NBN EN 61268 : 1996

1 Scope
2 Normative references
3 Definitions
3.1 General definitions
3.2 Definitions related to the functional elements
3.3 Definitions of mechanical elements
3.4 Definitions of insulations
3.5 Definitions of meter quantities
3.6 Definitions of influence quantities
3.7 Definition of tests
4 Requirements
4.1 Standard electrical values
4.2 Mechanical requirements
4.3 Climatic conditions
4.4 Electrical requirements
4.5 Electromagnetic compatibility (EMC)
4.6 Accuracy requirements
5 Tests and test conditions
5.1 General testing procedures
5.2 Tests of mechanical requirements
5.3 Tests of climatic influences
5.4 Tests of electrical requirements
5.5 Tests for electromagnetic compatibility (EMC)
5.6 Tests for accuracy requirements
Tables
1 Standard reference voltages
2 Standard reference currents
3 Clearances and creepage distances for the terminal
      block
4 Voltage marking
5 Temperature range
6 Relative humidity
7 Voltage range
8 Variations due to short-time overcurrents
9 Variations due to self-heating
10 Percentage error limits (single-phase meters and
      polyphase meters with balanced loads)
11 Percentage error limits (polyphase meters carrying
      a single-phase load, but with balanced polyphase
      voltages applied to voltage circuits)
12 Influence quantities
13 Temperature coefficient
14 Starting current
15 A.C. voltage tests
16 Voltage and current balance
17 Reference conditions
18 Interpretation of test results
Annexes
A Relationship between ambient air temperature and
      relative humidity
B Test circuit diagram for d.c. influence test
C Voltage waveform for the tests of the effect of
      voltage dips and short interruptions
D Electromagnet for testing the influence of
      externally produced magnetic fields
E Geometric representation of active and reactive
      power
F Test schedule
ZA (normative) Normative references to international
      publications with their corresponding European
      publications
ZB (normative) Special national conditions