SN EN 61027 : 1993

Cooperating organizations<br>National foreword<br>Foreword<br>Introduction<br>1. Scope<br>2. Object<br>3. Definitions<br>4. Characteristics to be specified by the manufacturer<br>5. specifications for aural impedance/admittance <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Snstruments<br>6. Methods of test of performance<br>7. Calibration cavities<br>8. General requirements<br>9. Symbols, forms and formats for acoustic impedance/<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;admittance data<br>Annex A - Recommended units and terms<br>Annex ZA - (normative) Other international publications<br>quoted in this standard with the references of the <br>relevant European publications<br>National annex NA (informative) Committees responsible <br>National annex NB (informative) Cross-references

Ensures that measurements made under comparable test conditions with different instruments complying with the standard will be consistent. Covers instruments designed primarily for the measurement of modulus of acoustic impedance/admittance in the human external acoustic meatus using a 226 Hz probe tone. Lays down performance specifications for four types of instrument, defines the characteristics to be specified by the manufacturer and specifies the facilities to be provided on three of these types.