NBN EN 50470-3 : 2007

1 Scope
2 Normative references
3 Terms, definitions and abbreviations
4 Standard electrical values
5 Mechanical requirements
6 Climatic conditions
7 Electrical requirements
   7.1 Power consumption
        7.1.1 Measurement method
        7.1.2 Voltage circuits
        7.1.3 Current circuits
   7.2 AC voltage test
8 Accuracy requirements and tests
   8.1 Limits of percentage error due to variation of the load
   8.2 Repeatability
   8.3 Limits of additional percentage error due to influence
        quantities
   8.4 Maximum permissible error (MPE)
   8.5 Effect of disturbances of long duration
   8.6 Short time overcurrents
   8.7 Performing the tests
        8.7.1 Accuracy test conditions
        8.7.2 Accuracy tests at reference conditions
        8.7.3 Interpretation of accuracy test results
        8.7.4 Repeatability
        8.7.5 Test of effects of influence quantities
        8.7.6 Calculation of the composite error
        8.7.7 Test of effects of disturbances of long duration
        8.7.8 Short time overcurrents
        8.7.9 Test of starting and no-load condition
        8.7.10 Meter constant
9 Durability
10 Reliability
11 Requirements concerning the software and protection against
   corruption
   11.1 General
   11.2 Identification of functions implemented in software
   11.3 Identification and protection of software
   11.4 Identification and protection of metrologically relevant
        parameters
   11.5 Setting of parameters
   11.6 Protection of measurement data
   11.7 Protection against inadmissible influence by
        metrologically non-relevant software
   11.8 Protection against inadmissible influence by
        connecting another device
Annex A (informative) Calculation of the composite error
Annex B (normative) Test circuit diagram for the test of
                       immunity to earth fault
Annex C (normative) Test circuit diagram for d.c., even
                       harmonics, odd harmonics and sub-harmonics
Annex ZZ (informative) Coverage of Essential Requirements of
                       EC Directives
Bibliography

Applies to newly manufactured static watt-hour meters intended for residential, commercial and light industrial use, of class indexes A, B and C, for the measurement of alternating current electrical active energy in 50 Hz networks.