The present invention relates to resistive leakage current in a surge arrester that measures not voltage but leakage current alone in the surge arrester to obtain a resistive leakage current included in the leakage current so as to compensate for shortcomings in conventional metal-oxide surge arresters. The present invention performs a reference point detecting step (S20) to select a reference point by performing pattern analysis based on a characteristic pattern shown in a total leakage current (I.sub.T) when an applied voltage is 0V, a resistive leakage current calculating step (S30) to calculate a resistive leakage current by Fourier series-expanding the total leakage current (I.sub.T) starting at the reference point, and reference point verifying/correcting steps (S40 and S41) to correct the reference point until a characteristic pattern of the resistive leakage current (I.sub.R) according to non-linear resistance characteristics of the surge arrester (1) is shown so that the resistive leakage current (I.sub.R) is recalculated, and the present invention determines that the resistive leakage current (I.sub.R) calculated based on the completely corrected reference point is the resistive leakage current of the surge arrester (1).

Embodiments of the present application provide a method and an apparatus for battery SOC correction, and a battery management system, which relate to the technical field of batteries. The method includes: acquiring a voltage-SOC variation curve of a battery during a charging process; generating a voltage differential curve of the battery according to the voltage-SOC variation curve, the voltage differential curve being a variation curve of a differential value with SOC, the differential value being a ratio of a voltage variation to a SOC variation corresponding to the voltage variation during the charging process; determining a peak point on the voltage differential curve, the peak point being between any two adjacent plateaus on the voltage-SOC variation curve and not located on the any two adjacent plateaus; performing SOC correction on the basis of the peak point. This method is used to improve the SOC estimation accuracy.

Current sensing techniques. In an example, a current sensing method includes: generating a first magnetic field measurement; generating a second magnetic field measurement; generating a frequency estimate of a current; calculating a root-mean-square (RMS) value of an estimated amplitude of the current; and generating a temperature estimate of an integrated circuit (IC) configured to perform the method. The method also includes generating a first weighting factor and a second weighting factor based on the frequency estimate, the RMS value, and the temperature estimate, the first weighting factor to control amplification of the first magnetic field measurement and the second weighting factor to control amplification of the second magnetic field measurement.

A method for calibrating crosstalk errors in a system for measuring on-wafer S parameters and an electronic device are provided. The method includes two parts. The first part is the pre-calibration part, which obtain eight error terms of an on-wafer S parameter measurement system by using a thru calibration standard, two defined load calibration standards, two pairs of undefined reflect calibration standards, and the reciprocity properties of a passive reciprocal element. The first part performs pre-calibration on an uncalibrated system according to the eight error terms. The second part uses the pre-calibrated system to obtain the crosstalk errors of the measurement system, and performs a further calibration on the pre-calibrated system according to the crosstalk errors.

Testing apparatuses, and methods for using such apparatuses to calibrate and test an antenna, include a chamber that includes a lining, the lining being made from a material that is absorptive to radiation at a test wavelength. An adjustable platform is positioned at a first side of the chamber, the adjustable platform being rotatable to change an orientation of a device under test. A probe is positioned at a second side of the chamber, opposite to the first side of the chamber, that measures electromagnetic radiation from the device under test. A vector network analyzer communicates with the device under test and the probe to determine calibration information for the device under test.

The first battery module and the second battery module are connected by a bus-bar. A cell voltage sensing circuit shared by at least some battery cells of the first battery module and at least some battery cells of the second battery module measures a voltage of each battery cell.

An LCR meter to increase accuracy of balancing uses sub-balancing method, additional to analog balancing by trans-impedance amplifier (TIA). For this, the LCR meter, based on TIA, to correct analog auto-balancing, applies the inverted voltage equal to unbalanced voltage to noninverting input of the TIA. And only one measurement of voltages is needed for.

A method of sensing electrical power being provided to a structure using a sensing device, a calibration device, and one or more processing modules. The sensing device can include one or more magnetic field sensors. The sensing device can be attached to a panel of a circuit breaker box. The panel of the circuit breaker box can overlie at least a part of one or more main electrical power supply lines for an electrical power infrastructure of a structure. The calibration device can include a load unit. The calibration device can be electrically coupled to the electrical power infrastructure of the structure. The method can include automatically calibrating the sensing device by determining a first transfer function in a piecewise manner based on a plurality of ordinary power consumption changes in the structure. The method also can include determining a power consumption measurement using the one or more processing modules based on one or more output signals of the sensing device and the first transfer function. Other embodiments are provided.

The present application relates to a method for providing a corrected measuring signal indicating a high voltage on a high-voltage node (HV), including: injecting a periodic injection signal into a voltage divider coupled between the high-voltage node (HV) and a reference potential; obtaining a sensing signal at a sensing node (S) of the voltage divider, wherein the sensing signal depends on the periodic injection signal; from the sensing signal, separating a first sensing signal portion resulting from the high voltage and a second sensing signal portion resulting from the periodic injection signal; and depending on the second sensing signal portion, correcting the first sensing signal portion corresponding to the high-voltage signal in order to obtain the corrected measuring signal.

A device for measuring electric currents includes multiple current sensors of Rogowski type, each suitable for measuring an electric current flowing through an electrical conductor, these current sensors being in adjacent pairs and each including coils for measuring the current and a central aperture for receiving the corresponding electrical conductor. Each current sensor includes two of the coils, which coils are positioned in parallel and facing one another on opposite edges of the central aperture and two ferromagnetic bars extending between ends of the coils, perpendicularly to a longitudinal axis of the coils.