Table of Contents

Foreword
1 Scope
2 Normative references
3 Definitions and abbreviations
  3.1 Definitions
  3.2 Abbreviations
4 Introduction
  4.1 General
  4.2 Back
5 Requirements
  5.1 Magnetic field strength level
  5.2 Linearity of the magnetic field strength
  5.3 Frequency characteristics
6 The probe coil
  6.1 Dimensions
  6.2 Calibration of probe coil
  6.3 Distortion
  6.4 Connecting leads for probe coil
7 Test procedures
  7.1 Calibration of receive sound pressure level
  7.2 Measurement of the magnetic field strength level
  7.3 Measurement of the linearity of the magnetic
      field strength
  7.4 Measurement of frequency characteristics
Annex A (normative): Packaging, labelling and user
        instructions
  A.1 Packaging and labelling
  A.2 User instructions
Annex B (informative): Step-by-step measurement
        procedures
Annex C (informative): Symbol indicating facilities for
        the hearing impaired
Annex D (informative): Typical characteristics of probe
        coil
Annex E (normative): Calibration of the probe coil
Annex F (informative): Components of the inductive
        field
Annex G (informative): Bibliography
History

Abstract

Defines characteristics and related methods of testing for a magnetic field generated by telephone terminals for coupling to hearing aids with magnetic pick-up coils. Applies to both analogue and digital telephony terminals.

General Product Information

Published
Document Type	Standard
Status	Current
Publisher	European Telecommunications Standards Institute
Pages
ISBN
Committee	TE 4
Supersedes	PRETS 300 381 : NOV 93