INTRODUCTION
1 Scope
2 Normative references
3 Definitions
4 Standard sphere-gap
4.1 Requirements on shape and surface conditions
4.2 General arrangement of a sphere-gap for measurement
4.3 Connections
5 Use of the sphere-gap
5.1 Condition of the sphere surfaces
5.2 Irradiation
5.3 Voltage measurements
6 Reference values in tables 2 and 3
6.1 Accuracy of values in tables 2 and 3
6.2 Air density correction factor
6.3 Humidity correction factor
7 Standard rod-rod gap for measurement of direct voltage
7.1 General arrangement of a rod-rod gap
7.2 Reference values
7.3 Measurement procedure
8 Use of standard air gaps for performance checks of
approved measuring systems
Annex A (informative) Range of experimental calibrations
for sphere-gaps
Annex B (informative) Procedure by which the values in
tables 2 and 3 have been derived from national
standards and other sources
Annex C (informative) Sources of irradiation
Annex D (informative) Uncertainty and calibration of
sphere-gaps
Annex ZA (normative) Normative references to international
publications with their corresponding European
publications
Bibliography
Figures
Tables