Foreword
Introduction
1 Scope
2 Normative references
3 Abbreviations
4 Electrical characteristics
4.1 Point of connection in the telephone set
4.2 Electrical characteristics at interconnection
point
4.3 Safety
5 Interconnection with the telephone set
6 Test procedures
6.1 Setting the reference drive level
6.2 Determining the electrical impedance at the
interconnection point
6.3 Measurement of the sensitivity
6.4 Determining the frequency characteristic
6.5 Determining the maximum output level
6.6 Determining the electrical noise level
6.7 Checking the input/output linearity
Annex A (normative): Packaging, labelling and user
instructions
A.1 Packaging and labelling
A.2 User instructions
A.3 Product Suppliers Information
Annex B (informative): Rationale for electrical output
sensitivity chosen
Annex C (informative): Coupling to the hearing aid
C.1 Connector position
C.2 Interconnecting lead
Annex D (informative): Bibliography
History