AS 3720-1989

1 - AS 3720-1989 MEASUREMENT OF POWER-FREQUENCY ELECTRIC FIELDS
4 - PREFACE
5 - CONTENTS
6 - 1. Scope
6 - 2. Object
6 - 3. Defi nitions
6 - 3.1 Electric field strength
6 - 3.2 Single-phase a.c. fields
7 - 3.3 Three-phase a.c. fields
7 - 4. Field strength measuring instruments
7 - 4.1 General
8 - 4.2 Free-body meters
9 - 4.3 Ground-reference meters
9 - 4.4 Electro-optic meters
10 - 5. Calibration field and calibration check
10 - 5.1 General
11 - 5.2 Production of a uniform calibration field with parallel plates
12 - 5.3 Current-injection calibration check
13 - 6. Calibration procedure
14 - 7. Field strength measurements
14 - 7.1 General
14 - 7.2 Three-phase transmission lines
16 - 7.3 Sphere-plane configuration
17 - 7.4 Determination of proximity effects
17 - 8. Field strength measurement uncertainties
18 - APPENDIX A - PARAMETERS AFFECTING ACCURACY OF FIELD STRENGTH MEASUREMENTS
18 - A1. Handle leakage
18 - A2. Insulating support
19 - A3. Humidity
19 - A4. Temperature
20 - A5. Harmonic content
20 - A6. Ambient magnetic fields
20 - A7. Instrument inclination
21 - A8. Non-uniformity (divergence) of the field

Specifies methods for the measurement of power-frequency electric field strength in air using commonly available or commercially available instrumentation, and procedures for calibration. This Standard is technically identical with and reproduced from IEC 833:1987.

This standard is applicable to the measurement of electric field strength at power frequencies in air for quasi-uniform electric fields with instrumentationin common use and/or commercially available. The standard is applicable to other instruments provided they are calibrated according to the procedures described in this standard.