(1) The standard current transformer should have an accuracy class that is two levels higher than the one being tested. This ensures that the reference device provides reliable and precise measurements, minimizing any potential impact on the test results.
(2) The error of the tested current transformer must conform to the acceptable limits specified by the relevant standards. This helps ensure that the device under test performs within its intended specifications and can be trusted for accurate measurements.
(3) The standard current transformer must maintain stable performance during the calibration period. Its error should not exceed the defined tolerance limits throughout the entire testing duration. This stability is crucial for ensuring consistent and repeatable measurement outcomes.
(4) The standard current transformer must be certified by an official metrology verification institution. This certification confirms that the device has been tested and meets all required accuracy and reliability standards, providing confidence in its use for calibration purposes.
In addition to these conditions, it's important to ensure that the standard current transformer is properly maintained and stored according to manufacturer guidelines. Regular checks and recalibrations are also recommended to maintain its performance over time. These practices help guarantee the integrity of the testing process and the reliability of the results obtained.
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