiple electrodes to measure the capacitive coupling with the ground under the floor. A ground-capacitance estimating device was fabricated and tested. Its accuracy was further improved by incorporating a linear function to express the relationship between the output of the device and the known ground-capacitance in the calibration setting. This calibration procedure and the measurement procedure at the repair site are described. The noise voltage was calculated from the estimated ground-capacitance and the voltage reading of the floating measurement equipment. The estimated ground-capacitance was in the order of several tens of pF. The error of the corrected noise voltage was within 1.6 dB. Index Terms-Capacitance measurement, conducted noise, unsymmetric voltage, voltage measurement. I. INTRODUCTION ONDUCTED noise from several tens of kHz to several tens of MHz is generated at switching circuits in power supply equipment [1]-[3]. The consequent interference with communication devices disrupts telecommunication

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Section: Evaluation Results Of Ground-capacitance Estimating Devicementioning

confidence: 92%

“…Some studies have tried to improve the efficiency of these operations. For example, a probe that can measure the current and voltage of conducted noise simultaneously has been developed [6]. Measurement at a site becomes an onerous task when an electrical ground needs to be secured to measure the unsymmetric voltage of the conducted noise.…”

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confidence: 99%