Application Notes
A calibration winding is a primary winding that can be useful for testing and calibration of a current transducer without applying nominal primary current.
The number of turns in the calibration winding is typically in the range of 100 to 3000.
The necessary calibration interval is determined by the user requirements. Considering the stability of the measurement instruments and the permissible measurement uncertainty a suited calibration interval can be chosen. This may vary between instruments.
When measuring currents at frequencies above 1MHz, the measurement setup becomes extra important for the precision of the measurement. It is important that the current fields are as symmetrical as possible seen from the current transducer’s perspective to obtain the highest precision of the measurement.