A method of calibration is described that simplifies the measurement of battery impedance conducted in-situ while determining battery state-of-health. A single shunt measurement with a known Sum of Sines (SOS) current, at the desired frequency spread and known root mean squared (RMS) current is used to create a calibration archive. A calibration selected from this archive is used to calibrate an impedance measurement made on the battery.

A method of adjusting an electricity meter (1), the method comprising the steps of: measuring the frequency of the distribution grid (3); if the difference between the frequency of the distribution grid and a first frequency is less that a first predetermined threshold, adjusting the measurement module (10) by using first calibration parameters that were produced during a stage of calibrating the meter; if the difference between the frequency of the grid and the first frequency is greater than or equal to the first predetermined threshold, calculating second calibration parameters from the first calibration parameters and from adaptation parameters, and adjusting the measurement module (10) by using the second calibration parameters.

A calibration method is configured for calibrating an operation circuit which has a variant offset. The operation circuit includes at least one comparator circuit having a first variant offset. The calibration method provides an adjustable offset to calibrate the variant offset. The method includes: resetting an adjustment parameter to an initial value and configuring the operation circuit to a calibration mode; conducting an initial calibration procedure according to a comparison result of the comparator circuit, to decide an operation calibration code having plural bits; configuring the operation circuit to an operation mode; conducting a predetermined operation procedure according to the operation calibration code, wherein the operation calibration code corresponds to the adjustable offset; conducting a less bit number calibration procedure according to the adjustment parameter and a test calibration code to update the adjustment parameter or the operation calibration code; and repeating the above.

A system for the automated validation of a semi-anechoic chamber (SAC) is disclosed. The system includes a receive assembly and a transmit assembly, each configured to autonomously relocate within the SAC. The system also includes a local client communicatively coupled to the transmit assembly. The local client is configured to send a validation arrangement to the transmit assembly describing a validation location and a distance. The transmit assembly is configured to receive the validation arrangement, move the transmit assembly to the validation location and send an instruction to the receive assembly, the instruction describing the distance. The receive assembly is communicatively coupled to the transmit assembly and configured to receive the instruction and move the receive assembly such that a separation between the transmit and receive assemblies is restored to the distance. Each validation arrangement corresponds to a validation point. A plurality of validation points defines a test volume.

In a method for calibrating at least one sensor, wherein the sensor includes at least one piezoelectric element with at least one electrode, and wherein at least one electrode is embodied as a measurement electrode, it is provided as essential to the invention that an electrical excitation voltage is applied to at least one further electrode of the piezoelectric element, embodied as a calibration electrode, to create a mechanical deformation of the piezoelectric element, that the voltage induced by the deformation of the piezoelectric element is captured with at least one measurement electrode, and that the applied excitation voltage and captured voltage are compared.

A current transformer (CT) for the purpose of, for example, current measurement, that uses a power line as a first coil and a second coil for measurement purposes, is further equipped with a third coil. Circuitry connected to the third coil is adapted to measure a signal therefrom. The measured signal from the third coil is compared to a signal measured from the second coil and based on the results, internal CT parameters are determined allowing calibration of actual results to expected results thereby providing an improved accuracy. This is especially desirable when using the CT for measurement of the like of current or phase of the primary coil when measurements are adjusted using the newly determined calibration parameters.

A calibration system for magnetometers includes magnetometers configured to measure a magnetic field to be measured; a magnetometer holder fixedly mounted on the magnetometer holder; at least one magnetic field generating device having its position fixed relative to the magnetometers, and used to generate a calibration magnetic field distribution in a space to be measured; and a calculation device configured to calculate the magnitudes of magnetic field vectors at the positions of the magnetometers according to the calibration magnetic field distribution generated by the at least one magnetic field generating device in the space to be measured, receive measured magnitudes of the magnetic field vectors from the magnetometers, and calculate detection gain values of the magnetometers on the basis of the calculated magnitudes of the magnetic field vectors and the measured magnitudes of the magnetic field vector.

A system for measuring impedance which is tolerant of connection errors includes a measuring instrument and a relay plate. The relay plate includes a plurality of relay groups. A relay group comprises a first channel, a second channel, a third channel, and a fourth channel. The first to fourth channels are electrically connected to a conductive pin of the product. The relay board further comprises a first voltage interface, a second voltage interface, a first current interface, and a second current interface, the first voltage interface is electrically connected to the first channel, the first current interface is electrically connected to the second channel, the second voltage interface is electrically connected to the third channel, and the second current interface is electrically connected to the fourth channel, a control unit being able to switch between these when connected to obtain impedance measurements.

A current-measuring transducer device has a current transducer for measuring an electric current along a conduction path. The current transducer has a magnetic field-sensitive element for converting the magnetic field resulting from the current flow along the conduction path into at least one physical variable and a measuring device for measuring the physical variable. The current transducer device has a coil arrangement with at least one coil for simulating the magnetic field resulting from the current flow along the conduction path. There is also described a method for calibrating a corresponding current transducer and a computer program product for performing the calibration method.

A method for the onsite calibration of a Rogowski sensor to be calibrated, includes the steps of: cause the sensor to be calibrated to be positioned on a reference phase, or cause a reference sensor to be positioned on the phase to be calibrated; acquiring a calibration current measurement produced by the sensor to be calibrated, a reference current measurement produced by the reference sensor, and a reference voltage measurement on the phase on which are positioned the reference sensor to be calibrated following the positioning step; and using the calibration current measurement, the reference current measurement and the reference voltage measurement to produce calibration parameters of the sensor to be calibrated.