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IEEE 1027 1984

$22.75

Draft Trial-Use Standard Method for Measuring the Magnetic Field Intensity Around a Telephone Receiver

Published By Publication Date Number of Pages
IEEE 1984 14
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New IEEE Standard – Inactive – Superseded. A practical method for determining the magnetic-field characteristics of a telephone receiver by means of objective measurements in a test connection is described. The method was developed in response to a need to specify the magnetic field at selected locations around a telephone receiver, required for satisfactory coupling of hearing aids. However, the method is sufficiently general to allow complete mapping of the magnetic field. It is also useful for other applications where knowledge of the magnetic field intensity is required.

PDF Catalog

PDF Pages PDF Title
7 1 Introduction
2 ScopeandPurpose
3 Definitions
4 Test Equipment
4.1 Probecoils
Fig 1 Reference Plane
8 4.2 Integrator
4.3 Variable Frequency Oscillator
4.4 ACVoltmeter
4.5 Level Recorder
4.6 StandardTest Circuit
Fig 2 Air Core Probe Coil
Fig 3 Probe Coil with Magnetic Material Core
Fig4 Test Circuit
9 4.7 BandpassFilter
5 System Calibration
5.1 Sensitivity
5.2 Frequency Response
5.3 Linearity
5.4 Signal to Noise Ratio
(a) Transformer Type Feed Circuit (b) Relay Coil Type Feed Circuit
10 6 Testprocedure
6.1 General
6.2 Conditioning
6.3 Receiver Acoustic Termination
6.4 Measurement of Magnetic Field Magnitude and Direction
6.5 FrequencyResponse
11 6.6 Distortion
6.7 Test Conditions
12 Appendix A Integrator
13 Coil Output Voltage Derivation
Generation of a Known Magnetic Field Using Helmholz Coils
14 FigC1 HelmholzCoils
IEEE 1027 1984
$22.75