IEEE 1140 : 1994

Institute of Electrical & Electronics Engineers

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1 Scope
2 Definitions
3 General conditions
3.1 General
3.2 Background electric field levels
3.3 Background magnetic field (magnetic flux density)
4 Electric field test equipment
4.1 Electric field measuring probe
4.2 Probe filters and signal processing
4.3 Calibration
5 Electric field strength measurement procedure
5.1 VDT test setup
5.2 Measurement procedure
5.3 Measurement uncertainty
6 Magnetic field test equipment
6.1 Magnetic field measuring probe
6.2 Probe filters and signal processing
6.3 Calibration
7 Magnetic flux density measurement procedure
7.1 VDT test setup
7.2 Measurement procedure
7.3 Measurement uncertainty
8 Bibliography
Annexes
A (normative) Electric field measuring probe -
     principle of operation
B (normative) VDT characterization - typical data
     recording format
C (normative) Measurement uncertainty - typical data
     recording format
D (normative) Measurement instrumentation used

Abstract

Lays down methods for measuring the electric and magnetic fields in close proximity to video display terminal (VDTs) that are in the frequency range of 5 Hz to 400 kHz. This publication adapts existing international measurement technologies and practices to achieve a consistent and harmonious VDT measurement standard for testing in a laboratory controlled environment. These measurements are needed for investigative studies that rely on the knowledge of electric and magnetic field levels near electronic equipment.