| Popis: |
Electromagnetic conducted noise that propagates through metallic cables often causes communication problems, such as interruptions in communication systems. When such a problem occurs, the frequency and strength of the conducted noise are investigated in order to determine the source of the conducted noise. We herein propose a method by which to measure the voltage to the ground of electromagnetic noise on metallic cables using shoe-shaped wearable devices to make the investigation easier. In the proposed method, maintenance personnel will stand on the devices and hold the signal cable to be investigated. The capacitive coupling between the feet and the floor is measured by the device, and the voltage reading of the measurement apparatus is adjusted using the capacitance in the measurement loop. The measurement accuracy and influence of the posture of the maintenance person are evaluated in a typical office with a raised floor with metal panels that form the return path of the conducted noise. In the present study, the measurement error was generally less than 3.85 dB, which is the expanded uncertainty allowed for measurement using a capacitive voltage probe, and the variation caused by the posture of the maintenance person was less than 2.6 dB. |
