IEC 62053-41-2021 Electricity metering equipment – Particular requirements – Part 41: Static meters for DC energy (classes 0,5 and 1)

IEC 62053-41-2021 Electricity metering equipment – Particular requirements – Part 41: Static meters for DC energy (classes 0,5 and 1).
5 Construction requirements
The requirements, test conditions and procedures, and acceptance criteria of IEC 62052-1 1 :2020 apply.
6 Meter marking and documentation
The requirements of IEC 62052-1 1 :2020 apply, except AC meter specific items, e.g. frequency.
7 Accuracy requirements
7.1 General test conditions
The requirements, test conditions and procedures, and acceptance criteria of IEC 62052-1 1 :2020 apply, except that the requirements for phase sequence, voltage unbalance and waveform of Table 1 0 of IEC 62052-1 1 :2020 do not apply.
7.2 Methods of accuracy verification
The requirements, test conditions and procedures, and acceptance criteria of IEC 62052-1 1 :2020 apply.
7.3 Measurement uncertainty
The requirements, test conditions and procedures, and acceptance criteria of IEC 62052-1 1 :2020 apply.
7.4 Meter constant
The requirements, test conditions and procedures, and acceptance criteria of IEC 62052-1 1 :2020 apply.
7.5 Initial start-up of the meter
The requirements, test conditions and procedures, and acceptance criteria of IEC 62052-1 1 :2020 apply.
7.6 Test of no-load condition
The requirements, test conditions and procedures, and acceptance criteria of  IEC 62052-1 1 :2020 apply.
7.7 Starting current test
The requirements, test conditions and procedures, and acceptance criteria of IEC 62052-1 1 :2020 apply.
7.8 Repeatability test
The requirements, test conditions and procedures, and acceptance criteria of 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 4.
If the meter is designed for the measurement of energy in both directions, the values in Table 4 shall apply for each direction.
7.1 0 Limits of error due to influence quantities
Tests and test conditions given in IEC 62052-1 1 :2020, 7.1 apply.
When the current is held constant as specified in Table 5, 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 for the relevant class indexes given in Table 5.
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 5 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 5.IEC 62053-41 pdf download.