NBN EN 60514 : 1995

Committees responsible
National foreword
Foreword
1. Scope
2. General remarks
3. Units
4. Definitions
5. Acceptance conditions for batches
6. Place of inspection
7. Test conditions
7.1 Reference conditions
7.2 Uncertainty of measurement
7.3 Cover and seal
8. Inspection and test procedure
8.1 Preliminary tests and pre-conditioning
8.2 Test No.1: dielectric properties
8.3 Test No.2: running with no-load
8.4 Test No.3: starting
8.5 Test Nos.4 to 9: accuracy
8.6 Test No.10: verification of meter constant
8.7 Test No.11: mechanical inspection
9. Requirements corresponding to different inspection
     procedures
9.1 100% inspection
9.2 Sampling inspection
Tables
I. Reference conditions
II. Test points and limits of errors
III. Acceptance number c
IV. Random numbers
V. Sampling plans
VI. Double sampling plan
VII. Specified values for the standard deviation method
VIII. Specified values for the average range method
IXa. Operating characteristic curves NIXb. Operating characteristic curves 101IXc. Operating characteristic curves 501X. Inspection sheet
XIa. Acceptance trapezium, T = 3.5%
XIb. Acceptance trapezium, T = 3.0%
XIc. Acceptance trapezium, T = 2.5%
Appendix A - Explanatory notes concerning sampling
      procedures for Class 2 watthour meters
Appendix B - Symbols

Deals with methods and procedures that apply to newly manufactured direct connected induction type watthour meters of Class 2. Proposes with two methods of acceptance inspection: sampling inspection and 100% inspection. Describes two methods of sampling inspection: inspection by variables and inspection by attributes.