IEC 62053-23:2020 pdf download-Electricity metering equipment – Particular requiremen.
5 Construction requirements
The requirements of IEC 62052-1 1 :2020 apply.
6 Meter marking and documentation
The requirements of IEC 62052-1 1 :2020 apply.
7 Accuracy requirements
7.1 General test conditions
Tests and test conditions given in IEC 62052-1 1 :2020 apply.
7.2 Methods of accuracy verification
Tests and test conditions given in IEC 62052-1 1 :2020 apply.
7.3 Measurement uncertainty
The measurement uncertainty estimation methods given in IEC 62052-1 1 :2020 apply.
7.4 Meter constant
The requirements of IEC 62052-1 1 :2020 apply.
7.5 Initial start-up of the meter
The requirements of IEC 62052-1 1 :2020 apply.
7.6 Test of no-load condition
Tests and test conditions given in IEC 62052-1 1 :2020 apply.
7.7 Starting current test
Tests and test conditions given in IEC 62052-1 1 :2020 apply.
7.8 Repeatability test
Tests and test conditions given in IEC 62052-1 1 :2020 apply.
7.9 Limits of error due to variation of the current When the meter is operated under the reference conditions given in IEC 62052-1 1 :2020, 7.1 , the percentage errors shall not exceed the limits for the relevant accuracy class given in Table 3. If the meter is designed for the measurement of energy in both directions, the values in Table 3 shall apply for each direction. If the meter is rated for multiple connection modes, the accuracy testing results are valid only for the connection modes tested and cannot be used to claim accuracy for other, untested connection modes.
7.1 0 Limits of error due to influence quantities Tests and test conditions given in IEC 62052-1 1 :2020, 7.1 apply. If the meter is rated for multiple connection modes, the accuracy requirements apply for each of the connection modes. All tests of effects of influence quantities shall be performed in one connection mode selected to exercise the complete metrological capability of the meter. When the current and the phase displacement (sin φ) are held constant as specified in Table 4, and any single influence quantity is applied one at a time, with the meter otherwise operated at reference conditions as specified in IEC 62052-1 1 :2020, 7.1 , the variation in percentage error relative to the intrinsic error shall not exceed the limits specified for the relevant class indexes given in Table 4. The variation in percentage error induced by the influence quantities may vary depending on the value of the test current. The variation in percentage error in Table 4 is given for the specified values or ranges of the test current but the testing should be performed at the recommended values of test current given in Table 4.