Calibration system for voltage measurement devices

A calibration system operative to calibrate a voltage measurement device, the voltage measurement device comprising a plurality of voltage measurement device sensors and, in operation, the voltage measurement device generates at least one reference current signal and senses the at least one reference current signal in a conductor under test via the plurality of voltage measurement device sensors, the calibration system comprising:

• a controllable calibration voltage source operative to selectively output a voltage in a calibration conductor;
• and
• control circuitry communicatively coupleable to the calibration voltage source and the voltage measurement device, wherein the control circuitry, in operation:
• controls the calibration voltage source to output a calibration voltage in the calibration conductor;
• obtains a plurality of calibration points associated with the calibration voltage, each of the calibration points comprising:
• a plurality of reference current signal data points obtained from the voltage measurement device that are indicative of the reference current signals that are measured by the voltage measurement device via the plurality of voltage measurement device sensors when the calibration voltage source outputs the calibration voltage in the calibration conductor;
• and
• a calibration factor indicative of a ratio of the calibration voltage to a measured output voltage data point obtained from the voltage measurement device that is determined by the voltage measurement device based at least in part on the plurality of reference current signal data points;
• determines calibration data for the voltage measurement device based on the obtained plurality of calibration points, the calibration data dependent on the reference current signals measured by the voltage measurement device via the plurality of voltage measurement device sensors;
• and
• stores the calibration data on at least one nontransitory processor-readable storage medium associated with the voltage measurement device for use by the voltage measurement device during subsequent operation of the voltage measurement device.

A method of operating a calibration system to calibrate a voltage measurement device, wherein the voltage measurement device, in operation, generates a reference current signal and senses the reference current signal in a conductor under test via a voltage measurement device sensor, the method comprising:

• for each calibration voltage of a plurality of calibration voltages,
• controlling a calibration voltage source to output the calibration voltage in a calibration conductor;
• obtaining a plurality of calibration points associated with the calibration voltage, each of the calibration points comprising:
• a reference current signal data point obtained from the voltage measurement device that is indicative of the reference current signal that is measured by the voltage measurement device via the voltage measurement device sensor when the calibration voltage source outputs the calibration voltage in the calibration conductor;
• and
• a calibration factor indicative of a ratio of the calibration voltage to a measured output voltage data point obtained from the voltage measurement device that is determined by the voltage measurement device based at least in part on the reference current signal data point;
• determining calibration data for the voltage measurement device based on the obtained plurality of calibration points, the calibration data dependent on the reference current signal measured by the voltage measurement device and the plurality of calibration voltages;
• and
• storing the calibration data on at least one nontransitory processor-readable storage medium associated with the voltage measurement device for use by the voltage measurement device during subsequent operation of the voltage measurement device.