SLVUDF6 September 2025
After performing gain calibration, if the accuracy at low currents is not acceptable, offset calibration can be done. Offset calibration removes any crosstalk, such as the crosstalk to the current channels of a phase from the line voltages.
To perform active power offset calibration for a phase, add the offset to be subtracted from the active power reading (in units of mW) to the current value of the active power offset (labeled Active power offset (mW) in the meter calibration factors window) and then enter this new value in the Active power offset (mW) field in the Manual Calibration window. As an example, if the Active power offset (mW) has a value of 200 (0.2W) in the meter calibration window, and subtracting an additional 0.300mW is desired, then enter a value of 500 in the Active power offset (mW) field in the Manual Calibration window. After entering the value in the Active power offset (mW) field in the Manual Calibration window, press the Update meter button.
To perform reactive power offset calibration for a phase, a similar process is followed as the process used to perform active power offset calibration.