1 Scope <br>2 Normative references<br>3 Terms and definitions<br>4 Limitations<br>5 Conditions for test environment<br> 5.1 Environmental conditions<br> 5.2 Ambient background noise<br> 5.3 Acoustical properties<br> 5.4 Sound field characteristics<br>6 Preparation of subject<br> 6.1 Otoscopic examination<br> 6.2 Position of subject<br> 6.3 Instructions to subject<br>7 Measurement procedure<br> 7.1 Equipment<br> 7.2 Calibration<br> 7.3 Equalization methods<br> 7.4 Test signal<br> 7.5 Location of the subject<br> 7.6 Location of the tester<br> 7.7 Choice of field reference point<br> 7.8 Choice of measurement point<br> 7.9 Location and coupling of the hearing aid<br> 7.10 Real-ear unaided response (REUR) curve<br> 7.11 Real-ear unaided gain (REUG) curve<br> 7.12 Real-ear occluded response (REOR) curve<br> 7.13 Real-ear occluded gain (REOG) curve<br> 7.14 Real-ear aided response (REAR) curve<br> 7.15 Real-ear aided gain (REAG) curve<br> 7.16 Real-ear insertion gain (REIG) curve<br>8 Data to be recorded<br>Annex<br>A Positioning the probe microphone sound inlet at the<br> measurement point<br>Bibliography