Scope
The stability of metrological characteristics is one important aspect of durability.
This part of IEC 62059 specifies a method for testing the stability of metrological characteristics of AC and DC electricity meters, by operating a test specimen at the upper limit of the specified operating range of temperature, voltage and current for an extended period.
This document does not apply to digital revenue meters.
Functional performance other than the accuracy of energy measurement is out of the scope of this standard.
Note, that from the results of this test, no conclusion can be drawn for the length of period during which the stability of the metrological characteristics will be maintained when the meter is operated under field conditions. This test is intended as a qualitative accelerated life test considering only the high temperature stress and must not be confused with the test of meter error shift due to influence of temperature.
Meters designed for operation with Low-Power Instrument Transformers (LPITs as defined in the IEC 61869 series) may be tested for compliance with this document and the relevant IEC 62053 series documents only if such meters and their LPITs are tested together as directly connected meters.
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