I.S. EN 60687:1993

Cooperating organizations
National foreword
Foreword
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 of accuracy requirements
Annexes
A. Relationship between ambient air temperature and
     relative humidity
B. Voltage wave-form for the tests of the effect of
     voltage dips and short interruptions
C. Electromagnet for testing the influence of
     externally-produced magnetic fields
D. Test schedule
ZA. Special national conditions
ZB. Other international publications quoted in this
     standard with the references of the relevant
     European publications
Tables
1. Standard reference voltages
2. Clearances and creepage distances for the terminal
     block
3. Voltage marking
4. Temperature range
5. Relative humidity
6. Power consumption including the power supply
7. Voltage range
8. Variations due to self-heating
9. Percentage error limits (single-phase meters and
     polyphase meters with balanced loads)
10. Percentage error limits (polyphase meters carrying
     a single-phase load, but with balanced polyphase
     voltages applied to voltage circuits)
11. Influence quantities
12. Temperature coefficient
13. AC voltage tests
14. Voltage and current balance
15. Reference conditions
16. Interpretation of test results
National annex NA (informative) Committees responsible
National annex NB (informative) Cross-references

Describes type tests and lays down standard requirements for newly manufactured transformer operated static watt-hour meters of accuracy Classes 0.2 S and 0.5 S for the measurement of a.c. electrical active energy of a frequency within the range 45 Hz to 65 Hz.