(1) The standard current transformer should have an accuracy class that is two levels higher than the one being tested. This ensures that the standard device provides a reliable reference, minimizing the impact of its own errors on the measurement results.
(2) The error value of the tested current transformer must conform to the acceptable standards specified for its accuracy class. This ensures that the device performs within the required tolerances under normal operating conditions.
(3) The variation or drift of the standard current transformer must comply with the regulations during the calibration period. It is essential that the error of the standard device does not exceed its defined limits throughout the entire testing duration, ensuring consistent and accurate measurements.
(4) The standard current transformer must be accompanied by a valid verification certificate issued by an authorized metrological institution. This certificate confirms that the device has been tested and meets the necessary accuracy and performance criteria.
In addition, it is important to ensure that the standard current transformer is properly maintained and stored according to manufacturer guidelines. Regular inspections and recalibrations are also recommended to maintain its reliability over time. These steps help ensure that all measurements remain accurate and traceable to national or international standards.
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