A method and a measurement system for determining the noise power of a device under test especially the exact noise power is provided. The measurement method comprises determining a sideband gain of a measurement system using a calibration unit, connecting a device under test to the measurement system, measuring a noise power of the device under test with a receiver and correcting the measured noise power with the determined system gain including a sideband gain.

A measurement method includes: measuring a reception intensity of radio waves transmitted from a radio wave transmitting apparatus at an installable position of a radio wave receiving apparatus operated by power of radio waves transmitted from the radio wave transmitting apparatus; and determining, on the basis of the reception intensity of radio waves, if the radio wave receiving apparatus can operate when installed at the installable position.

A method of characterizing frequency fluctuations of a resonator comprising the steps of: a) driving the resonator, in a linear regime, by simultaneously applying two periodical driving signals having respective frequencies, the frequencies being different from each other and from a resonant frequency of the resonator, but contained within a resonance linewidth thereof; b) performing simultaneous measurements of response signal of the resonator at the frequencies of the periodical driving signal; and c) computing a value representative of a correlation between the measurements, the value being indicative of frequency fluctuations of the resonator. An apparatus for implementing such a method is provided.

A method of characterizing frequency fluctuations of a resonator comprising the steps of: a) driving the resonator, in a linear regime, by simultaneously applying two periodical driving signals having respective frequencies, the frequencies being different from each other and from a resonant frequency of the resonator, but contained within a resonance linewidth thereof; b) performing simultaneous measurements of response signal of the resonator at the frequencies of the periodical driving signal; and c) computing a value representative of a correlation between the measurements, the value being indicative of frequency fluctuations of the resonator. An apparatus for implementing such a method is provided.

Systems and methods relate to electric propulsor fault detection. An exemplary system includes at least a first inverter configured to accept a direct current and produce an alternating current, a first propulsor, a first motor operatively connected with the first propulsor and powered by the alternating current, and at least a noise monitoring circuit electrically connected with the direct current and configured to detect electromagnetic noise and disengage the at least an inverter as a function of the electromagnetic noise.

A method for analyzing noise spectrum of an electronic device includes storing a waveform data including a plurality of data points, the waveform data is obtained by measuring a target signal from the electronic device, removing data points corresponding to a background noise fluctuation based on a smooth curve of the waveform data, data points considered candidates for peaks are extracted from the waveform data, classifying the extracted data points based on a distance between adjacent data points in order to discriminate a cluster of distant data points from data points closely positioned to dominant peaks, determining the dominant peaks based on the cluster of distant data points such that the data points closely positioned to the dominant peaks are ignored, each dominant peak corresponds to the characteristic of the electronic device, and outputting the dominant peaks as an analysis result for the electronic device.

A connector includes a first layer having first and second communication channels, and a ground channel. The first and second communication channels form a first differential pair and transmit a differential signal. The ground channel separates the first differential pair from a next differential pair within the first layer. A surface of the ground channel nearest the first and second communication channels is selectively roughened to a particular roughness level to dampen crosstalk between the first differential pair and the next differential pair to a particular crosstalk level.

A connector includes a first layer having first and second communication channels, and a ground channel. The first and second communication channels form a first differential pair and transmit a differential signal. The ground channel separates the first differential pair from a next differential pair within the first layer. A surface of the ground channel nearest the first and second communication channels is selectively roughened to a particular roughness level to dampen crosstalk between the first differential pair and the next differential pair to a particular crosstalk level.

An electric power equipment comprises: a display module; a sensor module for outputting measurement data including a first noise signal measured from inside of the electric power equipment, a second noise signal measured from outside of the electric power equipment, a temperature signal of the electric power equipment, and a humidity signal of the electric power equipment; and a control module for diagnosing whether a partial discharge has occurred based on the measurement data, wherein the control module includes: a determination unit for determining whether a signal magnitude of the first noise signal is within a preset first reference range; an analysis unit for diagnosing an occurrence of the partial discharge, and for analyzing the signals according to the analysis algorithm; and a control unit for controlling a result information of the analyzing, and a maintenance and repair information, to be displayed.

An electric power equipment comprises: a display module; a sensor module for outputting measurement data including a first noise signal measured from inside of the electric power equipment, a second noise signal measured from outside of the electric power equipment, a temperature signal of the electric power equipment, and a humidity signal of the electric power equipment; and a control module for diagnosing whether a partial discharge has occurred based on the measurement data, wherein the control module includes: a determination unit for determining whether a signal magnitude of the first noise signal is within a preset first reference range; an analysis unit for diagnosing an occurrence of the partial discharge, and for analyzing the signals according to the analysis algorithm; and a control unit for controlling a result information of the analyzing, and a maintenance and repair information, to be displayed.